Pull the whole motor down and replace all of the gaskets, hone the cylinders and install new rings. Make sure you use polaris crank case sealer, or threebond 1211 whihc is much better stuff imo. You will need to pull your flywheel and remove the stator to split the cases. Make sure you feel all of your crankbearings, make sure they are all smooth, any gritty or grinding noise will fail pretty quick. In my experience, a crank seal is a sign that a crank bearing is getting sloppy, allowing the crank to wear the seal until it leaks.
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