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    high idle

    5 replies
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    • Member since
      December 2015
    high idle
    Posted by bigangel4 on Monday, December 14, 2015 11:33 PM

    so i have a 98 yamaha mm 700, i just went through the carbs , completely cleared both jets , checked floats and checked reeds which looked fine, i put it all back together made sure the boots are perfect, everything is put back together just how i took it apart, it starts up great but slowly revs up to 4000 rpm's and does not come down when warmed up, when i pull out the choke slightly the idle goes back down to normal. please help

    • Member since
      June 2006
    Posted by jabber on Tuesday, December 15, 2015 8:29 PM

    Re clean the carbs.. Common problem on yammies when pilot cct is plugged.. Soak the carbs and then blow compressed air through all passages.. 

    • Member since
      August 2005
    Posted by bman on Wednesday, December 16, 2015 2:55 PM

    Carbs in sync. Check crank seals

    • Member since
      July 2005
    Posted by Dick from Wellston on Friday, December 18, 2015 7:54 AM

    Start motor, spray carb cleaner around the motor, carbs, base gasket , intake and crank seals. When you hit a spot that the rpm changes, that is where your problem is.

    • Member since
      March 2008
    Posted by m-m racing on Saturday, December 19, 2015 6:08 PM

    sounds like it needs more fuel or a smaller air jet


    • Member since
      June 2006
    Posted by jabber on Sunday, December 20, 2015 8:24 AM

    No air jet on those carbs. Its a fuel jet..  Been though this will alot of guys in the past and almost every time it was a dirty carb still. 

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