Bought this machine last year it has a welded sump and inlet for the carbs was going to take the engine apart but unsure what CC it's and can I get parts for it this bike was used for central road racing in America. It starts and runs don't want to change it much just like to use it once in a while.
This is it on YouTube.
The 1981 Kawasaki KZ750M Former AMA Cup Bike is b…:
That is a sweet bike. I commend you for not changing it much, a bike with history like that is rare and authentic. Unfortunately there aren't alot of parts for these old twins. Your best chance of scoring engine parts is ebay sometimes piston rings and the like pop up. That bike is almost for sure bored over, it may be very difficult to find rings for aftermarket pistons. even finding the 32mm shims can be tough. Whats wrong with the bike? it appears to be running well in some of the videos. I would just clean it up and ride it till the wheels fall off.