2008 yz450f rod knocking?

5 replies to this topic
  • yzaddict106

Posted February 27, 2008 - 12:21 PM


Hey guys,
I dont post on here much, but i figured if this has been a problem, you guys on here would know. I have had my 450 for going on 5 months now, and it seems the rod is already knocking. It's completely stock except for a carb mod and suspension. I run a gallon of race gas for ever 4 gallons of 93. I race it in the 450 Int. class, but I've never heard of a bike having rod knocking problems this soon. anyone know if this is common?

  • Justin89

Posted February 27, 2008 - 12:44 PM


If this sound is comming from the top, then it is completely normal. This is a very common issue on here with yz450f especially after 2006. I have a 2006 and when I first hopped on it, it made that noise. I almost freaked but came on here and found out it was normal. Mine did it brand new and still does it today. I dont know the exact reason for this...maybe grayracer or someone could explain it to you in technical terms. Good luck!:smirk:

  • grayracer513

Posted February 27, 2008 - 01:04 PM


More than likely, it's primary gear lash and a variety of other assorted noises, and is completely normal. Go listen to any of them and compare them to yours.

They were designed to be fast, not quiet.

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  • Ga426owner

Posted February 27, 2008 - 01:28 PM


Was this noise there prior? They are noisy as indicated especially w/o a skid plate and foam. If you are uncertain -have the Stealership look it over. Have you checked timing and valves? or had any adjustments to either made prior to the "noise"?

  • todds924

Posted February 27, 2008 - 05:04 PM


I have noticed on my 08 that is is only slightly louder than when new...I have been racing it since last August. It is not as loud as my 06 however.

  • Whyzee429

Posted February 27, 2008 - 05:10 PM


My 06 and now 07 are doing it, but the noises have been there since I got them. It seems like his problem is something new that wasn't there before?!?

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