Sorry I cant answer your question I'm asking one lol.
I'm assuming the KMP3 can bolt up to the newer engine so can't you use the previous g/box?. Trust its not knackered, the g/box on our old ysm8 is bulletproof, way over-engineered IMO but I'm not an engineer
, just comparing its gearbox
to motorcycles from my youth it appears to be huge.
Following with interest.