'03 YZ450F Starter shaft issue?

No replies to this topic
  • maffud

Posted January 28, 2006 - 02:55 PM


I am wondering if there is a known issue with the starter crank shaft on the '03 YZ450F. I have a friend who has two of these bikes (one for him and one for his son). His son (16 yrs old) broke the starter shaft on his bike a couple of weeks ago, and then he broke the same part on his bike yesterday. I have the same bike, too, but I have yet to have a similar problem.

It looks to me like the kick crank lever is designed to meet the side of the foot peg at the bottom of the stroke. If you kicked really hard, this contact point would act as a fulcrum and put extra bending (as opposed to rotational) stress on the shaft. Could this be the problem? Are these guys just kicking it too hard, or is this a common problem with this bike, or what?
Anyone else with the same experience or advice for avoiding this problem?


Related Content


First Hare scramble tips by dhend8

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

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

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

Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

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
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 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.