Idle adjustment problems

3 replies to this topic
  • Jefferted

Posted March 29, 2006 - 06:56 PM


I have an 02 426 and put a Thunder Alley pipe on it awhile back- love it. I rejetted it as recommended and it seemed to be running fine but the idle was a little low so I adjusted the throttle stop screw, seemed perfect after that. Next time I tried to ride it up the street it ran like crap. I can't seem to get it dialed in right. The manual says set the pilot screw to 1 3/8 turns but says nothing about setting the throttle stop screw (the one with the plastic knob on it) after you screw with it and mess things up. I called the local Yamaha service, they said out 1 1/4 turns on the throttle stop screw. I haven't messed with the pilot screw at all. Now it kicks back when I try to start it. I could use a little help here!


  • yzf450jack

Posted March 29, 2006 - 07:34 PM


You have to adjust the fuel screw all the time :thumbsup: like everytime you ride it! If you don't have a ez adjust screw (ty davis or scotts) get one there about $25-30 bucks

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  • jamieyz426f01

Posted March 31, 2006 - 07:53 AM


try turning the idle adjustment screw counter-clockwise, sounds like its too far in(like when you twist the throttle while kicking). just a thought. :thumbsup:

  • jamieyz426f01

Posted April 01, 2006 - 11:19 AM


tried it yet?

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