77KZ650 wrote:
If you swap to the 750 top end, you will need to swap cam sprockets with your 650. the early 650s use a roller chain, while the 750s use a hyvo. using the 650 "roller" sprockets on the 750 cams is how you make your crank work with the 750 stuff. and yes you will need to enlarge the holes in the case to fit the larger sleeves, its not hard.
Hey medic24.
77kz650 is correct on the swap as I just did this and it is pretty much a bolt on.
If you retain the 650 roller cam chain after swapping 650 sprockets onto the 750 cams, you should also keep the 650 cam chain adjuster that is mounted on the back of the cylinders under the carbs.
You might want to also look at the carb issue. If you are keeping the stock 650 carbs you may have to rejet the 650 carbs to compensate for the extra displacement. Of course, then you will want to bore the 750 to 810, mill, port and polish the 750 head etc....
Cheers-Colin Firth-Ontario Canada
1977 Kz 650 Custom with 14,000 miles. Wiseco 810, WG Mikuni 28's and lottsa go-fast goodies.