DO THE TON

Blood Sweat Tears and Grease => Projects => Restorations => Topic started by: JSJamboree on Sep 30, 2012, 23:49:51

Title: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 30, 2012, 23:49:51
Well, I only had 3 bikes in my garage, and while painting my 100 this weekend I got a little nostalgic with an old 71 Rupp Blackwidow mini-bike I use to tear around on.  Its been sitting for about 10 years when I blew out a bearing and wouldn't start.  Decided to nab it from the parents house and bring it home for some tender love.  Going to see about getting this bad ass mini-bike back in the dirt.  Sorry if I offend anyone by having a build thread for this bike, but i figured since it had more CCs than my CB100 cafe bike that someone might get a kick out of it.  Hopefully I wont have as much into it as the CB100, but if thats what it takes.. so be it.

(https://lh6.googleusercontent.com/-XZMR79GdVFE/UGjg15xsMhI/AAAAAAAACTE/-P6Q56UNxjQ/s895/WP_000250.jpg)

(https://lh5.googleusercontent.com/-n_oD51m2SNk/UGjg1GVcQPI/AAAAAAAACS8/j6TVzSR1_6U/s895/WP_000254.jpg)
Title: Re: Nostaligic build, 71ish Ruff Black Widow resto
Post by: Big Rich on Oct 01, 2012, 00:59:31
Cool scoot Jordan! What size are those tires?
Title: Re: Nostaligic build, 71ish Ruff Black Widow resto
Post by: joeyputt on Oct 01, 2012, 12:19:26
Brother I think it is awesome that you are restoring your old mini bike and that you started a build thread for it, man I wish I had the old mini bike that me and my Brother used to have when we were children as I would love to restore it as well!
Title: Re: Nostaligic build, 71ish Ruff Black Widow resto
Post by: JustinLonghorn on Oct 01, 2012, 15:19:12
Righteous.
Title: Re: Nostaligic build, 71ish Rupp Black Widow resto
Post by: JSJamboree on Feb 14, 2013, 17:29:44
Well, been working on this guy for while.. Should have taken pics of the process but I didn't...

Anyways, after a bunch of research I found out the motor isn't what normally came on them, and I cant find any information about the B&S motor thats on it.  Cleaned out the carbs but wasn't able to find a rebuild kit so hopefully the seals etc hold up.  Got it all stripped down, cleaned it up and painted it, putt back together now.  Decided to replace as little as possible and not do a full resto but instead just get it running and 'nice'.

Here you can see the reason of its final death.  Was eating high speed bearings beacuse the shaft was so screwed up it was just bouncing around in them.

(https://lh3.googleusercontent.com/-SIeViZu3Mnk/UR1VWiuNm5I/AAAAAAAACbg/PD8y9GkaC7g/s567/IMG_20130214162122.jpg)

Here you can see the new one that was made for me to replace it

(https://lh5.googleusercontent.com/-m_NZuxYVGMs/UR1VRAVtVRI/AAAAAAAACbY/D-GKF-ty7_c/s567/IMG_20130214162100.jpg)

Here it is in its current state.. Dont plan to paint the wheels just going to leave them as I plan to get them dirty anyways in the mud.  Trying to bid on some shocks for it as I found out one of mine had about a 10dev bend where we had just stressed it to much and the other fell apart when I took it off.. so they were shot.  Table was a little messy

(https://lh3.googleusercontent.com/-ym1K6RglDsI/UR1VMRasxFI/AAAAAAAACbQ/qw09671WjPk/s756/IMG_20130214162037.jpg)





Title: Re: Nostaligic build, 71ish Rupp Black Widow resto
Post by: Big Rich on Feb 14, 2013, 21:53:43
Jordan, you said carbs (plural). Is there 2?

