DO THE TON

Blood Sweat Tears and Grease => Projects => Enduro / Dirt / Scramblers => Topic started by: dynamitedave on Aug 17, 2015, 12:50:17

Title: SL / CB350 Mash Up
Post by: dynamitedave on Aug 17, 2015, 12:50:17
I started my latest CB350 project this weekend. I wanted a dirt bike style bike. Something more than a CL. It's a 71 CB with SL350 triple tree, forks, and 21" front wheel. The forks are 4" longer than CB forks and they are 35mm instead of 33mm. The rear wheel axle mount was moved down 2.25" and back 3.5". The ground clearance was increased by 3".  I think it looks cool.  My phone ran out of memory so I just have this one picture so far.


Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Aug 17, 2015, 13:02:10
that aint gonna work what you did with the rear axle
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 17, 2015, 15:27:35
that aint gonna work what you did with the rear axle

The rear axle area isn't welded in the picture so you don't know what I did but enlighten me, what won't work?
Title: Re: SL / CB350 Mash Up
Post by: WhyNot on Aug 17, 2015, 15:39:35
I gotta see this pan out.....................

Another small bike project............cool.
Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Aug 17, 2015, 17:01:28
The rear axle area isn't welded in the picture so you don't know what I did but enlighten me, what won't work?
dropping the axle on the swinger 3" wont work just get an sl frame
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 17, 2015, 17:56:06
dropping the axle on the swinger 3" wont work just get an sl frame

What won't work about it?  Looks pretty simple to me.  I don't want an SL, I'm not a fan of their frames or how they look in general. 
Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Aug 17, 2015, 18:07:24
if you cant figure it out i suggest you put down the tools.........
Title: Re: SL / CB350 Mash Up
Post by: Davy123 on Aug 17, 2015, 18:19:51
the sl frame is all tubular and stronger unlike the flexing pressed steel of the cb ..my £2 worth  8)
Title: Re: SL / CB350 Mash Up
Post by: CALfeRacer on Aug 17, 2015, 20:43:08
It would probably help your case to explain how you plan to move the rear axle. That way people can look at your plan and offer constructive criticism of your plan. Hard for us to have your vision when it's in your head ;)
I'm interested to see where this goes though.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 18, 2015, 09:58:35
No thanks, I'll just build it how I want. 
Title: Re: SL / CB350 Mash Up
Post by: hossler on Aug 19, 2015, 01:34:22
Why wouldn't you just get longer shocks?
Title: Re: SL / CB350 Mash Up
Post by: redwillissuperman on Aug 19, 2015, 01:44:00
No thanks, I'll just build it how I want.

I think the concern is that the axle placement drastically changes the leverage and rear axle travel that may have undersireble handling effects and chain effective length changes. The same may be true with getting longer shocks.

One course of action would be to locate the front pivot lower or maybe adjust the seat subframe angle to create more room above the tire.

Your initial design could work but I would maybe look at relocating the engine higher in the cradle to move the front sprocket and reduce the arc that the chain would need to go through.
Title: Re: SL / CB350 Mash Up
Post by: redwillissuperman on Aug 19, 2015, 01:48:00
(http://www.motodacross.com/husqvarna/cr430/1979.jpg)

Maybe something like the CR390 could be inspiration?
Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Aug 19, 2015, 02:51:35
when you have an ignorant "builder" that does things based on how cool it looks talking sense is a lost cause
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 19, 2015, 10:56:11
I think the concern is that the axle placement drastically changes the leverage and rear axle travel that may have undersireble handling effects and chain effective length changes. The same may be true with getting longer shocks.

One course of action would be to locate the front pivot lower or maybe adjust the seat subframe angle to create more room above the tire.

Your initial design could work but I would maybe look at relocating the engine higher in the cradle to move the front sprocket and reduce the arc that the chain would need to go through.

Thanks for your concern.  I have mocked it up, tested it, and taken some measurements and I don't think there will be a problem.  Only way to know for sure is to build it.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 19, 2015, 10:57:41
when you have an ignorant "builder" that does things based on how cool it looks talking sense is a lost cause

