Bike Rattling sound 08 yz450

7 replies to this topic
  • silentZ

Posted April 16, 2009 - 07:59 AM


I was at the track this weekend and my friend's wife was watching us ride and she said that my bike sounded different than everyone else's. She said it sounded like something was rattling. I think it may be the chain slack, but as far as I can tell, the slack is within spec. It's an O ring chain. Does anyone know the actual measurement on distance from the chain guide to the bottom of the chain? Also, I am running Ironman sprockets.

thanks for any help

  • mitchicle

Posted April 16, 2009 - 08:55 AM


http://www.thumperta...ght=chain slack

  • grayracer513

Posted April 16, 2009 - 08:59 AM


Does anyone know the actual measurement on distance from the chain guide to the bottom of the chain?

1.9~2.3" from the rear slider bolt to the bottom of the lifted chain, measured with the rear wheel off the ground.

It's in your manual.

  • silentZ

Posted April 16, 2009 - 11:49 AM


Thank you!

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  • MikeyT750

Posted April 16, 2009 - 04:59 PM


I want to bet it is not ratteling but the special noise is the Slapping chain. Just a thought. I went through it and then got a non o ring. MUCH O BETTER O

  • silentZ

Posted April 16, 2009 - 06:46 PM


I meausred it and it came out to be 2" exactly. So you're saying that replacing the O ring chain with a non O ring will stop the slap sound? I will replace them all as a unit, but there is little wear and since Ironmans last a long time, I will not be replacing them soon.

  • grayracer513

Posted April 16, 2009 - 07:48 PM


O-ring to non-sealed or vice-versa will not stop the slapping. Real chain slap typically occurs when you ride at low rpm/heavy throttle, "lugging" it.

  • Kawirider37

Posted April 18, 2009 - 09:45 AM


I have the chain slap when I'm doing just what gray racer mentioned. Lugging it. Usualy it;s when I pull on the track in 2nd gear at a low speed. I did have a jingle noise that I found to be the top nut on the shock. The top one of two that you use to adjust the rear shock. It came loose and was rattling when I hit the throttle.

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