915 superbike on the cheap

[rockcitycafe]

figured I'd start a build thread since I've been putting a lot of bike pics on the engine build thread, I scrounged the parts for the engine over a couple years, had the idea after looking at some kz440 pistons for a cb350, seemed like making a 915 would be cool too. Bought a cb750 from a guy early this spring, he didn't want much for it, I've already got a rider so I figured this one would be for "playing", it was in pretty good shape but the tires were shot. Looked at buying new tires for it when I happened upon a zzr1200 front end and rear wheel on craigslist for what new tires would cost, so that solved that, once I got the wheels I really got inspired to build a real performance bike. I want to keep the stock geometry as much as possible, so I machined trees instead of trying to cob the zzr trees to the 750, custom swingarm keeps the back end pretty much stock as well.

 

[rockcitycafe]

Built a seat, built revision 1 trees, built a mold and pulled the lightweight seat for use, turned out I miscalculated the offset so I wound up making a second revision of the trees to keep the stock 750 trail

 

[rockcitycafe]

working on tree revision 2, made them with proper offset and step in top clamp to keep stock trail as best as possible, carved a foam blank of the tank shape and started making the metal tank

 

[rockcitycafe]

started working on the swingarm, stock length and everything, just needed to be wider to accommodate the rear wheel

 

[Tim]

Can't wait to see this one progress - next thing you'll be building your own frame

 

[VonYinzer]

Signed up.

 

[rockcitycafe]

Can't wait to see this one progress - next thing you'll be building your own frame

actually thinking about removing the steel rear frame section and replacing with aluminum, gotta figure out the weight saving potential first though

 

[canyoncarver]

Onboard. Very cool.

 

[Green199]

Yes.

 

[GB400 fan]

yep following! looks great already

 

[suthern]

Looking great so far. All the custom fab is really cool.

 

[Maritime]

Ahh the bike that goes with the crazy engine. Signed up to what all the radness unfold.

 

[ohiocaferacer]

Looks good!

 

[focusinprogress]

Coming along nicely. I really like the shape you're making the tank

 

[smajure]

Bad Ass Man!!!

 

[SONICJK]

Looks sweet man!

How do you form the Alum for the tank over the foam? Or do you have a wooden plug somewhere we cant see in the picture?

 

[Sonreir]

I'm on board.

 

[suthern]

How do you form the Alum for the tank over the foam? Or do you have a wooden plug somewhere we cant see in the picture?

I was wondering the same thing. it would be interesting to see the process

 

[Rich Ard]

In as well.

 

[DreadRock]

I'm in but I'm sure nothing to add !