Hi guys I have blown my piston is there different pistons for the long and short rod engines. My engine is long rod I bought a trx piston but gudgeon to gudeon the piston I've taken out is quite a bit taller that the wiseco I've bought for it. Could the damaged piston be a yz250 piston if so what year of piston would it be thanks
Thanks for your help it is running a Base plate and double gaskets when I stripped it. I bought 2 rebuilt engines one of which was ct 330 the other was supposed to be a 1988. From what I see it's more of a 86 piston I will get more pics tomorrow thanks again.
Sounds like an Long Rod '86 Motor.....SO the Piston & Cylinder are from an '86 and the Connecting rod is from a '87-'89 which requires the 2 Gaskets & 0.190" Space Plate to take into account the change in piston pin height between those years,
If the Cylinder is a '88......then just run that NEW piston you have with 1 base gasket and NO SPACER PLATE.