DO THE TON

Blood Sweat Tears and Grease => Projects => Specials => Topic started by: Hurco550 on Jul 26, 2015, 20:42:25

Title: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 26, 2015, 20:42:25
I live in a rural sub division (I know, doesn't make much sense) but I guess that's how they do it here in Ohio. It's literally about 5 miles north of "town" surrounded by fields. Anyways between my location and going to events like mid ohio, I decided that I needed a pit bike to cruise the side streets and around events. I started looking around craigslist, but being a cheapy, nothing fit the bill.

I then remembered an old rupp mini bike frame that used to be out at dad's place. Sure enough it was still there and I snagged it today. It used to belong to a buddy of my dad's back when he was a kid, and by the looks of it, it was treated like a kid treats a mini bike. There isn't much left, pretty much just the frame and wheels, even less the front brakes. Between the overall rough shape of the bike and the relative lack of value of it in this shape (comparable specimens on eBay for less than $200) I don't feel bad about doing a bit of customization. Rupps were actually made about a half hour from here in mansfield ohio, so there are quite a few around.

The plan is some different wheels and non nobby tires, maybe a little custom suspension work, and a 6.5hp harbor freight special engine. And of course some clubman bars and a "cafe seat" lol I'm really gonna try to tick off the purists on this one =)

Here's the obligatory "barn fresh" pic
(http://images.tapatalk-cdn.com/15/07/26/0dcead25a219cd86d49e9273bc80114f.jpg)

And after a quick spray off, which may have actually made it look worse haha
(http://images.tapatalk-cdn.com/15/07/26/5f77cb3e82bbf070a2371667a3e2f526.jpg)

And here is why I'm not gonna be using these wheels
(http://images.tapatalk-cdn.com/15/07/26/ea95e0dfc9ae45ac008836214129c2d7.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jul 27, 2015, 22:29:43
Went to Glens surplus in Shelby and picked up some wheels. Need to make some axles up as the stock ones are 1/2" and the bearings in the new wheels are 5/8". Also stuck on some old clubman which will get narrowed up and some old shocks I had around, which lower the rear about 2"

(http://images.tapatalk-cdn.com/15/07/27/f27a6fb222278961e1be012a733e9b7a.jpg)

(http://images.tapatalk-cdn.com/15/07/27/d0155a7373e53c4b7386dbc1cca3698b.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jul 29, 2015, 00:41:26
Got tired of the old turd falling over, so I used my mad wood working skills to make a sweet kick stand.
(http://images.tapatalk-cdn.com/15/07/28/55396a48a79ada8c18fcece5311c0a10.jpg)

(http://images.tapatalk-cdn.com/15/07/28/0beb4c585f4cc0847889d87fc0f5e594.jpg)

I had an old briggs 2 horse motor laying around that I stuck on it.
(http://images.tapatalk-cdn.com/15/07/28/ec0befe5e58c43d40c099ee6de5e02ad.jpg)

(http://images.tapatalk-cdn.com/15/07/28/7c96316379125579ea0a40966b6796cc.jpg)

After some tinkering I realized that I don't have spark. I looked up what a coil, condenser and points would cost. It was gonna be around 30-40 bux to my door.  I then started cruising craigslist and found this running 3 horse briggs fir $40 about 10 minutes from home, so I snagged it tonight.
(http://images.tapatalk-cdn.com/15/07/28/49582118d3260a933cb189ec23a91f68.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jul 29, 2015, 13:42:57
BALLS. Just realized i bought a tecumseh.... on ebay she goes. Might end up with a harbor freight motor after all....
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 01, 2015, 11:31:38
So I picked up a harbor freight motor. With the coupons, I got er for just over a bill. 212 cc 6.5 hp. should be enough to motivate this little booger
(http://images.tapatalk-cdn.com/15/08/01/47f618152187b0073e7ad7e4ac58312f.jpg)
(http://images.tapatalk-cdn.com/15/08/01/aaa0a54c88fadaa1c646f2500d451632.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Drey6 on Aug 01, 2015, 12:05:44
Woot woot! Digging the wheels
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: grcamna5 on Aug 02, 2015, 22:43:08
I like those wheels hurco;what are you going to use for brakes ?
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 02, 2015, 22:48:11
Thanks gentlemen. Debating on brakes right now. Either drums or mechanical caliper discs. Probably gonna stay away from juice
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Drey6 on Aug 03, 2015, 02:19:44

Thanks gentlemen. Debating on brakes right now. Either drums or mechanical caliper discs. Probably gonna stay away from juice

Wise.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 06, 2015, 01:11:55
Well.. we all know how projects go. . The frame ended up being rusted, bent, threads stripped, bearing surfaces wallowed ect. So I snagged another frame up in Shelby off the bay for $30
(http://images.tapatalk-cdn.com/15/08/05/085570b17f1e085dbb90c7893d378a55.jpg)

Got my torque converter in the mail today. It's a much cheaper copy of the popular comet tav2.
(http://images.tapatalk-cdn.com/15/08/05/47193f22a324de8a7fd7fa1005245d0f.jpg)

But then when mounting it up, it shows just how bad it really is out of square even my "new" frame is. That on top of clearance issues it making me somewhat re think the ol rupp frame
(http://images.tapatalk-cdn.com/15/08/05/4cf0bb73a78ea0c9c81d1745e6933834.jpg)
(http://images.tapatalk-cdn.com/15/08/05/eac589cefc18a39b43e3db6df4218058.jpg)
(http://images.tapatalk-cdn.com/15/08/05/23b34892eb2ee17b4f7f3d517d326978.jpg)

So, I started drawing. I am kinda diggin this. The frame would be water jet cut from .187" steel and be two identical pieces that sandwich tabbed gussets all around the outside. The wheelbase is about the same as the rupp and the wheels are 17.5" fir a bit of scale.
(http://images.tapatalk-cdn.com/15/08/05/302439d94d62c4530a4b0a694e9e494a.jpg)
(http://images.tapatalk-cdn.com/15/08/05/6382ed47554a51ee4993d1776494d071.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Brodie on Aug 06, 2015, 02:44:15
Dude, I'm in. Looks like an awesome project.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: 1fasgsxr on Aug 06, 2015, 12:51:45
Looking good man...If I am not mistaken if thats a "predator" engine they make a ton of hop up goodies for it... I was looking into one for my drift trike I never finished...lol
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 06, 2015, 13:24:40
Thanks gentlemen! The 212 is a pretty much direct copy or clone of a Honda. China jumped on it when Hondas patents ran out I guess. There is a huge aftermarket for them, billet con rod, billet fly wheel, billet piston, slide carb ect. My goal though is to leave it stock (at this point) to keep it as "dependable" as a Chinese engine can be. I think even stock, it will motivate this little booger along fast enough to be stupid for what it is lol I too had the "start" to a drift trike at one point. I gave up on that before I even started doing any fab work though lol
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: 1fasgsxr on Aug 06, 2015, 13:36:36
all i really need to finish my trike is tires and the pvc pieces to go over them and assemble the front wheel...just lost interest..lol
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Aug 06, 2015, 17:28:38
Signing on....I've got a son, and a second kid on the way.  I think law dictates that I must build at least ONE for them, and several for me correct?  This looks awesome.  Great work so far!
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 06, 2015, 22:27:29
Bruno, I'm pretty sure that it is a requirement =) if this thing actually gets completed, I'll send the flat cut files to ya. If you found a waterjet or laser shop, you would be a weld shop, a harbor freight engine and some wheels (more or less) away from a neat little ride haha.

