The Honda Owners Club

I am rebuilding a 1974 cb750 K3. The primary cush drive (sits behind the clutch) sprocket teeth look a bit worn to me. In fact there is no land left at the tooth crown, they are pointed nut not hooked over. Is this normal for these bikes or do i need to get a replacement? if i need a replacement does anyone out there want to sell one?
Incidentally, thanks once again to Kev who sold me an oil pump for this project. it is now installed and all was going well till i hit this snag. My fault for not looking.
cheers
Ian

Replace it. It'll make short work of a new chain. If the rear is the same vintage the wear may not be as prominent due to more teeth. I'll bet your chain is pretty well shot.

If there are visible signs of wear I would replace the sprocket and obviously the primary chain as well "IF" you can source replacement parts. I say if as they are difficult to obtain new and very expensive. Of course if the crankshaft sprocket is worn as well you will be looking at a new crank as well. The primary chain was changed to hy-vo type on the later fours and of course wet sump lubrication was introduced which helped longevity.

Regards

Chimpy

thanks for the response Gents. It's not the rear wheel drive chain i am referring to it is the primary chain running from the crank to the main shaft through the cush drive. The crank teeth are good its the cush drive teeth that look very pointy. I am going to buy a new set of primary chains but was wondering if anyone out there has a second hand primary cush drive they would like to sell ?
thanks
Ian

thanks for the advice, i will have a look. Sorry for the delay in responding as i work away. Anyway i have a bit more time to find one as the primary chains i have ordered are going to take 5 weeks!
cheers
Ian