426 intake valve sizes

2 replies to this topic
  • 84rm250

Posted December 12, 2009 - 10:02 AM


I beleave, correct me if i'm wrong but on the 3 intake valves the two out side ones are shorter then the inside one..? does anyone know the sizes? i think the longer ones are around 3.32? and short one somwhere like 3.13??

Any help would be awsome, thanks again TT

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

Posted December 12, 2009 - 10:23 AM


Don't know the lengths, but the center is always the shorter one. Due to the dome shape of the the combustion chamber, the center valve seat is higher, and closer to the cam.

  • 84rm250

Posted December 12, 2009 - 10:25 AM


Hmm, guess i was ass backwards. thanks!

Related Content


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

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Help with 2000 yz426 by weekend woods racer

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  36 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.