I got the design finished up. I'm gonna have my water jet guy (dad) cut my first attempt out of 3/16" thick ply wood and just arc weld it together with wet dowel rods. Then I will make changes as necessary before committing to steel lol

I drew up the wheels to get a bit better idea of the finished look, and I think I can dig it. I am already guessing that this thing will be painful to ride, but it will look cool and that's all that matters in any bike (or at least that's what I heard from xb33bsa) lol

Wheels n parts drawn up
(http://images.tapatalk-cdn.com/15/08/06/dc4a93e84021ced488e6bb3a5dfdcb43.jpg)

All the "slots" between the speed holes are where my gussets will go. The way I have stuff tabbed, this thing should be largely self fixturing
(http://images.tapatalk-cdn.com/15/08/06/61910406606982ffdff429c89151ebdf.jpg)

Here are what the gussets will look like that will space the frame halves apart
(http://images.tapatalk-cdn.com/15/08/06/8d18867162949102f0ceec80718df848.jpg)

And here is what it should look like more or less one welded and ground
(http://images.tapatalk-cdn.com/15/08/06/cae9210919a503da1d1f8d965a36cef9.jpg)

I left room for the stock gas tank, airbox and muffler, but eventually I will hopefully make all those things and get rid of the plastic stuff
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Brodie on Aug 06, 2015, 22:37:15
Yep, have to build one if you have a kid. Tis law. If they are anything like me they will still have it at 24.

Good looking frame design. Are you going to stick a rear shock in there or just run hard tail?

Also, beware big engines in small bikes. Nothing to get the heart pumping like hitting a pot hole at 70mph with 8 inch tyres.

Sent from my ASUS_Z00AD using Tapatalk

Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 06, 2015, 23:02:34
Ha, no plans for a suspension at this point, just the jelly between the vertibrae in my back =)

I am hoping that my math is right and I end up with a max speed of around 40 mph with a 72 tooth rear sprocket. That will be plenty fast for this booger
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Aug 07, 2015, 11:53:39
Bruno, I'm pretty sure that it is a requirement =) if this thing actually gets completed, I'll send the flat cut files to ya. If you found a waterjet or laser shop, you would be a weld shop, a harbor freight engine and some wheels (more or less) away from a neat little ride haha.

Awesome.  Maybe I'd even throw ya some paypal money for your efforts :)     My dad knows a waterjet guy, I can weld fairly well now and there's a harbor freight 10 miles from me!  Sounds like this will have to happen.  Now I may have to sell a bike to fund the project...the second rule is one bike out = one bike in without any naysaying from the wife.  (she rides so this rule works quite well)

I'm planning on a fleet for the kids though...so maybe the rule will change to 1 large bike out, 3 mini bikes in?  We'll see  ;)

I may modify mine with cheap chinese scooter suspension though...I feel old at 30 already...

Keep at it!
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 13, 2015, 23:30:48
My dad got the wood mock up cut
(http://images.tapatalk-cdn.com/15/08/13/cb65a9b8682b07792fc44e9585e9cc27.jpg)

I started assembling the pieces and gluing them together
(http://images.tapatalk-cdn.com/15/08/13/0306ed136bb2acecb1aa2de38a2484bf.jpg)

(http://images.tapatalk-cdn.com/15/08/13/7d1bf8b5431b8c586f25784f606ff8aa.jpg)

(http://images.tapatalk-cdn.com/15/08/13/69891b9858429039850f65ef9c26611b.jpg)

(http://images.tapatalk-cdn.com/15/08/13/4bc07022e5f0822dac76335c900459fa.jpg)

(http://images.tapatalk-cdn.com/15/08/13/23baf59497d926390ea8ab8be385d850.jpg)

Gotta love my "custom" brick wood clamps
(http://images.tapatalk-cdn.com/15/08/13/9e868e68096fba8ec2cb84407b6bc393.jpg)

Kinda assembled
(http://images.tapatalk-cdn.com/15/08/13/346fb8a4aaabfab83de4bcac2f7c4a2a.jpg)

(http://images.tapatalk-cdn.com/15/08/13/91402efc6db2bc15168b8b4658b70cab.jpg)

(http://images.tapatalk-cdn.com/15/08/13/6926b121c2406ebccf57ec7d2dfead1b.jpg)

I am glad I did it in wood, as I have a few changes to make, but they are minute. I an going to go a bit different on the rear end to make it a bit less bulky looking. All in all, I'm pretty happy with it
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: JustinLonghorn on Aug 14, 2015, 09:02:19
Rad.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Aug 14, 2015, 10:48:37
Rad.

I will add to this^    This thing is all sorts of Rad.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Aug 15, 2015, 23:52:22
Thanks gentlemen. I got my eBay special rear brake-sprocket combo. I have to do a bit of machining to get it lined up, but no biggie there. We will see how she stops, but if it's not up to snuff, I'll put a brake up front too
(http://images.tapatalk-cdn.com/15/08/15/6897393a04b23ef7b24cb0b035229960.jpg)
(http://images.tapatalk-cdn.com/15/08/15/987cb561f0978ca9526088c23a51f1da.jpg)

This wood frame is gonna be a neat piece of wall art when all is said and done
(http://images.tapatalk-cdn.com/15/08/15/0044ec570470a8e5691cec119cfc2c72.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Sep 07, 2015, 18:24:27
It's good to have buddies with machine shops. Got the rear drum/sprocket machined. I had to add a few bolt holes as well as open up the center hole to fit the rim.
(http://images.tapatalk-cdn.com/15/09/07/b89533a0eeda4fc0ca9cd67747548179.jpg)

(http://images.tapatalk-cdn.com/15/09/07/626bd73742bf53d46170039f914b5f9e.jpg)

(http://images.tapatalk-cdn.com/15/09/07/835b820ac17c31e9f76754ea7789fdde.jpg)

(http://images.tapatalk-cdn.com/15/09/07/211414739d1c7b1a106d38211b195429.jpg)

Still not sure on the frame. Had this old frame sitting around too, and I'm diggin the look
(http://images.tapatalk-cdn.com/15/09/07/9ef21d1c890d6055b8e2ce24d06606dd.jpg)

The aluminum frame like the wood mockup would be sweet, I just have a ton of projects.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Sep 08, 2015, 12:14:46
That is pretty cool.  I dig the tires :)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Sep 08, 2015, 12:19:52
That is pretty cool.  I dig the tires :)
Thanks man!  I wish they made Firestone champion deluxe in that size lol
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Sep 08, 2015, 12:59:28
Thanks man!  I wish they made Firestone champion deluxe in that size lol

Haha. Maybe you can petition for it once we all start building these bad boys!  8)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: irk miller on Sep 08, 2015, 13:06:32
This is a really awesome build.  I want that wood mockup. 
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Sep 08, 2015, 13:19:34
Haha. Maybe you can petition for it once we all start building these bad boys!  8)

haha I just want the increased performance that champion deluxe tires have to offer =P
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Sep 08, 2015, 13:20:52
This is a really awesome build.  I want that wood mockup.

