Noise from drive sprocket / chain area

3 replies to this topic
  • moon55

Posted June 29, 2009 - 06:43 PM


When I'm at low rpm's in 2nd or 3rd gear and get on the throttle, there is a slapping noise coming from the sprocket / chain area. Chain slack is what is recommended. Any ideas of what this is and how to avoid?:worthy:

  • Aka.Goose

Posted June 29, 2009 - 09:21 PM


Just double check that you have the sprockets aligned well, and that the slack is in fact set right...
Other than that, chain slap is normal...

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  • grayracer513

Posted June 29, 2009 - 10:04 PM


The only way to avoid it is to keep the revs up a bit. It would tend to do this less if the rotating mass of the crank was heavier.

  • Boise93

Posted June 30, 2009 - 12:36 PM


Good to know that this is a normal YZ 450 thing. I was riding with a group a few days ago at the track and they all mentioned that at lower rpms my chain was slapping around and appeared loose. I measured it and it was at 1.9 inches, when the manual recommends 1.8-2.3 inches of slack. Maybe they were just jealous that they were behind me all day and trying to get into my head?!

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