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Dirt Bike Brands - Other
CRF450R - Big Valve Adjustment
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[QUOTE="cthowards, post: 1162951, member: 67091"] I recently rebuilt the top end on my CRF450R including piston, rings, Kibblewhite valves and springs, etc. I sent the head to a local shop and they installed the valves. The motor has 1.9 hours on it since the rebuild and the last time I rode it ran rough and had popping on decel at the end of the day - seemed to happen suddenly. I checked it over and found that my header bolts were loose allowing the pipe to move around and I thought that was the reason. Winter hit and I have not done anything to the bike since then. Anyways, I am going riding this weekend down in Maryland and expect to put alot of hours on the bike so I decided to check the valves. The left intake valve was .005in when I did the rebuild and now it measures .002in. I did the calculations and determined that I need to remove the 190 shim currently in there and replace it with a 180 shim. The right intake valve and both exhaust valves were right on spec. Can anybody offer explanations as to why I would have such a big adjustment so soon? Should I be concerned and remove the head or simply shim the valve and move on? Thanks for your help. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
CRF450R - Big Valve Adjustment
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