Thanks man =) I don't know what it will actually look like in the end, but I hope it turns out neat one way or the other. The wood mockup is destined to be wall art im afraid, but if that ever changes, ill let ya know =)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: ridesolo on Sep 12, 2015, 22:31:05
Lookin' nice.  I wondered how much I was going to have to open up my brake hubs so they'll fit onto the wheels.  Will have to do it X2 as I'll be putting the front brake back on... still toying w/ the idea of doing a front disc, though.  They've got a nice little caliper over at Glenn's that's about right or I know there'd be one from the front of a smaller 4-wheeler available on eBay. 

What size sprocket do you have on the jack shaft?  Mine's got a 10 tooth, thinking about maybe changing to a 12 or maybe even 14 tooth.  I figure that little 4hp Tecumseh should be ok after the rebuild, but it's 45 years old and maybe if it's geared a little higher riders won't feel the need to have the thing running at such high RPMs... (yeah right!) 
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Sep 14, 2015, 10:21:02
Lookin' nice.  I wondered how much I was going to have to open up my brake hubs so they'll fit onto the wheels.  Will have to do it X2 as I'll be putting the front brake back on... still toying w/ the idea of doing a front disc, though.  They've got a nice little caliper over at Glenn's that's about right or I know there'd be one from the front of a smaller 4-wheeler available on eBay. 

What size sprocket do you have on the jack shaft?  Mine's got a 10 tooth, thinking about maybe changing to a 12 or maybe even 14 tooth.  I figure that little 4hp Tecumseh should be ok after the rebuild, but it's 45 years old and maybe if it's geared a little higher riders won't feel the need to have the thing running at such high RPMs... (yeah right!) 


I think I could assist in opening those up if you need, and there will also likely need to be more mounting holes added to fit your new wheels (of course you could get lucky and they be the same =)

I will have to count the teeth. Mine is set up for a 35 chain and I believe yours is a 40, so it wont be the same regardless. Mine did come with a 40 sprocket for the front too, and ill count and let you know. I may waterjet a #40 sprocket for the back to have a little stiffer setup =)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: ridesolo on Sep 14, 2015, 16:30:41
I think I could assist in opening those up if you need, and there will also likely need to be more mounting holes added to fit your new wheels (of course you could get lucky and they be the same =)

I will have to count the teeth. Mine is set up for a 35 chain and I believe yours is a 40, so it wont be the same regardless. Mine did come with a 40 sprocket for the front too, and ill count and let you know. I may waterjet a #40 sprocket for the back to have a little stiffer setup =) 

The difference may be in the year because I just took the front wheel off and the brake drum off it and that drum just slides right onto the new wheel, pretty as you please.  I will have to put new holes into the drums to match up w/ the holes in the wheels, but that shouldn't be too difficult.

I was talking about the number of teeth on the front sprocket.  It looks like the thing has #35 chain but maybe I'm wrong.  The '70 was sort of an odd duck;  it has the new frame style but had 10" wheels so maybe they went to different chain when they went to the 12" wheel.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Sep 16, 2015, 10:07:14
The difference may be in the year because I just took the front wheel off and the brake drum off it and that drum just slides right onto the new wheel, pretty as you please.  I will have to put new holes into the drums to match up w/ the holes in the wheels, but that shouldn't be too difficult.

I was talking about the number of teeth on the front sprocket.  It looks like the thing has #35 chain but maybe I'm wrong.  The '70 was sort of an odd duck;  it has the new frame style but had 10" wheels so maybe they went to different chain when they went to the 12" wheel.


sounds like you lucked out. The rear sprocket and drum that I got was some NOS manx cat or something like that, so I knew the odds of it fitting were slim lol

I was looking at yours when I was there the other day, and im pretty sure that your chain is heavier than a 35. I have a chunk of 35 sitting here if you wanna compare =)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 18, 2016, 14:13:23
So this now could have been 3 separate build threads, but oh well. Found a $75 complete mini bike on cl. Couldn't pass it up. Got it home, and after a few laps around the yard, my wife decided that I had bought her a new mini bike. Truth be told, seeing her on two wheels made me smile pretty hard, so it's hers now lol.
(http://images.tapatalk-cdn.com/16/01/18/9f04630c041f6f7b5b4625233962a881.jpg)

Didn't take me long to figure out that 2 h.p. isn't enough, so 6.5 should do the trick
(http://images.tapatalk-cdn.com/16/01/18/a48079b31bc9173f8b4b8ab141a33258.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: canyoncarver on Jan 18, 2016, 14:59:37
Big yes!!!
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: irk miller on Jan 18, 2016, 15:43:02
Nice
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: ridesolo on Jan 18, 2016, 17:47:17
That looks like a good one.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Jan 18, 2016, 18:18:25
So this now could have been 3 separate build threads, but oh well. Found a $75 complete mini bike on cl. Couldn't pass it up. Got it home, and after a few laps around the yard, my wife decided that I had bought her a new mini bike. Truth be told, seeing her on two wheels made me smile pretty hard, so it's hers now lol.
(http://images.tapatalk-cdn.com/16/01/18/9f04630c041f6f7b5b4625233962a881.jpg)

Didn't take me long to figure out that 2 h.p. isn't enough, so 6.5 should do the trick
(http://images.tapatalk-cdn.com/16/01/18/a48079b31bc9173f8b4b8ab141a33258.jpg)

That a boy! She looks quite happy on it! Nice score!
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 18, 2016, 20:29:38
https://youtu.be/4JWm4TlylXw
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 18, 2016, 20:30:42
Not used to working on brand new stuff lol
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: grcamna5 on Jan 18, 2016, 20:45:23
That little engine might make a good trolling motor if you rubber mount it in your boat..
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 20, 2016, 21:16:06
Wired in the kill switch. That's about the extent of my electrical ability lol
(http://images.tapatalk-cdn.com/16/01/20/58c3edfb1f9a1b8f254df6d8bcf3b8be.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 22, 2016, 20:46:15
Clutch came in today.
(http://images.tapatalk-cdn.com/16/01/22/789111ee135c27973ee7b69e8c1334df.jpg)

My ocd forced me to draw an Autocad template to lay out the new engine mount holes. Had to move about 5/8" to line up the sprockets.
(http://images.tapatalk-cdn.com/16/01/22/26452203393ae74167d5d51970d2aef8.jpg)

(http://images.tapatalk-cdn.com/16/01/22/45356e89e94289f0c4bb4751468e6699.jpg)

(http://images.tapatalk-cdn.com/16/01/22/d032188ba14dce7acd8af8961e220dfd.jpg)

Fired her up, and the first hard Crack of the throttle ended up with me sliding off the seat and ghost riding the mini bike across the yard. More torque than I was expecting lol. Pretty wicked little thing.

