Join Date: Oct 2011
Location: Gatineau, QC
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turn off fuel lever, remove both plugs, stand back and pull it over....the cylinders may be full of fuel from having no spark. If this is the case keep pulling until both cylinders are clear. Next remove the pipe and drain fuel as there may be a boat load inside and like scrammy said, remove both crank case plugs located on the bottom front near the engine plate and drain fluid. I think the crank case plugs are 7mm or something in that range and let us know the result
Sounds like you've fixed the coolant issue so..
Often, the last thing you did, or things around the last thing you did are the culprits when a "sudden" problem shows up.
I would definitely look into the timing issue since you replaced the stator recently.
If you're finding fuel in the crank case....(depending on how much), you may have a "rich" condition. Double check the cleanliness of the carbs and pay extra attention to the choke and floats. Make sure the floats are not leaking and that they are level when you hold the carb upside down. Make sure you are using fresh gas. Snowmobiles are absolutely notorious for being picky about old gas or water in the gas.
Again, if it ran good before and you changed the stator, I'm leaning towards timing but checking the fuel system is just good measure and rules it out.