cr250dave

Member
Jun 25, 2005
13
0
I have an 03 cr250 that I just put a wiseco piston in. It starts fine and idles good but when going to start breaking it in I noticed that there is a knocking noise after I roll off the throttle. It only does it when the rpms start coming back down and it is not consistant. I will knock a couple times and then stop. I was real careful during the install and did it all by the book. Any advice would be great.

Thanks,
Dave
 

ellandoh

dismount art student
~SPONSOR~
Mi. Trail Riders
Aug 29, 2004
2,958
0
possible lean condition????
 

bclapham

LIFETIME SPONSOR
Nov 5, 2001
4,340
0
sounds like an air leak- maybe buy another base gasket and double check the sealing surfaces.

check the manifold and carb is bolteted up OK also.
 

cr250dave

Member
Jun 25, 2005
13
0
Pre mix was the same and new gas. I richened up the needle and the main jet and took it out today. It sounded great I thought I had it rich enough before but I guess not. Anyway thanks for the help guys its all broken in now.
 

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