(http://images.tapatalk-cdn.com/16/01/22/e60a65a5905b548fff7693ff66387338.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: irk miller on Jan 22, 2016, 21:09:26
You realize I'm starting to pay attention to these things, right? LOL
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 22, 2016, 21:10:19
You realize I'm starting to pay attention to these things, right? LOL
I'm not following lol what things
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: irk miller on Jan 22, 2016, 21:13:51
These types of bikes on CL.  Been looking for a pit bike and a small 50cc for the girls for a while, but now I'm actually paying attention to the ads for these.  Looks like a hoot.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 22, 2016, 21:16:05
It's a blast dude. Picked it up for $70. Harbor freight motor on sale for $80 and a $20 clutch. It's too much fun for 170 bones
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: ridesolo on Jan 22, 2016, 21:21:07
It's a blast dude. Picked it up for $70. Harbor freight motor on sale for $80 and a $20 clutch. It's too much fun for 170 bones 


Plus, having his non-motorcycle enthusiast Mrs, enjoy it can't hurt either.   ;D
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 22, 2016, 21:23:15

Plus, having his non-motorcycle enthusiast Mrs, enjoy it can't hurt either.   ;D
Ha, I am thinking a may be able to work her up to a Vespa from here
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: ridesolo on Jan 22, 2016, 21:25:51
Ha, I am thinking a may be able to work her up to a Vespa from here 


Crafty devil!
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 23, 2016, 13:27:13
Well, to harbor freight I go to get a 3 horse motor. First trip around the yard and it ended up out from under Cassy. She didn't think it was as funny as I did lol. (She didn't get hurt btw)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Jan 23, 2016, 13:46:00
Well, to harbor freight I go to get a 3 horse motor. First trip around the yard and it ended up out from under Cassy. She didn't think it was as funny as I did lol. (She didn't get hurt btw)

You could always just limit the throttle cable?  Cheaper/easier eh?
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 23, 2016, 14:13:25
You could always just limit the throttle cable?  Cheaper/easier eh?
Shush up man, I need this 6 horse for my mini bike lol so I'd need to get another engine anyways =) she is convinced that another engine is the only way haha
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 23, 2016, 16:14:47
https://vimeo.com/152832827 (https://vimeo.com/152832827)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 23, 2016, 16:21:08
https://vimeo.com/152833250 (https://vimeo.com/152833250)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: grcamna5 on Jan 23, 2016, 18:02:11
Small cycles are cool  ;D
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 27, 2016, 22:57:29
Took the mini bike for a spin this afternoon, and a crotchety old guy down the road felt he needed to yell at me for riding it on the road. That's when I decided to be "that guy" in the neighborhood that makes a strait pipe for it so he really knows when I'm out and about lol

I did make a flange to bolt it on so I can put the stock one back on if I have to
(http://images.tapatalk-cdn.com/16/01/27/ebaaf9ea73f8b6846a35d2c542e5aca4.jpg)

https://youtu.be/F3Z4HTgqglE
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Jan 28, 2016, 12:41:10
Took the mini bike for a spin this afternoon, and a crotchety old guy down the road felt he needed to yell at me for riding it on the road. That's when I decided to be "that guy" in the neighborhood that makes a strait pipe for it so he really knows when I'm out and about lol

I did make a flange to bolt it on so I can put the stock one back on if I have to
(http://images.tapatalk-cdn.com/16/01/27/ebaaf9ea73f8b6846a35d2c542e5aca4.jpg)

https://youtu.be/F3Z4HTgqglE

I think crotchety old guys must be people who never were able to get a motorcycle as a kid...
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: JustinLonghorn on Jan 28, 2016, 12:46:39
Yep.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: 1fasgsxr on Jan 28, 2016, 13:09:40
yup...they didnt have cool enough parents to let them have fun..I would be sure to ride by his house often !!
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: grcamna5 on Jan 28, 2016, 13:31:00
yup...they didnt have cool enough parents to let them have fun..I would be sure to ride by his house often !!

Pull-up to him w/ a smile next time and ask if he'd like to take it for a ride..
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: DohcBikes on Jan 28, 2016, 14:07:14
Took the mini bike for a spin this afternoon, and a crotchety old guy down the road felt he needed to yell at me for riding it on the road. That's when I decided to be "that guy" in the neighborhood that makes a strait pipe for it so he really knows when I'm out and about lol
This is why I love this forum. FTW.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Jan 28, 2016, 14:54:22
Pull-up to him w/ a smile next time and ask if he'd like to take it for a ride..
Ha I'll try that lol the thing is I want being an idiot or anything about it, just putting around
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: firebane on Jan 28, 2016, 21:13:50
I boot around the neighborhood in my little 90cc pit bike and often wonder when that crotchety old man is going to scream at me. One lady stopped and stared so I pulled up and asked if she wanted to for a ride and she just chuckled.

Any of these little bikes are just silly fun and hard to NOT enjoy.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on May 22, 2016, 22:12:44
Summer is here and in off work for about 10 weeks (pretty cool being a teacher) I need to fabricate something. I'm revisiting my custom frame. I think I'll just go ahead and go for it. Picked up these forks of unknown origin at Glens surplus today. They should work well.
(http://uploads.tapatalk-cdn.com/20160522/fdb71c206ce54e884e59822abfe5a525.jpg)

I'm going to go with d.o.m. tubing for my hardtail as well. Should look less bulky than my original design.
(http://uploads.tapatalk-cdn.com/20160522/7ecce410165920d8d4ffcb3f5a66ff62.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on May 27, 2016, 22:07:45
Not a huge update, but I spent some time on the lathe today and made up a neck tube to run tapered bearings.
(http://uploads.tapatalk-cdn.com/20160527/e71bee96a467bb5c133b7aa30bc9a93e.jpg)
(http://uploads.tapatalk-cdn.com/20160527/f61db88420142878f255003505027103.jpg)

Also whipped up a front axle
(http://uploads.tapatalk-cdn.com/20160527/be1032c822b74dd9101f7a343f3d432f.jpg)
(http://uploads.tapatalk-cdn.com/20160527/d77a128b3c169433b38e6517c34ef469.jpg)
(http://uploads.tapatalk-cdn.com/20160527/955c51e28b61384b0c3a531a2dc9d2f0.jpg)

