2003 Yz450f 4th gear

2 replies to this topic
  • motocrazy2006

Posted July 18, 2014 - 11:22 AM


picked up a 03 yz450... slips in 4th gear.. from what I have read its a common thing. my question is, once I tear it apart. do I order oem parts or find a used tranny off ebay? is there an update kit to prevent this or just something that happens?

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

Posted July 18, 2014 - 06:30 PM


I also just got a YZ450f 2005 model with the same problem and based on my research on this site and others there is probably a broke tooth off of your 4th gear pinion and or maybe a bent shift fork....might as well crack the cases apart to see first. I'm going to tear into mine next week hopefully. There are numorous gear sets on e-bay ranging from 89-150.00 and the shift fors set runs 35-40.00 range.....Just one gear is 75.00 new. I haven't heard of any unrepairable trannies yet so good luck.

Edited by nohope, July 18, 2014 - 06:34 PM.

  • grayracer513

Posted July 19, 2014 - 07:13 AM


Not a broken tooth.  The problem will be wear or damage at the locking lugs ("dogs") on the sides of the gears involved, 3rd and 4th on the main shaft, in this case.  The fork will have been bent by the skipping in/out.

Related Content


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

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

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

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 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.