couple questions - 99 yz400

2 replies to this topic
  • mediumdaddy

Posted June 15, 2012 - 07:51 AM


So i have a couple quick questions - My front sprocket has a pretty good squeak, and i'm not sure if its the chain or maybe a bearing behind the sprocket? its kind of fleeting though - not exactly regular, but still there either way. what should i look for? And is there somewhere online that i can download a service manual for this bike? preferrably free?

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

Posted June 15, 2012 - 08:28 AM


There is a dust cover over the output shaft seal that may have become bent and could be dragging the sprocket. The sprocket has a wide circular groove cut in one side to clear the extension of the dust cover. This cut out needs to be on the inboard side of the sprocket or the cover will drag on it.

See your other recent post or Common Threads for the manual link.

  • mediumdaddy

Posted June 15, 2012 - 07:49 PM


Ok small update- oiled the chain and that didnt make the squeak any better so just for kicks i sprayed a little wd on the sprocket and it all but stopped the squeak? &%$#@!??

Related Content


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

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

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

YZ450F 03 Sparks driving me crazy by SirAttard

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.