Valve clearance

1 reply to this topic
  • TANKyz450

Posted April 27, 2008 - 07:35 AM


I have a 04 YZ450F, and have only adjusted valves once...2.5 years ago. I checked them again this morning. The middle intake valve is .152, maybe .153. Should I adjust this valve or just keep riding and check again after more riding...or until I break something else that causes me to tear the bike down. I was wondering if tighter side of specs is better than high side since if I re-shim my new setting will be .102 or so.

If you guys think I should adjust, are there any special tools required? It seems like I had to modify a tool to be used on the tensioner but cant remember.

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

Posted April 27, 2008 - 08:00 AM


.002mm is .000078". You may think you can measure in increments that small with a feeler gauge, but you can't. Since you are using English gauges, and the .006" fits, is the .007 tight? If so, leave it alone.

Technically, the tight side of the spec is preferable, but the total range of the tolerance is only .002" anyway. Don't worry about it.

Tools needed are feeler gauges and a good inch/pound 1/4" torque wrench.

Related Content


YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

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

First Hare scramble tips by dhend8

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