Kz 750 top end on a 650 bottom?

I have a complete 1981 650csr engine and a spare 750 top end.
I was thinking of putting the 750 top on the 650 bottom so I could
Have a spare engine for my 750e. Will this work? And how do I check
the 750 cylinders condition to see if they are within spec?

geohaydook1 wrote: I have a complete 1981 650csr engine and a spare 750 top end.
I was thinking of putting the 750 top on the 650 bottom so I could
Have a spare engine for my 750e. Will this work? And how do I check
the 750 cylinders condition to see if they are within spec?

Bore specs and measurement procedures are described in the Factory Service Manual.

A KZ750 manual may be downloaded via this link and scrolling down to "The Bible."
kz.bike-night.com/

Good Fortune!

Yes it will bolt right on, assuming you do not have a kick starter.