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Discussion Starter · #1 ·
Howdy boys and squirrels. I have an idea that I am sure others have had. But the difference I am seeing in my particular idea is my platform. I have a 1981 Honda CB750C that I originally bobbed and put monkey bars on. However, I have only ridden sport and dirt bikes, so turning with said bars is nerve wracking.

So heres the idea. Take my bike, make it a streetfighter. The bike (for those who may not know) has an inline 4 DOHC motor. Its also a fairly light bike, so I shouldn't have any issues as far as that goes. The basic idea, and the most immediate, is chop the tail the rest of the way off, install a newer model sport bike subframe, café style bars, rearsets and a custom headlight. The more advanced and farther down the road idea involves swapping out the front end to something like an R1 as well as the swingarm to something a bit more modern. With the swingarm swap, I will have to rig a jackshaft up to adjust for the wider tire clearance.

I have the basic idea, but I want some feedback from you guys. A lot of you have a lot more experience in this field and theres a chance I am overlooking something.


This is what the bike currently looks like:



Any help, suggestions, ideas or the like would be appreciated.
 

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How much more of the tail can be chopped off before you're sitting on the rear tire? haha

Anyway, sounds like you have a general plan. That's the key to fighters, there is no specific style or wrong way to build one.

A word of caution on rigging up jackshafts- this is a little trickier than you might think. It's certainly possible, but it has to be extremely strong and well supported, and you'll need some sort of tensioner for both the primary and final chains. It's a hassle, I had to rig one up on my minibike at that was only 15hp and I kept bending mounts and snapping welds when I'd catch air and land it still on the power.

If possible, I'd try to avoid this. Bracing stock swingarms can make a big difference, as does getting radial tires instead of the bias play I'm sure that bike originally came with. The advent of the maxi-scooters has led to radial tires being made in smaller and skinnier sizes, that now fit older bikes that previously needed wheel swaps to run radials.

Anyway there's plenty of help here and I'm sure tons of cb750 knowledge floating around the internet. Welcome aboard and good luck.
 

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Discussion Starter · #3 ·
With regard to the rear being chopped, Im talking about cutting the seat support off from the cradle and installing a complete sport subframe... seat and all.
The jackshaft will be made with the utmost care and no expenses spared there. The bike currently has a 130 rear tire. 130 is about the size of most new front tires.. just looks a bit silly, especially given how wide the motor and tank are. I would really like to get it to a 180 (like my wifes 650r) or 200. Doesn't need to be larger than that. Plus a more modern swingarm should be significantly lighter. That swap will happen later down the road after I figure out tolerances on the jackshaft and all that will be involved, as well as go through it with my welder and make sure he knows whats going on.
Also, the bike currently has radials. First thing I changed. I don't like bias ply tires on anything.

Appreciate the feedback, keep it coming. Constructive or not, Im trying to figure out what everyone thinks about this.
 
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