Finishing up some cad drawings so I can get the parts waterjet cut here soon and keep this thing going
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on May 31, 2016, 21:40:52
Did I mention I hate you. This makes me want to spend money on a little bugger. But I can't "whip" up parts on my lathe...I'm too impatient and make ugly things on the lathe.  ::)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: JSJamboree on Sep 01, 2016, 14:45:25
Whatever happened with that wood frame minibike project? I need more of that in my life.  I love my rupp and its scary as shit going 55 with a beefed of predator.  So much power in those motors.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Sep 01, 2016, 14:48:51
Whatever happened with that wood frame minibike project? I need more of that in my life.  I love my rupp and its scary as shit going 55 with a beefed of predator.  So much power in those motors.
That will eventually be aluminum plate framed. It got back burnered for my rd350 project. Funny how they suck the life right out of all the other projects ha I have a feeling you know what I'm talking about
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: JSJamboree on Sep 01, 2016, 14:57:49
That will eventually be aluminum plate framed. It got back burnered for my rd350 project. Funny how they suck the life right out of all the other projects ha I have a feeling you know what I'm talking about

I assumed as much on both accounts, but.. I need more of that
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 02, 2016, 15:12:23
I've been messing with getting the drawings finalized so I can get some parts waterjet cut here soon. This is more or less how it will end up.

(http://uploads.tapatalk-cdn.com/20161102/d889fc40b112b762be7f274014c8a931.jpg)
 
Misc gussets and such. This is what will actually be cut. (There will be multiples of some parts)
(http://uploads.tapatalk-cdn.com/20161102/7be6fef646b4ac8bfdf79080924e8722.jpg)

Also, found these at a surplus place not far from home real cheap. They are from a Baja mini bike. I guess I'm gonna have juice brakes after all.
(http://uploads.tapatalk-cdn.com/20161102/7605097e0aa1953296d0f575522ffe46.jpg)
(http://uploads.tapatalk-cdn.com/20161102/8d0b6230b8238a9113623aa686e0cee5.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: focusinprogress on Nov 02, 2016, 15:28:29
I'm def interested to see what the final mini bike looks like, this is rad.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Maritime on Nov 02, 2016, 15:28:49
Ha, how have I not been getting updates on this.  nice.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Nov 03, 2016, 11:12:30
I love this project :)  MOAR UPDATES!!!!  Not that you don't have any other motorbikes to work on.....heh. 
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 03, 2016, 11:53:35
I love this project :)  MOAR UPDATES!!!!  Not that you don't have any other motorbikes to work on.....heh.
Only one little update. Rear end tubing bent up. 1" d.o.m.  .125" wall.
(http://uploads.tapatalk-cdn.com/20161103/a1b1475b1e5ecb74669948733a9bbb51.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: irk miller on Nov 03, 2016, 13:22:00
DOM, whoah.  This is destined for speed trials.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 03, 2016, 13:27:30
DOM, whoah.  This is destined for speed trials.

I really may see how it turns out, but I may throw a plate on it and see if she makes it from jenn and e's to Hendersonville this spring. I don't think with the right gearing 55 mph will be out of reach ;)

also, we just happened to have some DOM laying around, so that's what it be...
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: irk miller on Nov 03, 2016, 14:49:19
I may throw a plate on it and see if she makes it from jenn and e's to Hendersonville this spring.

Please make this happen. I want to be in on that ride.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 03, 2016, 15:24:35
Please make this happen. I want to be in on that ride.

ha, we will need a "slow group", especially in the mountains. Hopefully the cops would turn a lot of blind eyes as far as that goes
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Nov 03, 2016, 16:00:11
ha, we will need a "slow group", especially in the mountains. Hopefully the cops would turn a lot of blind eyes as far as that goes

Ride in the center of the pack, make no eye contact..... ;)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: ridesolo on Nov 03, 2016, 16:29:29
Ride in the center of the pack, make no eye contact..... ;) 

Yup, and to make sure you aren't noticed dress up as a "Creepy Clown" and equip the bike w/ a loud ah-ooh-gah horn.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 03, 2016, 19:33:33
Went to Glenn's surplus today and picked up a rotor, extra set of pads, master cylinder, caliper and line. $50 bucks for the whole deal. They are from a Baja pit bike of sorts.
(http://uploads.tapatalk-cdn.com/20161103/bef08908902beda92b3f6329f62ce142.jpg)

Gonna have to machine up an adapter mount for the rotor.
(http://uploads.tapatalk-cdn.com/20161103/d3f109934741246db5a1cf880addde0a.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: ridesolo on Nov 03, 2016, 20:41:31
Darn, when I saw those rotors in your earlier picture I noted they had four holes I was hoping they'd line up w/ the holes in the wheels and make the mounting simple for you.  At least you have the ability to design and make a pretty simple mount.  What you got looks great.  I can't tell you the number of times I've looked at those various bits n pieces over at Glen's and thought there ought to be something great to hang 'em on.
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 03, 2016, 21:55:05
Ride in the center of the pack, make no eye contact..... ;)


Yup, and to make sure you aren't noticed dress up as a "Creepy Clown" and equip the bike w/ a loud ah-ooh-gah horn.

So much good advice. Thanks guys ;)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 04, 2016, 14:56:53
(http://uploads.tapatalk-cdn.com/20161104/30fe073d0419febef6002d14483d94f1.jpg)

(http://uploads.tapatalk-cdn.com/20161104/afcb5f8dc38e663056c11818201d58a3.jpg)

Well, with the caliper and rotor on hand I was able to finalize the mount setup. That's about the last of the design work before it gets sent off for water jet cutting... If all goes well I'll have some parts by next week ;)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: advCo on Nov 04, 2016, 15:14:48
Rad. Is this what you're putting that front end from Barber swap meet on?
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 04, 2016, 15:31:28
Rad. Is this what you're putting that front end from Barber swap meet on?


haha, nope... that's yet another project. The snowmobile bobber one
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: irk miller on Nov 04, 2016, 15:54:32
Just had a convo with a student's dad that has built Formula SAE cars.  He took over ownership of the Ninja 600 powered car he and students built while at Virginia Tech.  He did some mods over what they did in '91, one of which included gutting the Ninja tranny down to one gear and running that to a snowmobile CVT.  Food for thought...
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 17, 2016, 15:57:08
I've quit drawing, finalized everything for the last time, and sending it to dad to have it cut. Not sure on turn around time as he is busy right now.
(http://uploads.tapatalk-cdn.com/20161117/59f07eba4081a737676df9f82906dacd.jpg)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Maritime on Nov 17, 2016, 16:17:29
Rad puzzle pieces!
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Green199 on Nov 17, 2016, 16:42:03
How have I missed this little beast!

Still going 6.5hp motor?
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 17, 2016, 16:50:54
How have I missed this little beast!

Still going 6.5hp motor?

