06 Yz 450 post rebuild ?'s


2 replies to this topic
  • Yzf_Buz

Posted October 17, 2011 - 06:17 PM

#1

So I just had the bike apart all summer. I had to do a complete motor rebuild, and now that the top end is clacking( it kinda sounds like piston slap in an old 2 stroke) when it is at idle but as soon as it is under load it is going away. I have run the motor for only 15 min and then this sound started. So I promptly shut it down and had it pulled apart to investigate. Now the bike is back together and the sound was gone until it had run in for another 5 min of run time. Any ideas or similar experiences ? Thanks for your input.....:thumbsup:

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  • mark twiggs

Posted October 22, 2011 - 09:10 AM

#2

I had this problem with my YZ250, the power was good but clacked really bad at idle. It was the lower rod bearing. I replaced with new wiseco crank set.

  • Yzf_Buz

Posted November 04, 2011 - 07:42 AM

#3

It turned out to be the wrist pin circlip was not getting seated correctly and was causing the piston to make the noise......





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