i pretty sure the new one is 87-89 style. the old piston is a 86 style.
it would appear it is.It's a good possibility he didn't. So my old piston is 4 sure a 86 right?
i had a R motor with a 89 bottom and a 86 bottom an rod. the motor have 5 or 6 gears? maybe your is the same
this make no sence but i will give it a shot. all atc/trx have 6 speeds. if you are say you had 89 trans and 86 crank that possible or the other way around. but you can't have part 86 trans and part 89 trans, its impossible
sorry i mean the top end was a 86 the bottom was a 89 5 speed.