2001 YZ426 Clunking from right side of motor

2 replies to this topic
  • J_B

Posted April 09, 2014 - 06:46 PM


I recently purchase a 2001 YZ426 that did not run. Took it to Yamaha and asked them to go completely through it, ultimately they rebuilt carb, changed oil, adjusted valves, flushed radiator, serviced air filter, etc. I took it out and noticed a pretty significant clunking at idle and low RPM, goes away with some throttle, runs strong with massive torque, starts on 1 or 2 kick every time. Haven't owned a thumper before. Wanted to see if this is normal before I take it back to the shop.

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

Posted April 10, 2014 - 03:17 PM


You sure that is a 2001? Cause the 2000 model had a key holding the balancer gear in the right place.  If the crank gear nut gets loose, they start rattling around and the beat up their groove and get noisy.  They're pretty noisy anyhow, you know?  Maybe open it up and look. 

  • J_B

Posted April 10, 2014 - 04:52 PM


I am positive it's a 2001. Guess I will have them look at it. Just thinking they would not have turned it back to me if the clunking was something serious. They claimed to go through it thoroughly. I may be being overly cautious but the clanking sounds like a rod knocking in a car.

Related Content


Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies

Megabomb Fitment by 288yz450

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

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 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.