That's the plan at this point. I had a little mini bike (a few pages back) with one in it, and it has plenty of "go" haha

They are so dirt cheap. Just over $100 for a brand new motor out of the box. Cant complain about that much
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: MotorbikeBruno on Nov 17, 2016, 17:18:26
That's the plan at this point. I had a little mini bike (a few pages back) with one in it, and it has plenty of "go" haha

They are so dirt cheap. Just over $100 for a brand new motor out of the box. Cant complain about that much

Predator engine then?  Is there off the shelf clutches and stuff that fit up easily?  I'd love to make something but limited by time currently (kids and stuff..ha)
Title: Re: Rupp Roadster. I think I'm to big for this
Post by: Hurco550 on Nov 17, 2016, 17:22:47
Predator engine then?  Is there off the shelf clutches and stuff that fit up easily?  I'd love to make something but limited by time currently (kids and stuff..ha)

yeah, anything that is made for a 3/4" straight shaft. I had a centrifugal clutch on the mini bike, but this one will have a cvt setup similar to whats on a snowmobile
(http://uploads.tapatalk-cdn.com/20161117/8b6558a5d489162267d093b3a0f0f1e7.jpg)
(http://uploads.tapatalk-cdn.com/20161117/ee320884680b60727ce4af2167039eca.jpg)
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: bcnSR250 on Nov 17, 2016, 21:34:06
Your making me want to do this in the most real way. It's coming along nicely sir, great job. Now tell your Dad to hurry up

Sent from my phone at a place via an app
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: advCo on Nov 21, 2016, 22:12:18
Run it with the wood frame. You won't!


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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Nov 21, 2016, 22:28:52
Run it with the wood frame. You won't!


Sent from my iPhone using DO THE TON (http://r.tapatalk.com/byo?rid=89466)
Nope lol I won't. I sat on it during mockup and it made some pretty nasty cracking sounds. A wood framed mini bike would be pretty sweet though
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: advCo on Nov 21, 2016, 22:45:31

Nope lol I won't. I sat on it during mockup and it made some pretty nasty cracking sounds. A wood framed mini bike would be pretty sweet though

Well don't make it out of balsa wood. We could make it happen.


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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: canyoncarver on Nov 21, 2016, 23:34:18
I'd wait in line to ride that minibike hurco. 
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Nov 22, 2016, 21:51:26
I'd wait in line to ride that minibike hurco.
It'll be at a few events in next year (hopefully) waiting to be passed around ha
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: JSJamboree on Feb 17, 2017, 15:50:31
Ping


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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Feb 18, 2017, 20:46:39
Ping


Sent from my iPhone using Tapatalk
Still waiting for things to slow down for dad to get the parts cut
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: cxman on Feb 19, 2017, 11:20:42
a little west system epoxy and matting and that thing would be good to go
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: JSJamboree on Jul 26, 2017, 00:22:15
This is something that better not die


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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 26, 2017, 00:23:39
This is something that better not die


Sent from my iPhone using Tapatalk
Funny, I'm going to the shop this Saturday to water jet some parts :)

Sent from my SM-G900V using Tapatalk

Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 29, 2017, 17:42:05
Well, got the bulk of it water jet cut today. Now time for machining and welding :) liking how it's fitting up so far(https://uploads.tapatalk-cdn.com/20170729/23f1e78c2c4f1a9a3a73d5802c24865e.jpg)(https://uploads.tapatalk-cdn.com/20170729/d1763ee6c8f6cceb628aec8699aaf719.jpg)(https://uploads.tapatalk-cdn.com/20170729/5cd8d2e52280bc7fb06a402272aff001.jpg)(https://uploads.tapatalk-cdn.com/20170729/41cc1f6d16420a2604697ff8fa11bd1b.jpg)(https://uploads.tapatalk-cdn.com/20170729/34b9496433342a93317962d656b3c391.jpg)

Sent from my SM-G920V using Tapatalk

Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 29, 2017, 17:43:36
Also dimpled the main frame. Looks good and adds rigidity. Win win
(https://uploads.tapatalk-cdn.com/20170729/98fd61bc507b36a88f46c242d05b21ec.jpg)(https://uploads.tapatalk-cdn.com/20170729/4eaf127f4215a41d23bf782e5003b55e.jpg)(https://uploads.tapatalk-cdn.com/20170729/64219a616a6d8c75015718bb5daabfc4.jpg)(https://uploads.tapatalk-cdn.com/20170729/effb14d4da1b7891220905a602535fc3.jpg)

Sent from my SM-G920V using Tapatalk

Title: Re: was a rupp roadster, now i dont know what to call it
Post by: trek97 on Jul 29, 2017, 19:07:07
Dude, this is starting to become very real.
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: ridesolo on Jul 29, 2017, 19:49:24
Nice! 
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: stroker crazy on Jul 29, 2017, 20:51:12
I don't feel bad about doing a bit of customization

Ha!

Crazy
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 30, 2017, 02:53:38
Got a little more done this afternoon. Drilled and trapped the bottom triple for the stem and bored the holes to size for the fork tubes. Also went ahead and welded up a practice or setup piece. I'm trying to decide wether to weld up the frame and have it powder coated or tig braze it and clear coat the bare metal.
(https://uploads.tapatalk-cdn.com/20170730/9a2e7b647b91ed3af4502e7bd0bfbbe6.jpg)(https://uploads.tapatalk-cdn.com/20170730/371a8a8722187f11d4ccef685da2f863.jpg)(https://uploads.tapatalk-cdn.com/20170730/491d6ef1419026f56bdbd0485ff51f72.jpg)(https://uploads.tapatalk-cdn.com/20170730/3d8432003cda4d7a047da530d0467d5c.jpg)(https://uploads.tapatalk-cdn.com/20170730/90cde2368c4abbc51d10c3a6f134ae2b.jpg)(https://uploads.tapatalk-cdn.com/20170730/67dd16e984c22618a9ef8b81dfb24ca2.jpg)

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: cbrianroll on Jul 30, 2017, 03:03:25
Not sure how I've missed this project...this is so awesome!!
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: dakine_surf on Jul 30, 2017, 08:15:13
How much will the frame weigh when all said and done?

Would this work for a larger bike or would it end up being too heavy


Sent from my iPhone using DO THE TON
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Green199 on Jul 30, 2017, 09:12:50
Braze and clear all day.
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 30, 2017, 11:17:28
How much will the frame weigh when all said and done?

Would this work for a larger bike or would it end up being too heavy


Sent from my iPhone using DO THE TON
Main part that I have tacked up in that last picture is actually really light, Judy guessing around 10 lbs. Now once I mount the 1/4" thick engine plate, rear end, neck tube, Jackshaft ECT, the frame will definitely go up in weight. The plan is to eventually build a full size bike with this same design. This is just more or less a proof of concept

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: dakine_surf on Jul 30, 2017, 11:39:18
Main part that I have tacked up in that last picture is actually really light, Judy guessing around 10 lbs. Now once I mount the 1/4" thick engine plate, rear end, neck tube, Jackshaft ECT, the frame will definitely go up in weight. The plan is to eventually build a full size bike with this same design. This is just more or less a proof of concept

Sent from my SM-G920V using Tapatalk
Very cool, I've had a hardtail frame kicking around in my head that is very similar.  Kinda with board tracker look.


