Engine Rattle 2000 yz426

6 replies to this topic
  • doitmerm

Posted February 02, 2008 - 10:01 PM


While riding today I heard a rattling noise as I would release the clutch only in 1st and 2nd gears. It sounded like it was coming from the left hand side,but I really could not pin point it for sure. Kind of a vague question, but any insight would be appreciated.

  • grayracer513

Posted February 02, 2008 - 10:45 PM


Do you mean when you are releasing the lever (engaging the clutch)?

  • doitmerm

Posted February 03, 2008 - 08:34 AM


yes. When engaging the clutch and I forgot to mention heard it mostly at low RPMs in 1st and 2nd gear.

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  • grayracer513

Posted February 03, 2008 - 01:07 PM


If you can duplicate the noise just by letting the speed drop off to a low rpm and applying a load, it's probably chain slap (the rear chain slapping the swing arm slider because of the time between power pulses with the single cylinder engine)

  • ml795

Posted February 03, 2008 - 01:13 PM


check clutch plates

  • yz4fun

Posted February 03, 2008 - 09:31 PM


The annoying chain slap,I get that noise on mine all the time,even with tension adjusted proper.It does the same on my 250 also :busted:


Posted February 04, 2008 - 01:18 AM


Do you have a McGiver friend that comes over to fix your bike? If so, call him to look it over.

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