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I recenly bought a 1997 Polaris Sportsman 500 not running. I try to make it turn with the electric starter with a full charge batterie, but went it turn over the motor stop turning after 2 stroke. I remove the sparkplug and I put my compression tester and first stroke 30 pounds and second stroke 60 pound and then it seem that the compress air wont release. I need to release the air to make it turn again. Do you think that I have a valve or valves stuck?:th_smiliepullhair:
 

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valve stuck

Either cam or valves either way you will have to tear into it is my guess.
 
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They have a compression release so about 60lbs is a healthy motor. Sounds to me more like a weak battery or a worn out exhaust cam lobe not opening the exhaust valves to let it breath. Very common in the pre 01 500 sportsmans.
 

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The automatic compression release (ACR) could be sticking making it hard to turn over. Try pulling the rope start and if it it is extremely difficult that could be it. I think you might need to pull the valve cover and see if the cam lobes are worn. As RVSperformance stated cam lobes are a very common issue with the older 500s.
 
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