Fuck off
Title: Re: SL / CB350 Mash Up
Post by: WhyNot on Aug 19, 2015, 22:01:09
^^^^^^teehehehehehehehehe^^^^^^^^^^^^^^^^
Title: Re: SL / CB350 Mash Up
Post by: redwillissuperman on Aug 22, 2015, 22:48:32
its all cool...
Title: Re: SL / CB350 Mash Up
Post by: Sonreir on Aug 22, 2015, 23:58:52
I get stretching the swinger to move the axle back, but how are you going to move it down?
Title: Re: SL / CB350 Mash Up
Post by: Davy123 on Aug 23, 2015, 05:42:31
maybe this ... 8)
Title: Re: SL / CB350 Mash Up
Post by: Sonreir on Aug 23, 2015, 09:49:57
So you're replacing the swing arm?
Title: Re: SL / CB350 Mash Up
Post by: maxDTM on Aug 24, 2015, 23:20:04
(http://mrwgifs.com/wp-content/uploads/2013/07/Clay-Fox-Eating-Popcorn.gif)
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 25, 2015, 11:10:55
To lower the axle and move it back I cut up another swing arm and took the mounting plates out and welded them to the existing axle plate and filled in the blanks with 1/4" plate.  I still have more welding and reinforcing to do but I'll do that after I take the bike all apart. You can't really see it in the picture.

I mounted a SL350 front fender, some thick dirt bike handle bars I had, a CL350 gas tank, I welded on some side covers to hide the battery from view, and extended the exhaust pipe and mounted two Harley Sportster mufflers. I think they are a good size but they are heavy. I ordered a Honda XR450 rear fender, it should be here today.

The rear shocks are kinda soft.  They aren't too bad actually but I was experimenting and I cut a one inch spacer and put it them on top of the spring.  Now they are a little too stiff so I'm going to cut half inch spacers tonight and try them out. 

Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Aug 25, 2015, 12:06:32
that swingarm might work but the twisting loads on the main tubes is a lot higher than they were designed for because of the silly  offset like that. you have mooved the twisting loads way off centerline of the main tubes giving it leverage that multiplies the forces  :'(....the shocks will not work at all ..you need shocks with a much stiffer overall rate on the spring no amount of preload is going to fix that issue.you also need a shock with much firmer damping now you have increaSED REAR WHEEL TRAVEL BY AT LEAST 50%
it is not to late to scrap what you have done and just do a proper swingarm with longer shocks
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 25, 2015, 12:40:16
that swingarm might work but the twisting loads on the main tubes is a lot higher than they were designed for because of the silly  offset like that. you have mooved the twisting loads way off centerline of the main tubes giving it leverage that multiplies the forces  :'(....the shocks will not work at all ..you need shocks with a much stiffer overall rate on the spring no amount of preload is going to fix that issue.you also need a shock with much firmer damping now you have increaSED REAR WHEEL TRAVEL BY AT LEAST 50%
it is not to late to scrap what you have done and just do a proper swingarm with longer shocks

I pretty much disagree with everything about you, except your avatar.  I'll build the bike and ride it around and the world well still spin. Someday I might move the shock mounts back and use longer shocks but for now I'm sticking to my original design.  I hope you find happiness somewhere out there and someday discover the fantastic, wonderful world of proper case and punctuation.  Good day sir.
Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Aug 25, 2015, 12:47:12
what i have stated is indisputable fact, written in stone ......educate yorself about suspension and frame geometry you will be better off for it and hopefully not be killed outright on the deathtrap you are building or worse cause an accident involving innocent civies
Title: Re: SL / CB350 Mash Up
Post by: redwillissuperman on Aug 25, 2015, 14:47:38
I pretty much disagree with everything about you, except your avatar.

We all agree on the avatar.
Title: Re: SL / CB350 Mash Up
Post by: WhyNot on Aug 25, 2015, 15:23:23
We all agree on the avatar.

Absolutely......just wish I could zoom in on it a little better........ >:(






Wanna see what size tire that is................... :P
Title: Re: SL / CB350 Mash Up
Post by: Turnturtle on Aug 25, 2015, 16:38:52
Here you go... You can check out much more than the tire size!  http://joyreactor.cc/post/1961800
Title: Re: SL / CB350 Mash Up
Post by: WhyNot on Aug 26, 2015, 06:25:04
Here you go... You can check out much more than the tire size!  http://joyreactor.cc/post/1961800

oh well, it's restricted on the work puter.......
Title: Re: SL / CB350 Mash Up
Post by: redwillissuperman on Aug 26, 2015, 12:24:46
Global work productivity just dropped 98%
Title: Re: SL / CB350 Mash Up
Post by: sleventynineR on Sep 08, 2015, 21:29:09
Enjoying the show so far...... that's quite the collection of tanks you got up there on the shelves.....drooling :P
Title: Re: SL / CB350 Mash Up
Post by: WhyNot on Sep 08, 2015, 21:42:12
Enjoying the show so far...... that's quite the collection of tanks you got up there on the shelves.....drooling :P

Yea, any for a CB100?

Like the stance of the bike too.
Title: Re: SL / CB350 Mash Up
Post by: adamchance on Sep 28, 2015, 16:19:18
This thread turned from a build to a porn site pretty fast but I'll be following this, going to be pretty interesting to see how everything pans out and what the finishing product is!


