idle problems

2 replies to this topic
  • danny-goddard

Posted May 29, 2007 - 10:49 PM


hi there ive been having some problems with my 426. firstly its been through 3 plugs in 4 weeks:mad: i fitted a new plug yesterday and she fired stright up:ride: once i take the choke off it ticks over nice for about 1 min then the revs start to climb up and up. once they stop climbing they wont come back down until i adjust the idle screw. then it just cuts out:foul: could this be a carb fault?? not sure so please help:confused: cheers danny

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • PatrickM

Posted May 30, 2007 - 02:25 AM


My YZ400 did the same thing. The only thing my bike did not do was the climbing of the idle. my idle was super high as if the choke was alaways on (even though i cut the choke off). I took it to as Yamaha service shop and they found a whole bunch of parts in my carb that were working (the float in the carb's bowl and some needle valve).....

They are fixing it as we speak..... they service guy called me and said that the carb was so dirty that he was surprised the bike would even start (even with the broken parts in the carb)

If i were you, I would check the carb and see if it needs some TLC

I hope this helps.

Patrick M.

  • jbrooks26

Posted May 30, 2007 - 04:18 AM


Sounds like it is time for a good cleaning. You have a plugged jet somewhere. Take it apart and pay particular attention to the orientation of the throttle slide and plate if you remove them. Blow some carb cleaner through all of the fuel passages and jets to be sure they are clear. While you are in there take note of all of the jet sizes for furture reference. Also, while you are at it, make sure your air cleaner is clean and not all plugged up with crap. Hope this helps.


Related Content


YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.