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polaris 550

  1. Polaris 550 (2009) starts fine but won't idle

    Polaris Sportsman
    I've checked everything so far, including new EFI module, new throttle body, new spark plug, new intake gasket, adjusting valve lash, checked compression (~100 psi) and so far no luck. The engine starts find and idles great at ~1800 rpm for about 30 seconds then starts to slow down as it warms...
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