Here in Michigan we do a lot of sledding. I rebuild and repair a lot of sleds every winter and the one thing i have learned is never buy after market gaskets ...
When you take the motor apart keep the base gaskets that are under the cylinders. The gaskets have a small hole pattern in them which determines the proper squish.
There is probably 10 different thickness base gaskets for every Ski-Doo motor.
If the cylinders are tore up send them to U.S Chrome for replating. Buy your replacement pistons threw them and have them fit whilr the cylinders are there.
Use Weisco pistons , there lighter , forged and probably $200.00 cheaper then the factory ones.
If you have any questions on this topic just email me , i have rebuilt several hundred of them at this point.
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