Chain Tension on a 426

8 replies to this topic
  • beasleys

Posted April 21, 2005 - 01:26 PM


What is the correct way to set the proper chain tension on my 01 426? I set it with two fingers on top of the swingarm but when I do that it makes a poping noise when getting on the power in first or second. I think the noise is the chain slapping the swingarm. When I adjust the slack out enough for the noise to stop then the chain is pretty tight towards the bottom of the suspension stroke. What is the right way?

  • 02YZ426

Posted April 21, 2005 - 01:32 PM


I like to have 3 fingers slack in the chain right behind the guide. How old is your chain+Sprockets? If they are worn, the chain will chatter more. I found a big difference when I went to an o-ring chain, there was alot less chain noise.

  • grayracer513

Posted April 21, 2005 - 01:37 PM


I believe the spec is 1 5/8" or 1 3/4" with the wheel hanging free. It's important to set it while it's on a stand, because the spec takes into account the slack taken up by the lower roller.

Chain slap at low RPM is pretty normal.

  • beasleys

Posted April 22, 2005 - 05:44 AM


The chain, front sprocket, and rear sprocket all only have approx 10 hours on them. I replaced them all as a set.

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  • Matt96xr6

Posted April 22, 2005 - 06:21 AM


2-3 fingers at the last bolt on the chain slide. That is where you measure it. I usually set it about 2.5, just where I cannot get the 3rd finger under there.

  • Daz_426_02

Posted April 22, 2005 - 07:07 AM


I would defiantly agree with the O-Ring Chain being much quieter !!

  • mark794

Posted April 22, 2005 - 09:57 PM


Its gonna slap in the lower gears even when adjusted right. Keep an eye on the guides to make sure its not wearing through. Motoman has a pretty good article on it on his web site @
An O Ring Chain worked better for me.

  • Satch0922

Posted April 23, 2005 - 05:38 AM


doesnt the shop manual say 1.7-2.0 inches of play ?

  • Satch0922

Posted April 23, 2005 - 05:43 AM


sorry... 1.6-2.0 inches of play per the manual

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