426 idle problems

5 replies to this topic
  • ezzrigby

Posted May 05, 2008 - 12:24 PM


I have a 01 426 been running badly won't idle off choke at at, striped the card down found nothing but it seems now it will idle off choke still a little rough up and down revs alot, but once i got it to idle i noticed after about a minute the front exhaust pipe went a bright cherry colour. Any ideas? I can't see this being right somehow!!

  • 1998YZ400F

Posted May 05, 2008 - 01:02 PM


ive heard the glowing pipe is a common thing on these bikes and its nothing to worry about.

  • grayracer513

Posted May 05, 2008 - 01:46 PM


You need to familiarize yourself with adjusting the idle mixture:


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • jayh300

Posted May 05, 2008 - 01:53 PM


come on gray...... you know we need to see it every so often...

  • grayracer513

Posted May 05, 2008 - 02:11 PM


What? Evidence that glowing header pipes are not so unusual?


Posted Image

  • jayh300

Posted May 05, 2008 - 02:15 PM


that's the ticket !!!! thanks gray, after a long day at the grind, that pix always makes me laugh...
I would still like a ride in it !!!

Related Content


Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies

BIGBORE FOR YZ450F 2006? by Taattie94

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