Jumped Timing?


1 reply to this topic
  • joehonee

Posted January 16, 2010 - 02:53 AM

#1

While doing a tuneup on a recently purchased 01 YZ426 I checked the valve clearances and they were fine. When I moved onto the cam timing check however, I ran into a little problem. The intake cam was off 2 teeth and the exaust was off 1. I have corrected the problem but am trying to determine what caused it. Previous owner/mechanic error or is there an underlying issue with the engine. The tensionor operates well.

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

Posted January 16, 2010 - 08:50 AM

#2

WHen you did the re-timing, you should have checked the condition of the cam caps and saddles for evidence of the cams having seized, and also for signs of kinking, binding links in the cam chain. Otherwise, it's possible that the cam chain is simply too long, or that the sprocket on the crank axle is worn.





Related Content

Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
Forums
Photo

YZ450F 03 Sparks driving me crazy by SirAttard


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
 
x

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.