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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Sonreir on Jul 30, 2017, 20:12:17
I expect that this it what it would look like if you bought a bike from Ikea.
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 30, 2017, 20:19:37
Built the rear hard tail and used a fixture I made to locate the rear axle plate(not bought at Ikea), finished machining stuff on the front end, tacked er together and now we have a roller. The front end will come down a bit with the weight of the motor and a less than dainty rider.


(https://uploads.tapatalk-cdn.com/20170730/daeeb5a70084121d93919d97ddaae2f9.jpg)(https://uploads.tapatalk-cdn.com/20170730/72991336f5ed83a0c097486f57a9f994.jpg)(https://uploads.tapatalk-cdn.com/20170730/f05b108e2d2935a917d765b1c4dee68a.jpg)(https://uploads.tapatalk-cdn.com/20170730/c580bae18392b298a7601e756572880b.jpg)(https://uploads.tapatalk-cdn.com/20170730/edf2d9e110df34918d9e7cc5a7226986.jpg)(https://uploads.tapatalk-cdn.com/20170730/dfa37da97d3e45d4eb4c045ef2d0089e.jpg)(https://uploads.tapatalk-cdn.com/20170730/5e14b76c2bcfda998e62374cc90172da.jpg)(https://uploads.tapatalk-cdn.com/20170730/972c8c599e6de6ffad8c629633adb428.jpg)(https://uploads.tapatalk-cdn.com/20170730/efedfa4bfd49991c256a34e794e41178.jpg)(https://uploads.tapatalk-cdn.com/20170730/84d12d759e13ef9ca6bc4a803898ca7a.jpg)
(https://uploads.tapatalk-cdn.com/20170731/c43a9a2f0e62a7e7bdbe5f04ccef9d78.jpg)

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: 1fasgsxr on Jul 30, 2017, 21:52:02
Freaking awesome!
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: jag767 on Jul 30, 2017, 21:54:42
Great project ever. I feel like it needs a big 2 stroke in there, like a rd 350 if it can fit  :P  ;D
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: XS750AU on Jul 30, 2017, 23:53:57
Also dimpled the main frame. Looks good and adds rigidity. Win win
(https://uploads.tapatalk-cdn.com/20170729/98fd61bc507b36a88f46c242d05b21ec.jpg)(https://uploads.tapatalk-cdn.com/20170729/4eaf127f4215a41d23bf782e5003b55e.jpg)(https://uploads.tapatalk-cdn.com/20170729/64219a616a6d8c75015718bb5daabfc4.jpg)(https://uploads.tapatalk-cdn.com/20170729/effb14d4da1b7891220905a602535fc3.jpg)

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Absolutely fantastic original work.
The biggest single improvement you could make for rigidity in the structure is to close in the side plates. By that I mean weld a continuous metal strip down the top of the frame bridging from side plate to side plate. You obviously have access to CAD/CAM facilities if you could get access to some CAE modelling it would confirm that a closed in box section is the most efficient section at resisting bending.
Keep up the great work.
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 31, 2017, 11:59:04
Absolutely fantastic original work.
The biggest single improvement you could make for rigidity in the structure is to close in the side plates. By that I mean weld a continuous metal strip down the top of the frame bridging from side plate to side plate. You obviously have access to CAD/CAM facilities if you could get access to some CAE modelling it would confirm that a closed in box section is the most efficient section at resisting bending.
Keep up the great work.
Thanks man! I have thought about something similar,  but instead of full sheets, maybe some "x" braces in between the vertical ones. Just tacked up though this thing feels surprisingly rigid. I'll see how much more so once it's really welded up and I can do some redneck flex tests.

For now she is safe and sound in the living room. We'll see how well my wife likes motorcycle decoration when she gets home.

(https://uploads.tapatalk-cdn.com/20170731/23664636ad970f52a4d604e4e13fd8f7.jpg)

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: SONIC. on Jul 31, 2017, 14:00:41
Yes sir.
Nicely done.
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: advCo on Jul 31, 2017, 14:05:02
Fan-freaking-tastic
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Maritime on Jul 31, 2017, 14:38:04
All kinds of rad!
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: JSJamboree on Jul 31, 2017, 15:46:24
So whats left of the rupp? The forks?
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 31, 2017, 16:02:14
So whats left of the rupp? The forks?
Ha, not even that. I'll have to look, I think maybe the wheel base and rake share dimensions

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 31, 2017, 16:02:58
All kinds of rad!
Fan-freaking-tastic
Yes sir.
Nicely done.
Thanks!!

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: JSJamboree on Jul 31, 2017, 16:07:32
Looked back and realized that the roadster wasn't like the blackwidow or scrambler, yeah thats totally different.  There is alot of power left in that motor to free up, almost to much.  Pull the governor, get a billet flywheel (the stock one will explode at high RPM), tighter springs, cone filter, exhaust, and throw a mikuni on there so its manageable.  The stock carb turns into an on/off switch at this point and its almost unrideable.  I need to get mine out of the shed
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 31, 2017, 16:12:28
Looked back and realized that the roadster wasn't like the blackwidow or scrambler, yeah thats totally different.  There is alot of power left in that motor to free up, almost to much.  Pull the governor, get a billet flywheel (the stock one will explode at high RPM), tighter springs, cone filter, exhaust, and throw a mikuni on there so its manageable.  The stock carb turns into an on/off switch at this point and its almost unrideable.  I need to get mine out of the shed
funny man, what you just wrote is my exact plans for the motor, plus I'll probably do a billet con rod while I'm at it. For now it's just a cone filter, jetted carb and pipe... because money, or lack there of lol once I get it together and going ill piece the hop up stuff together as funds become available

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: JSJamboree on Jul 31, 2017, 16:16:44
funny man, what you just wrote is my exact plans for the motor, plus I'll probably do a billet con rod while I'm at it. For now it's just a cone filter, jetted carb and pipe... because money, or lack there of lol once I get it together and going ill piece the hop up stuff together as funds become available

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I cant say enough what a difference the mikuni made. Here is the kit that I put on mine.

http://www.ebay.com/itm/22MM-MIKUNI-CARB-KIT-PREDATOR-212-GX200-GX160-HONDA-CLONE-Drift-Trike-Mini-Bik-/252314674798?hash=item3abf20666e:g:10wAAOSwYlJW4GEm&vxp=mtr
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Jul 31, 2017, 16:33:37
I cant say enough what a difference the mikuni made. Here is the kit that I put on mine.

http://www.ebay.com/itm/22MM-MIKUNI-CARB-KIT-PREDATOR-212-GX200-GX160-HONDA-CLONE-Drift-Trike-Mini-Bik-/252314674798?hash=item3abf20666e:g:10wAAOSwYlJW4GEm&vxp=mtr
Yep, I have that saved on my watch list. I think iirc a Yamaha blaster carb is the same size mikuni, and van 2 be had for less coin yet

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: MotorbikeBruno on Aug 07, 2017, 22:17:29
I love this thread!  8) 8) 8) 8) 8) 8)
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: XS750AU on Aug 07, 2017, 23:38:14
Quote
I have thought about something similar,  but instead of full sheets, maybe some "x" braces in between the vertical ones.

