yz 426 valve clearance

2 replies to this topic
  • amcadavid

Posted June 25, 2006 - 12:33 PM


Advice please,i have just fitted a yz450 exhaust cam in my 426,the inlet cam clearances are spot on but exhaust are a little on the large size, approx .28mm when the manual says .25mm max.Bike now starts real easy (allthough have only just noticed exhaust header glowing red when in work shop)The big question is do i really need to strip and reshim just for the sake of .05mm. Thanks for reading

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted June 25, 2006 - 04:42 PM


Specified clearance is .20-.25mm. Your clearance is .28mm, which is outside that range. So, yes, you really do need to adjust that.

  • amcadavid

Posted July 02, 2006 - 01:45 PM


Rode my bike with new cam in and it felt a little flat,decided to take your wise advice and reshim,it was only then that i noticed that my cam was one tooth out (clockwise),moved it round a notch(anti-clockwise) and now the beast is back in town! thanks

Related Content


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

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

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 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.