PDA

View Full Version : 83 atc 250r piston question



Hummel
11-13-2017, 12:56 PM
Hi, i need a new piston and rings. what kind of piston do i buy? what is the first size over std? i know the 1978-80 cr 250 piston will fit but no idea what size i neeed. cylinder has to be done too.
and is there a bearing and seals kit for the bottom end? i have all the gaskets but i want to make it all new since it has to be taken appart anyway. i dont need any tuning.
maybe some parts fit of the cr 250`s engine from 1980? would like to order parts from europe cause the shippping and german taxes will double the price till i have the parts orderd in the US.
thanks Ralf

atc300r
11-13-2017, 01:46 PM
Stock is 70 mill. I think first over is .0010 . Check wiseco or wossner. The cr piston your referring to will also fit. You should measure your bore before ordering a new piston.

Hummel
11-14-2017, 12:05 PM
ok, good to know... measure first! what about the oil seals and o rings in the bottom end, will they also fit of a cr 250 78-80?
i need these needle bearings and crank shaft bearings too.

barnett468
11-14-2017, 11:12 PM
I think first over is .0010 .

.010 inches or .25 milimeters


PREVIOUS KAWASAKI INTERNATIONAL R & D PROJECT ENGINEER AND ATV DEPARTMENT SUPERVISOR AND THE ONLY PERSON ON 3WW WITHOUT AN EDIT BUTTON OR A STAR :Bounce