2004 yz450f jumped timing wrecked top end.

2 replies to this topic
  • Yamifoxracing

Posted July 24, 2015 - 05:31 PM


Hi everybody its my first post on thumpertalk and my yz450 jumped timing breaking off a intake valve and exhaust valve.My question is what would make the timing chain go bad so quickly? I had the bike apart 15 hours ago (3 oil changes ago) and the timing chain looked perfect and felt great, no kinks etc. I thought maybe my tensioner went bad but it seems to be working fine and now i need to buy a whole top end just because of a 30$ part that went bad.
Any feedback is appreciated. Thanks

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • billygildark5007

Posted July 24, 2015 - 08:02 PM


Ouch sorry it's happened to all of us. The chains do go bad over time.
Also look at the gears on the cams and crank to see if their worn and that's why it skipped.
There's many here that can anwser your questions, good luck in your rebuild.

  • Yamifoxracing

Posted July 26, 2015 - 10:22 AM


Yeah. Thanks for the tip billy. Looks like im gonna buy a heavy duty timing chain so this doesnt happen again anytime soon.

Related Content


James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

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

First Hare scramble tips by dhend8

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

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Megabomb Fitment by 288yz450

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

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.