Question about Polaris ATV
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Posted on Jan 02, 2017
If you have gone through the carburetor and your atv still won't rev it sounds like the exhaust lobe on the camshaft is going flat. They have an overhead camshaft in the 500 motor and the exhaust lobes seem to wear down if the oil is broken down (gas in oil) or if the wrong oil is used. Easy way to tell is to remove the 8 screws on valve cover and the spark plug. Then remove the 4 screws holding down the rocker arms. Once the rocker arms are removed you can see the camshaft, pull on the recoil rope to rotate engine until the lobes are facing upward. The two outer lobes are the intake lobes, and the center is the exhaust lobe. If the exhaust is worn, you will definitely be able to tell because it should be about the same height as the intake. Or if you don't feel comfortable doing that I would recommend a reputable repair shop. Hope this helps, and if you need more help let me know, Daniel.
Posted on Sep 30, 2011
Here's a link that should help you.
Posted on Jan 22, 2016
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