GL1000 front end swap. Nice spokes with twin discs. That's what you'll want once you've installed the turbo.
not really...while the GL1000 swap is ideal for a SOHC because it is totally a bolt it, for the DOHC it is not as simple and frankly it is old technology. What is great about the DOHC bikes is that motorcycle brakes took a huge leap forward while the DOHC bike was in prodcution. The GL1000 front end is heavy, very heavy, but it is basically the only commonly available option for a SOHC bolt on dual disc while retaining a speedo drive. The DOHC front ends do not bolt on the SOHC so the first year GL1000 swap is basically it.
At one point I owned a 1979 and a 1982 cb750F. Identical bikes, identical engine performance, identical weight but the later had improved brakes and rear shocks. With me riding both in the same day the 82 stopped way better than 79. The reason is that the 79 had single hockey puck calipers while the 82 had twin piston tokico calipers.
The best brake setup irrespective of rims for any DOHC cb is the 1982/83 cb1100F front end: 39mm tubes (lighter than the GL1000 and 2mm bigger) and the heavy duty tokico twin calipers. Some of the later 750s and early 900s have 37mm tubes which is the same size as a gl1000 and have the heavy duty calipers. The only down side is you are stuck with a comstar. Some of the K bike comstars are larger than the C bike comstar (18" rather than 16"), and the same goes for the spoke rims (first year customs came with spoke rims also).
I head some old timers talk about using gs750 (1977-1978) rear swingarm and rim to do a rear spoke conversion with a disc brake. I have not tried it but I have a 1977 GS with a rear disc spoke rim, if you want me to take measurements I can.
Also since you are asking about cb750 DOHC upgrades, the 900s came with an oil cooler from the factory that should retrofit to the 750.
now If I was going to built the ultimate K bike DOHC (money no object, performance the ultimate goal) I would start with a cb750F frame (stronger and better braced) and a cb1100F engine, cb1100F aluminum rear swingarm, rim, and disc brake setup (with 160 rear tire) and a 1982 cb1100F front end and stock K bike bodywork.
Turbo kits for the DOHC are commonly available in europe, although the US market for it has dried up. I have ridden a turboed cb900 once and it was a monster with no street manners whatsoever, but when you carry that big of a stick who needs manners.
Edited by - geeto67 on Aug 11 2006 3:43:39 PM