I have a couple smaller carbs around, any idea if you can retro-fit something?
Title: Nostaligic build, 71ish Rupp Black Widow resto
Post by: JSJamboree on Feb 14, 2013, 22:41:35
I think making things plural is a force of habit. There is a singular carb on this guy. I'm going to see how it works when I get it together, not sure about retrofitting with how it's setup (ill take a pic of this weird feat of engineering tomorrow and show you. I'm sure I could take a pic and call jackssmallengines and they could figure it out. Well see how it goes and cross that path if necessary.
Title: Re: Nostaligic build, 71ish Rupp Black Widow resto
Post by: JSJamboree on Feb 15, 2013, 15:16:12
Here is the carb thats on it.  there arnt any markings anywhere on it and I havent seen another like it on ebay or anything to find information.  Only know its on a B&S..  I found some kits that 'looked' like the seals on mine, but were always for 11hp motors.. this is 3.5hp.
Title: Re: Nostaligic build, 71ish Rupp Black Widow resto
Post by: jeff4uk on Feb 21, 2013, 08:57:09
The carb may also be fitted to lawn mowers (3.5 bhp) !!!!
Title: Re: Nostaligic build, 71ish Rupp Black Widow resto
Post by: JSJamboree on Sep 17, 2015, 10:20:59
So it's been awhile since I posted on this. Last I was working on it I got the frame all pretty and put it all together but couldn't get it running. I quickly lost interest and it went back in the barn.  The hoodcats have started getting into minibikes with Tifuns CT70 spurring us on so I decided to start back on this.

First I changed out the coil on the Briggs, cleaned out the carbs again, and made sure everything was straightened out with the motor and still nothing. Got tired of fucking with it and went to HF and bought a 6.5 hp predator motor.

First things first, gas tank, intake, and exhaust had to be removed to get it into the frame. No biggie. However that means I needed aftermarket exhaust, intake.  Ended up getting a intake, diy exhaust kit from NRRacing. Came with bigger jets. Also removed the governor, but everyone says the stock flywheel will Grenade, so a new billet flywheel was purchased.  Luckily, with a 1/4" spacer, the stock clutch setup works so I didn't have to worry about that.



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Title: Re: Nostaligic build, 71ish Rupp Black Widow resto
Post by: JSJamboree on Sep 17, 2015, 10:23:23
With all the rest of the mods, the valves tend to start floating, so upgrading the valve springs is a must. Being impatient like I am, I tried to do it with the head on and in the bike. Next thing I know a keeper fell down the motor so I had to start taking it apart till I found it. I did find it, and now the head is back on.  There is going to be way to much power for this bike. Hopefully it doesn't just turn the frame into spaghetti


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Title: Re: Nostaligic build, 71ish Rupp Black Widow resto
Post by: JSJamboree on Sep 17, 2015, 10:24:43
Here is a better shot of the motor in the frame.


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Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: MotorbikeBruno on Sep 17, 2015, 11:46:14
That is wicked. We need vids when you first fire it up and rip around on it...just in case there's some comedy gold to be had.  With all of these "little" bike builds I'm getting the bug to build something now too...

Great work so far! Bummer about the keeper falling in :( glad  you got it sorted.
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Luugo86 on Sep 17, 2015, 21:11:58
Cool ass little bike man.. ill be watching this one
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Hurco550 on Sep 17, 2015, 22:20:48
These are sure popping up on here =) I got one going (well it all started with a black widow anyways) and ridesolo has a 70 Rupp Enduro going too! I'm liking this.
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 17, 2015, 22:32:05

These are sure popping up on here =) I got one going (well it all started with a black widow anyways) and ridesolo has a 70 Rupp Enduro going too! I'm liking this.

I started this thread three years ago. I like to think I am way ahead of the curve


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Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Hurco550 on Sep 17, 2015, 22:33:30
I started this thread three years ago. I like to think I am way ahead of the curve


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Haha yeah I caught that after I made that post. Well then, I'm glad your back on the project =) I'm excited to see it done
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: irk miller on Sep 18, 2015, 07:42:04
 You guys are going to make the campers happy at Thaw, I can see it now.  Bring it on.


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Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 18, 2015, 10:57:27
You guys are going to make the campers happy at Thaw, I can see it now.  Bring it on.


