09 YZ450 transmission problem

2 replies to this topic
  • Madg11

Posted September 10, 2011 - 01:32 AM


Hi guys,
My 09 YZ450 is feels like it jumping the gear in 5th under power. I feels like the chain is jumping the sprocket (its definately not) thats about the only way i can describe the issue. I have been getting alot of false neutrals and the issue is getting worse, both neutral and the jumping.
I cant use 5th at all Really.
Any help or advice would be greatly appreciated.

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

Posted September 10, 2011 - 08:06 AM


The locking lugs on the sides of the 3rd and 5th gear pinions (gears on the main shaft) are rounded from wear, and no longer have the undercut on them that makes them hold in under power. The force of the gears pushing apart from one another will have also bent the forward shift fork, so at minimum, both gears and the fork will need replacement.

Check the bearings carefully, particularly the left side main shaft bearing.

  • Madg11

Posted September 10, 2011 - 11:42 PM


Thanks for the advice. I have been told this is a common problem with the later model YZ's, does this sound right?
Would replacing the gears give me any kind of extended use? I do trail riding only and do like the the motorcrossers, but might be better on an enduro?
Thanks again for the help.

Related Content


Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies

05 yz450f not fast enough by RedeyeYZ

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies

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

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