cb1100F.net is the forum for DOHC cb750/900/1100F bikes. If it is a C or a K cb750c.com is also a pretty good forum. I actually think the supersport site is a little better than this place because there aren't as many dip#$%*s building bodged together "cafe racers" and there is a heavy influence and focus on making good safe performance modifications.
not that you already haven't but run the opposite direction of the SOHC 750. It will cost you another grand on top of the purchase price to put it right.
The DOHC cb750 is actually a great bike, everything you want the SOHC to be better at it does without giving up much of the SOHC feeling. If possible, look for an F model supersport as they have triple disc brakes. There are 4 things to check on a DOHC cb: the starter clutch, the timing chain, the charging system, and the carbs.
- The starter clutch on these loosen up. it makes a horrible noise. If left neglected it chews up and then it's $90 for new parts from honda.
- The timing chain tension is critical. If left unattended it will tear the cylinder block in half (literally, seen it happen). you'll hear it if the chain is noisy
- Reg/Rect failure on these is common as is pulse ignitors. take a meter and make sure it is charging because if the battery is charged it will run like normal until it dies.
- Carbs on these bikes are the worst design honda has ever made. They are garbage and anytime some hamfisted cafe kid tries to make it better with pods and jetting it makes everything worse. A little throttle lag is normal, but you probably won't feel it unless you are an agressive rider. Make sure carbs are stock.
If you can try to get a 1981-82 model F, they have dual piston calipers which are as good as you are going to get for brakes on these old bikes.
