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Ummmm....Do you not still have to pull off the flywheel and remove the stator plate? I am sure you do. Yes the cylinders do not have to come off but a lot of other stuff needs to be removed.
 

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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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