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I have a 96 polaris 400 sport 2 stroke that I just got and replaced water pump and oil pump seals and bearing. Drove it for a couple of hours, parked it. Started right up next day easy as pie and rode an hour and it ran strong and then it started loosing power so I shut it down right away. Then, it started super hard and died again. Now it won't start. Not even when i spray starter fluid in carb or cylinder. (I know this is not a great idea but I figured if it fired it would rule out bad gas because it has spark)' I pulled case back off to make sure the stater didn't come loose and effect timing and found oil in the flywheel compartment. I am pretty sure it is the crank seal because I accidentally poked it and slightly dented it with a screw driver. Before removing the case to find the oil, I put a compression tester on it and I am getting about 70lbs with pull rope and 50 with electric start. Would the crank seal possibly be the issue or is it more than likely top end? Obviously I need a new seal, just wanting to know what I am dealing with. Thanks in advance for any advice given.
 

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Welcome to the board!:med:
 

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Time for a rebuild. Never going to run on that.
 

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if the crank seal is bad it will suck air there causing it to run lean and burn itself up (seize). when it was loosing power it was seizing. Time for a teardown and rebuild and replace those crank seals too.
 
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