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Old 07-24-2012, 05:07 PM
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Question Carb Adjustment

On my 99 Sportsman 500 my top end power has been lacking lately, and there has been a significant amount of backfire when decelerating. I expected it to be an air/fuel mixture problem. is there a good diagram anywhere on how to adjust this or does anybody have ideas? Thanks
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2000 Sportsman 500 RSE 4x4 rear seat/toolbox, k/n air filter, ITP MudLite tires
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Old 07-24-2012, 05:57 PM
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Has the cam been changed to the upgraded one yet?
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Old 07-25-2012, 05:24 AM
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To get it to stock settings turn the screw all the way in and back out 2 5/8 turns. A lack of power and backfiring tells me it is lean. Check your spark plug too... white = lean, black = rich. You want it to be a light brown color to be right. I would suggest getting a jet kit and starting from the beginning. (JKP500SPT-1, $48.95 from High Lifter)
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Old 07-25-2012, 05:43 AM
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I second on checking the camshaft. I bet the exhaust lobe is worn. Keeping the oil changed will help prevent premature camshaft failure. Use 0W-40 fully synthetic Polaris or Mobil 1 oil and a good filter(Polaris or WIX,NAPA or Carquest).
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Old 07-25-2012, 08:35 AM
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I have not checked the camshaft yet ( my atv is at the dealer due to the electronics not working) once i get it back i will check the cam and i am ordering a jet kit from high lifter at the moment. Once i get it back i am going to install the jet kit and tune it to my altitude (almost 3500 feet above sea level)
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2000 Sportsman 500 RSE 4x4 rear seat/toolbox, k/n air filter, ITP MudLite tires
2003 Dodge Ram 1500 Reg. cab, short bed, 5.7L HEMI, flow master exhaust, k/n filter, pioneer sound system, JL subwoofer, kicker amp, srt-10 hood, srt-10 wing, 4.56 gears, falken tires, 2-4" lowering kit
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