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Author Topic: New CB350 Project - Ball Breaker  (Read 12730 times)

Offline dynamitedave

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New CB350 Project - Ball Breaker
« on: Jan 24, 2011, 13:54:01 »
I picked up a pile of shit CB350 from a motorcycle yard sale guy for next to nothing.  I really just needed the engine.
 
 I'm running out of styles for CB350s so it took me a little while to figure out the direction I wanted to go.
 
 I cut it up, lowered it, hard tailed it.  I plan to recess the seat and have a low gas tank.  Might have to make my own or cut up and reweld one I have laying around.
 
 This is what I started with.  You can see how much I lowered it in the front by the fork tubes sticking out the top 3".  I plan to run only a front brake, no back brake, the bike is so low the brake pedal would scrape when I turn.  I plan to use clip-ons mounted below the top plate of the triple tree.
 
 
 
 
 
 
 The look I'm going for.  Low and sexy.  It will prolly not handle good, be stiff, be dangerous but fuck it.  It should look cool.  I found a 19" front wheel in my shed I'm going to try to use.  This one is the stock 18" wheel.
 

DAYS LATER

I got some work done this weekend.  I mounted the seat support bars and did some sheet metal work.
 
 
 
 I bent the edges of the sheet metal by beating it with a body hammer over a round pipe to match the contour.
 
 
 Fully welded. Almost.
 

Offline joeficsit

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Re: New CB350 Project - Ball Breaker
« Reply #1 on: Jan 24, 2011, 13:58:31 »
i thought cb350's came with 19" fronts?  that's good to know that some came with 18's so that i can use it on my cb200.  keep up the good work.

Offline dynamitedave

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Re: New CB350 Project - Ball Breaker
« Reply #2 on: Jan 24, 2011, 14:25:57 »
CL350s came with 19" front wheels
CB350s and CB360s all had 18" wheels.

My CB350 Bobber has a 21" front wheel that came off a '72/'73 SL350.  Uses the same street hub as the CB350s with front drum brakes.  Wish I could find some more of them.

Offline dynamitedave

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Re: New CB350 Project - Ball Breaker
« Reply #3 on: Jan 26, 2011, 12:44:56 »
I cut a 2" section out of a gas tank, looks good, need to weld it up tho.


Also made a little tray to recess the battery in the swing arm

Offline VonYinzer

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Re: New CB350 Project - Ball Breaker
« Reply #4 on: Jan 26, 2011, 12:55:34 »
Wow... Well, its different for sure.
That shit's bananas.

Offline VonYinzer

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Re: New CB350 Project - Ball Breaker
« Reply #5 on: Jan 26, 2011, 12:56:52 »
Seems way too low to be rideable man. Maybe thats just because its sitting on the table though.
That shit's bananas.

Offline VonYinzer

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Re: New CB350 Project - Ball Breaker
« Reply #6 on: Jan 26, 2011, 12:59:06 »
Also... It the backbone only welded into the stamped steel at the bottom of the neck with the top just made from sheet metal?
That shit's bananas.

Offline VonYinzer

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Re: New CB350 Project - Ball Breaker
« Reply #7 on: Jan 26, 2011, 13:00:58 »
Ok, last one... Are you aware that as you have it built now, that frame is probobly going to fold in half? Not trying to be a dick, but you could really get hurt.
That shit's bananas.

Offline dynamitedave

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Re: New CB350 Project - Ball Breaker
« Reply #8 on: Jan 26, 2011, 14:30:45 »
This is why I usually don't post up my bikes until they are done.  There is always someone who thinks they are a mechanical engineer.  I didn't show every little detail but the backbone is welded in the neck along with added supports, it's welded to the existing pressed sheet metal frame and tied into the main structure with added support.  The sheet metal I used is the same gauge or thicker than the existing sheet metal.  It's much stronger than a stock frame which it needs to be since this is a hard tail.

The bike is low but not too low, I rolled it outside and checked before I welded it in place.  It's too low to use the stock foot pegs since it has that bar that comes under the engine.  I'm also not running a rear brake so the pedal won't get in the way.

« Last Edit: Jan 27, 2011, 00:28:43 by dynamitedave »

Offline VonYinzer

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Re: New CB350 Project - Ball Breaker
« Reply #9 on: Jan 26, 2011, 14:45:40 »
Wow man... You dont have to be a jackass.
The fact is that if its not perfect, it can fail. Some of the things in your pics look shady. If you did more work to sure everything up, than show that too.
I never said I was an "engineer", just asking questions to look out for/help out fellow builders.
Since you apparently have it all wrapped up just fine, good. When/if it fails, I hope youre wearing a helmet.

In the end its your ass... Do whatever the hell you want. If you dont want people commenting/asking questions, dont post pics.

Best of luck.
That shit's bananas.

Offline VonYinzer

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Re: New CB350 Project - Ball Breaker
« Reply #10 on: Jan 26, 2011, 14:55:09 »
And really... Why wouldnt you just build a real hardtail anyway?
That shit's bananas.

Offline dynamitedave

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Re: New CB350 Project - Ball Breaker
« Reply #11 on: Jan 26, 2011, 16:22:04 »
Easy killer.  I don't think I was a jackass, I'm just having fun.  I'm not going to take a million pictures showing everything I do to the bike and post them up, that would take forever and be boring.  I post up pictures of good progress with the idea that viewers can use their imagination and fill in the blanks.

Build a real hardtail?  You mean buy a pre fabricated frame and bolt parts on it?  That wouldn't be any fun.  I like cutting, forming, shaping and welding metal.

Offline VonYinzer

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Re: New CB350 Project - Ball Breaker
« Reply #12 on: Jan 26, 2011, 16:53:14 »
No. I mean a frame that doesnt use the swingarm as part of the "hardtail". Again, its your bike. Do whatever the hell you want. But if you post pics of unsafe mods, people will call you out. I also dont know of any bobber/chopper builds here that are all "bolt on" cookie cutter deals so Im not sure what that comment was about. And really man, I wasnt giving you a hard time. I was asking reasonable questions about the integrity of your frame. Seeing as you apparently have it all under control, forget I asked. Best of luck.
That shit's bananas.

Offline PHeller

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Re: New CB350 Project - Ball Breaker
« Reply #13 on: Jan 26, 2011, 20:43:23 »
Despite the structural integrity of the rear frame, I'll just comment on the design.


It doesn't look cool. I don't like seeing the swingarm joints. The whole rear looks pretty messy. I'm not seeing any flow to the lines, not only that it doesn't have the cool "open area" left in the rear frame on a proper hardtail.


The front is pretty rad though. Nice call on the tank chop and hiding the front frame gussets.


I'd try to simplify the rear and make it flow with the front frame sections.

Offline dynamitedave

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Re: New CB350 Project - Ball Breaker
« Reply #14 on: Jan 26, 2011, 22:55:07 »
I left the swing arm in tact for ease of building.  Leaving the swing arm mounted ensures the back tire winds up where isn't supposed to, also ensures the sprockets line up and the tire is true horizontally and vertically.  Someday I'll build a jig to hold everything in place for now I did it this way. 

The "open area" you call cool looks ridiculous to me.  I don't like when they stretch out the bikes and have a big voided space between the rear wheel and engine. 

I think it will all come together when the bike is painted and all the parts are on it.  Most people won't even notice the swing arm is bolted in.