Late CB750?

[Bonez]

Well I was attracted to the big DOHC tilted forwards donk and thinking hmmmm... that looks a bit (if you squint) like a 60's Honda factory racer engine and since they are CHEAP and other donors for a cafe racer are NOT cheap I went... hmmmm!

Cheap is good . Shit forgot all about the 750C. That would be a great basis for a cafe racer. http://stever.ca/other-stuff/cool-cb750-cafe-racer/

[Pedrostt500]

I had a 1980 CB 750 K in the early 90s, it had a horible primary chain knock at idle, got a price from a mate to rebuild the motor, was cheaper to buy a new bike, doubt its got any cheaper to rebuild one of these motors.

[pete376403]

The "twin-cam-four-valve" thing was more of a marketing exercise than an attempt to make serious power. The angle between the inlet and exhaust valves was too wide, which made the combustion chamber too big, so the pistons had to have high domes to get decent compression. This resulted in a long thin chamber which didn't burn fuel as well as a more compact chamber. The previous single cam two valve 750s made more power.
Well that's what Kevin Cameron reckoned when they came out, anyway.

[Howie]

Shit that brings back Memories. I had a CB900F back in the very early eighties, as to reliability I only had a couple of problems with it. First one was that it developed a slight ticking noise in the engine when I was about 400km from home. I thought it was that it needed the valve clearances checked.(which are a shim type) Turned out the cam chain guide for the chain connecting the two cams had cracked and a little bit of it was rubbing on the chain and I got to within about 20km of home before it broke a little bit off, which broke the connecting chain. which dropped into the one connecting to the crank, which also broke. End result new chains, Temsioner’s, sprockets, and 8 bent valves.(warranty claim) Lesson learnt check out those strange noises. The other problem was after a medium speed drop on the right hand side,(black ice) which it turns out bent the crankshaft, end result of that was a broken crank. Other than that it was a great bike, and took me quite a few places around NZ.
I think I still have a Haynes manual in the shed for the CB750-900 from the late 70’s/ early eighties.

[What?]

I had a CB750FC - 1982. Great bike (in the day), albeit needing regular and carful maintenance (esp. cam chain tension). Traded it on a CB1100 that I still own (Yeah, yeah...)

I have got a rear wheel c/w disc and cush drive off another 750FC if anyone wants it.