Sorry for not getting back to you sooner. Refer to the attached photo, the top section (red line) is in compression, meaning it is being pushed from both ends.  The current structure is not good in compression, much better in tension (being pulled at the ends). Cross braces also work well in tension but not compression, so I would suggest a solid sheet welded along the red line is the best option, but if you wanted to make some cool cut outs down the middle of the sheet then go up a thickness or 2! The current structure will behave a bit like a house of cards, once it goes it will go quickly.
The orange line is of secondary concern, and would just stiffen up the headstem, so you could cut a few seconds off your lap times  ;D. That area is in tension so cross braces would be OK.
Hope this helps.
Love what you have done so far.
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Popeye SXM on Aug 08, 2017, 00:04:02
 The current structure is not good in compression, much better in tension (being pulled at the ends). Cross braces also work well in tension but not compression, so I would suggest a solid sheet welded along the red line is the best option, but if you wanted to make some cool cut outs down the middle of the sheet then go up a thickness or 2! The current structure will behave a bit like a house of cards, once it goes it will go quickly.
The orange line is of secondary concern, and would just stiffen up the headstem, so you could cut a few seconds off your lap times  ;D.

I love this project, but I agree, It could collapse, very quickly, say after a bump or two?
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Aug 08, 2017, 11:25:20
Sorry for not getting back to you sooner. Refer to the attached photo, the top section (red line) is in compression, meaning it is being pushed from both ends.  The current structure is not good in compression, much better in tension (being pulled at the ends). Cross braces also work well in tension but not compression, so I would suggest a solid sheet welded along the red line is the best option, but if you wanted to make some cool cut outs down the middle of the sheet then go up a thickness or 2! The current structure will behave a bit like a house of cards, once it goes it will go quickly.
The orange line is of secondary concern, and would just stiffen up the headstem, so you could cut a few seconds off your lap times  ;D. That area is in tension so cross braces would be OK.
Hope this helps.
Love what you have done so far.

I love this project, but I agree, It could collapse, very quickly, say after a bump or two?

Thanks guys for the input! It really is appreciated. I am not, and do not claim to be an engineer, I'm just a welder that has access to 2d cad software and a waterjet ha. I plan to do a strip on the top and front as described, as well as one for good measure between the two bars of the "hardtail". They wont be just plain strips, they will have a few spots for flared holes as well as slots where I can weld them in to connect to the cross gussets. Even though I did a wood mockup a while back, there are still things that I would change now that I have this one made up and tacked together. But oh well, I will make this one work. Thanks again for the input, it didn't fall on deaf ears!

(https://uploads.tapatalk-cdn.com/20170808/fb0087b36c02b6ec1896e76c18d95c75.jpg)
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: XS750AU on Aug 08, 2017, 19:14:26
Sensational, this is going to be good  ;D
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Dec 01, 2017, 01:38:58
The project isn't dead, I just got distracted by other things per the norm. My wife decided that it was time that the mini bike get moved out of the living room, so out to lift it goes. Working on mounting the rear brake caliper. I have a little bit of Lathe work to do, and the rest of the gussets for the frame should get cut on the waterjet tomorrow. More to come(https://uploads.tapatalk-cdn.com/20171201/9863fcbc1fbd9a4ca8d34600f78ca22a.jpg)(https://uploads.tapatalk-cdn.com/20171201/3f68fb8277b6c824ff790ba9ba401762.jpg)

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: irk miller on Dec 02, 2017, 07:51:46
It's weird to lose our smart ass comments from a day ago.  Now we have to come up with more smart ass comments.
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Dec 02, 2017, 10:05:02
It's weird to lose our smart ass comments from a day ago.  Now we have to come up with more smart ass comments.
Oh man...

Hardtail,  sketchy, gonna wreck it... that's all I got at the moment

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Dec 02, 2017, 10:32:26
I did get some time in the Machine Shop last night to make some spacers and a sprocket carrier. I still have to make a carrier for the rotor on the other side, but I'm getting pretty close to getting the rear wheel finished up. After that I'll be able to set the jackshaft and then it'll be getting pretty close to test ride time once I get the frame welded out.

(https://uploads.tapatalk-cdn.com/20171202/1dc2e70eb857c41bdbfdf7a382e8557c.jpg)(https://uploads.tapatalk-cdn.com/20171202/6375bbd90d32b328e76720e72e9ff7e1.jpg)(https://uploads.tapatalk-cdn.com/20171202/d9a34c9bdfc78e7596c3ac7e328d91a2.jpg)(https://uploads.tapatalk-cdn.com/20171202/8df30b944f2ab285571df397d74faf3b.jpg)

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Brodie on Dec 02, 2017, 15:51:19
It's weird to lose our smart ass comments from a day ago.  Now we have to come up with more smart ass comments.
Big engine + arse above rear wheel = sick flips!
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Dec 02, 2017, 18:30:38
Sensational, this is going to be good  ;D
Got the extra gussets cut on the waterjet. I still have to roll them to match the radius, but it should stiffen this thing up pretty good.

(https://uploads.tapatalk-cdn.com/20171202/507e4de450eae56b3eb8254eec5650d0.jpg)(https://uploads.tapatalk-cdn.com/20171202/aa60fd334f93285583d63141c220ab9f.jpg)(https://uploads.tapatalk-cdn.com/20171202/2984f6dafd6966d0d73a1a82de3ca9c9.jpg)

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: stroker crazy on Dec 02, 2017, 20:27:32
Every new post makes me smile!

This build has come a loooong way:
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Dec 02, 2017, 22:45:53
Every new post makes me smile!

This build has come a loooong way:
Yeah, probably should've started a new thread haha not even a shadow of what I started with

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: ridesolo on Dec 02, 2017, 23:06:04
Yeah, probably should've started a new thread haha not even a shadow of what I started with 

I figure that if you manage to use at least one bolt, nut, or SOMETHING (even a ball bearing!) from the Rupp you'll be golden!
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Hurco550 on Dec 02, 2017, 23:13:24
I figure that if you manage to use at least one bolt, nut, or SOMETHING (even a ball bearing!) from the Rupp you'll be golden!
Haha, good idea. I'll see what I can swipe off it to keep the rupp cred.

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Title: Re: was a rupp roadster, now i dont know what to call it
Post by: ridesolo on Dec 02, 2017, 23:27:08
Haha, good idea. I'll see what I can swipe off it to keep the rupp cred.

I suppose, in a pinch, if you had a repop sticker made that says "Oddster" or "S'upp" or something similar it MIGHT suffice...   ::)
Title: Re: was a rupp roadster, now i dont know what to call it
Post by: Brodie on Dec 03, 2017, 00:11:57
I have the half rusted through rear fender of my first Z50A on my custom built one. It is the only original part on it but it is still a Z50A