Fouling plugs

7 replies to this topic
  • FOX426

Posted January 13, 2002 - 06:39 PM


My bike is a 2000 426, I have always run plugs for at least 25 hrs before changing them. Now all of a sudden they are fouling about every 4 hours. Whats going on? I have made no changes to the carb. Weather a little colder, maybe?

  • michmex

Posted November 27, 2006 - 11:06 AM


buddy i am haveing the same problem

  • Milhaus

Posted November 27, 2006 - 10:53 PM


I was having the same thing happen to me until I cleaned the carb thoroughly. I had some gas go bad and gel up in the carb. Second, I added a J.D. jetting kit and haven't had a fouled plug since.

  • michmex

Posted November 28, 2006 - 10:25 AM


i have a shop go though my shit every year and they still cant find out but they love the bike

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • big nate30

Posted November 28, 2006 - 08:19 PM


just getting back into riding bought a 426 01 was hard to sart at first than fouled the plug after 10hrs put a ngk 1275 cr8e plug in it starts after 3 to 4 kicks cold ever time this plug has about 8hrs on it

  • muffinman

Posted November 28, 2006 - 10:58 PM


dirty fuel or just old fuel, try to leave the bike tank empty between rides, full with fresh premium and clean air filter, also ensure air filter not over oiled.if youve got a large can of fuel donate to lawn mower:cry: i had this exact issue but all fixed now thats all it was:ride:

  • FOX426

Posted November 29, 2006 - 08:00 AM


I was just curious how this old post from 2002 was regenerated?:worthy:

  • 642MX

Posted November 29, 2006 - 10:41 AM


I was just curious how this old post from 2002 was regenerated?:worthy:

I have no idea. But while we're at it.....did you ever get your bike fixed?

Related Content


Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

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

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 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.