Question about Polaris New Genuine Polaris Snowmobile Accessories / X Treme Sidecut / Out of Bound

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Polaris rmk 500 backfires when it gets hot then won't start

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Ok this sounds like a similar problem that I have had with a 500xc engine...This engine has been running fine for the last 5 yrs until a few weeks ago when it became a pig to start and when it did only run on one cylinder eventually running on both and when it gets to a certain temp would cut out and then not start again for 5mins, changed everything we could think of, checked compression, barrels fine, carbs clean new cdi, coil, plugs, leads, fuel pump and pipes, then someone came accross with checking the resistance on the temp sensor on the top of the head which were different values to the the book and on another identical engine, I borrowed a spare sensor and although still a pig to start it was an improvement when running, need to buy a new sensor to rule it out
, can anyone else shine some light on this?

Posted on Sep 04, 2009

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Im guessing its a blow piston it could be an antifreeze issue check the thermostat it should be on the head of the engine just remember to tighten the new one to the correct torque specs the back firing sounds like a blown piston check your compresssion

Posted on Aug 14, 2009

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