Because the 250/290 stroke is 9.4mm longer than the 125/200, it can not
swapped one for one with a 250/290. If a 9.4mm base spacer could be used, the 200 topend/piston could be used to give 192cc. But I don't know if the port timing would match? This would be a great mod if it would work!
I'm not going to purchase a new bike, and would like to have a "192"
Sherco if if would work out and I'd also have the 250 topend also.
Why, just because and viva la differance!
Yes, I could sell my bike and buy a used 200,,,,,,,,?
Mick