83 atc 250r piston question

[Hummel]

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]

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]

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]

I think first over is .0010 .

.010 inches or .25 milimeters


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