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Sportman 700 wont rev out and fells lumpy wont tick over properly wont cross 40 mph

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  • david bolger Dec 29, 2010

    was told the diafram in carb could be bust what ar the chances of this thanks dave


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First get the voltage of the battery checked. If battery is showing proper voltage then check the limiter nut on the primary clutch. Sometimes they back off and don't let the clutch shift all the way out. Also have you checked the belt to make sure is not wore out? Check the plastic nut in the primary clutch.Also check the fuel line and fuel pressure.If fuel line is kinked or blocked or if fuel pressure is low,then it can cause this problems.-----------This should help.Thanks.Helpmech.

Posted on Dec 29, 2010

  • raj somaiya Dec 29, 2010

    Can be possible,check the carb boot between the carb and the motor. These things are notorious for cracking on the bottom side where you cant see it.
    ----------------In service manual,for this problem it says:---
    From service manual - Engine idles but will not rev up
    Spark plug fouled/weak spark.
    Broken throttle cable.
    Obstruction in air intake.
    Air box removed ( reinstall all intake components ).
    Incorrect battery connection or battery low on charge.
    ETC switch limiting speed.
    Reverse speed limiter limiting speed.
    Caruretor vacuum slide sticking/diaphragm damaged.
    Incorrect ignition timing.
    Restricted exhaust system.
    Also check the air flow mixture.there is a screw to adjust access the screw you have to drill the the brass cap off the bottom side of carb.
    If drilling out plug ,be careful,use small bit dont drill too deep or can damage fuel/air screw,then use a screw in plug and pull out. COUNT number of turns clockwise till lightly seats,make adjustments from there.------------------- This should help.thanks.Helpmech.


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