valve shim diameter??

2 replies to this topic
  • Mike_Walsh

Posted July 17, 2002 - 02:53 PM


I picked up some shims at the dealer today. The shims that they gave me are about 3/4 the diameter of the originals. The move around on top of the valves instead of fitting tight. Will these shims work? Or should I find the correct ones. I had to drive an hour to get these



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

Posted July 17, 2002 - 03:27 PM


I wouldn't use anything other than OEM for your bike. If they are not exactly like the ones in the bike they probably are not right.

  • #302

Posted July 17, 2002 - 04:53 PM


on the '98-'99 version of the yz400 the ouside diameter is 9.5mm. On the '00 and up models have a small outside diameter. I'm guessing that you have a 400, and the person working at the parts counter probably gave you a shim for a 426 thinking there are the same. There are good aftermarket shims out there, but it is very important that they fit properly. Also when you are re-assembling your motor place the shims on the valve so you can read the number. It will help for the next time you adjust your valves. :)

Related Content


Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

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

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

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 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.