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1999 500 Sportsman ATV Runs and idles fine, when excelerating backfires and won't rev up.

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Mine does the same thing chances are that your exhaust lobe on your cam shaft is wore out and also the exhaust rocker arm as well causeing it to back fire into the carburator
parts about 500.00$ labour I dont know

Posted on Dec 04, 2010

  • supermangahn Dec 30, 2010

    i am working on the same machine upon inspection i noticed the intake valves were opening much further than the exhaust when the plug is removed you can see the valves i puled it over until the exhaust valves were closed when slowly pulling over you could see bubbles all around the valves leading me too believe somthing is wrong with cam and valve seats

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