over bore

[k2000x]

ive got the 75mm one...it doesnt have any cut aways and has a little longer skirt so it will need to be trimmed off....the 75mm piston was from a 650 twin jet ski the 440 big bore piston is 73mm and looks the same no windows in piston...i havent got one so im going to surf u.s ebay for a used one to tinker with....the reason 4 the idea was that there was a vb 250 cylinder and jet ski piston set up, on u.s ebay months ago but i wrote to the guy to talk about it but, no reply

[cappra]

I think that was Randy Lewis in Bakersfield, California.  He's not computer savy, so I'm not suprised he didn't get back to you.
I do know that he used a jet ski piston in his 250 VB and as I recall, he told me he had to use an aluminum spacer under
cylinder to raise it up.  He also was able to bore the cylinder out and fit a Cota 348 piston, and it came out to around 300cc.