Would be awesome to find some dirt track or field we have permission to rip around in next year.  Would like to be able to have some fun without us all getting arrested :)
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Tune-A-Fishİ on Sep 18, 2015, 11:15:53
Yep... it's about time for the pit bike thing to come around again guess I should drag one out and start a thread  :o
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Hurco550 on Sep 18, 2015, 11:19:48
Yep... it's about time for the pit bike thing to come around again guess I should drag one out and start a thread  :o

yep, whats the hold up ol man =)
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Tune-A-Fishİ on Sep 18, 2015, 12:00:21
yep, whats the hold up ol man =)

Hey now Scooter... you'll get yer turn ;) I am thankful for my time on the blue ball, but I aint done yet :o
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 18, 2015, 12:23:21
Looks like my new chain, throttle, and carb should be here over the weekend.  Need to pickup the exhaust from Mothgils over the weekend and get it painted and wrapped.  Should be ready for its first 'race' this Tuesday!

We will likely be creating a thread somewhere on here for our 'racing' shenanigans.  Sure to be some fun times for all.
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Tune-A-Fishİ on Sep 18, 2015, 12:30:47
Looks like my new chain, throttle, and carb should be here over the weekend.  Need to pickup the exhaust from Mothgils over the weekend and get it painted and wrapped.  Should be ready for its first 'race' this Tuesday!

We will likely be creating a thread somewhere on here for our 'racing' shenanigans.  Sure to be some fun times for all.

What type of track... figure 8 would be fun!!
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 18, 2015, 12:49:53
What type of track... figure 8 would be fun!!

We have setup tracks in the backyard of each of our houses, 'single track' time trials. Our neighbors love us.  We are looking for some open land someplace that we can create an actual track with straw bails where we can actually race.
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Hurco550 on Sep 18, 2015, 12:51:29
I got a good "circuit" we can run around the sub division. It's asphalt to, so we're playing for keeps lol
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: Tune-A-Fishİ on Sep 18, 2015, 13:24:58
We so did this when honda came out with the CRF50, I bought 2 from Sun Racing in Denver... we destroyed those things until they got stolen right off the farm, I had 3 tracks then one 8/10 mile MX track AMA spec an Arena Cross section with stadium hit and chain breaking whoops.... aaaand the  Fity Nationals track haha... Built in an old feed lot so if it was muddy it stunk like hell :o
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 19, 2015, 19:22:53
Last week while I was ripping shit off the motor I thought I was clever by ripping the governor out of the carb. Being use to slide carbs this extra throttle plate was odd.  This left some holes which could cause turbulence so I filled them with JB weld. I hadn't read anywhere about people doing this but it made since to me.

Well, couple days later it dawned on me, that's not the 'governor' that's the throttle.  The governor just manipulates the throttle.  That carb was stripped and thrown into the garbage. Thankfully a new carb is only $17.  Got the new one jetted and installed. This time with the throttle plate :)


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Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 19, 2015, 19:31:32
Found out the motor was to far left in the frame in the mounts created for the Briggs motor. The rear clutch would hit when it was fully expanded. Moved the motor back to the original mounting holes. This however has caused the need for a 5/8" spacer on the shaft. I currently have a piece of pvc while a spacer is being made.

Also got the new carb mounted with the intake and new throttle. Cable that came with it was a little small so it's oddly ran, but I'll make a new one at some point. Works well. Next to get the exhaust finished.


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Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 20, 2015, 15:30:56
Finished the exhaust today. Port matched and cleaned up the inside of the tube. Got it painted and installed. Because I had to move the motor the exhaust doesn't sit as perfect, o well, it's still good.


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Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 20, 2015, 20:01:39
Clutch cover on, chain guard on. Had to make new brackets for both, but they fit well.  Just need some oil and and a chain and we will be ready to rip.

Don't mind the extremely dirty lift.


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Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 24, 2015, 13:59:44
Did a few test run and found a few small issues.  Front sprocket was backwards, clutch loosened up so I had to get a shorter bolt, and a few other little guys.  Clocked it at 49.4 mph.  Pretty happy with it right now, blast to drive.
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 24, 2015, 14:05:35
https://www.youtube.com/watch?v=kyQm3kKPR7s

https://www.youtube.com/watch?v=tdPlJX9W--0
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: DohcBikes on Sep 24, 2015, 15:14:17
Awesome man. 49mph on that must be a blast! It looks great.

Front brakes are for pussies. :-X
Title: Re: Nostaligic build, 71ish Rupp Black Widow, now race build
Post by: JSJamboree on Sep 24, 2015, 16:34:18

Front brakes are for pussies. :-X

So are helmets, shoes and pants