That sounds pretty cool, you never mentioned you were building a heavy bike. I have a cylinder bored to 1065?
I specialize in Kawasaki air cooled 4 strokes from the seventies and early eighties 550-1100 .I also network with others and can search for parts on your behalf .
The core of the motor I need to swap the parts onto was an ex AHRMA engine with about 6 races on it and he was running Omega pistons on stock bore so I'm hoping that will do for a while. I don't want to go too crazy on the motor as its only for Endurance.