Sent from my iPhone using Tapatalk
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Sep 29, 2015, 17:23:11
I have a complete CB100 I need to work on. It needs a lot of help.  The engine needs a new top end installed.  I have it. Just need to do it. 

I have taken a break from this bike for a couple weeks. I was getting my boat ready to sell and I spent a week or so working on my go kart.  I did paint the frame tho and started assembly.

I might get back on it next week.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Apr 27, 2016, 13:30:13
The bike is almost done.  I need to install the headlight and find a seat pad for it.  I also plan to put badges on the gas tank. It runs pretty well, though it smokes a little out of the right cylinder.  I haven't ridden it yet.  Maybe this weekend after I hook up the rear brake.
Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Apr 27, 2016, 16:09:21
just be sure and loosen up that chain a bit it looks too tight
you will need about 4 -6 inches of up and down slack,that is an estimate but you can ,in fact you must ,verify how much you need... dont do that and you will break shit
you cant go by the honda manual to adjust the chain anymore
Title: Re: SL / CB350 Mash Up
Post by: xb33bsa on Apr 27, 2016, 16:12:29
oh and be fucking careful you have fucked up the stability of the bikes handling enough that it could very well kill you
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on May 02, 2016, 09:58:18
I rode the bike this weekend.  It's pretty awesome.  I got new rear shocks off of a 1981 CB650, they are longer and the coil is thicker, no preload spacer is needed.  The bike handles good and the large tires allow me to roll over stuff with ease. The turning radius is a little more than stock due to the larger tires and stretched wheelbase but still manageable.  I need a seat cushion for it and I need to install the headlight, then I'll be ready to rock. 
Sorry I didn't die, xb33bsa.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on May 02, 2016, 09:58:48
One upload per post? lame.
Title: Re: SL / CB350 Mash Up
Post by: 1sttimer on May 02, 2016, 11:04:59
This thing is too cool.  Neat use of the modern-ish fenders - make sure you don't keep it too clean  8)
Title: Re: SL / CB350 Mash Up
Post by: Caf3racer on May 02, 2016, 13:07:23
One upload per post? lame.

On the other hand, you COULD click on where it says "more attachments" and do MORE than one per post.  Lame.  ::)
Title: Re: SL / CB350 Mash Up
Post by: 1fasgsxr on May 02, 2016, 13:26:46
^^  ;D  Ha Ha...I thought about it but didnt say it
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on May 02, 2016, 15:25:38
^^ Touché.  I didn't see that link.  You guys are just too cool for me.  thanks pimps.  Now I know, and knowing is half the battle, GIJOE
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on May 06, 2016, 16:55:49
Here it is next to a stock CL350.  It's a little bigger and longer of course.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Jun 13, 2016, 13:12:37
I took the bike to White Rose Swap meet in PA and rode it around on the mountain. It was fun.  Bike did great.  I even jumped it a little on the race track on top of the hill.  It's a fun place.  The Japanese show is mid august. You kids should come hang out.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Jul 12, 2016, 17:48:07
I went to the AMA Vintage Motorcycle Days this weekend.  It was fun. I took this bike so I could ride around everywhere and it did great.  I made a basket holder for the back so I could put treasures in it.  Fun times. You guys should go someday.

Title: Re: SL / CB350 Mash Up
Post by: Mr.E on Jul 13, 2016, 13:32:27
Bike looks great man. And mid o is a place my wife and I try to go every year. Missed this one tho, just too much going on. Will you be at barber in October?
Title: Re: SL / CB350 Mash Up
Post by: 1fasgsxr on Jul 13, 2016, 13:34:35
I am only a cpl hrs away and missed this yr.. >:(
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Jul 15, 2016, 11:56:39
Will you be at barber in October?

Barber is too far from my home in Northern VA. It would be fun but I'm going to the time trials at El Mirage CA in November and don't think I'll be able to pull off both trips.  I plan to go to Mid-Ohio every year from now on if I can.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Jun 12, 2017, 15:51:34
The bike is a year old now and it's still kicking. I do have some updates planned for it. I ordered a larger rear sprocket and smaller front sprocket. I'm also going to repad the seat, it's hard. I'm taking it to AMA Vintage Motorcycle Days next month. I was launching it off the jumps on the racetrack in the back. It was super fun.
Title: Re: SL / CB350 Mash Up
Post by: dynamitedave on Aug 22, 2017, 18:18:47
The bike is still kicking ass. I put stock air filters and side covers on it. The pods were not cutting it. They let in too much dust and might have caused the engine some harm. These pictures are from the Vintage Japanese Swap meet near Hanover PA this month.