[hanginon]

does anybodys 450X make a knocking or slapping sound at idle, mine has since they fired it up at the dealership when i bought it new. it goes away as soon as you give it gas. I figured it was just the high compression engine is a little noisey, but the fact that it has no factorry warranty scares me. I have put a couple hundred miles on it and the valves are within tolerances

[JAWS]

These things all sound like a thrashing machine. If you put an aluminum skid pan on, it get worse. Not to worry. Ride it like you stole it.

Joe

[04 crf450]

my 450's do the same thing at idle

[Halen]

Try increasing your idle by a hair. My (250X) ran a little on the slow side causing the decompression to engage slightly. It sounded like a little man was inside the engine with a hammer... trying to get out.
Halen.

[hanginon]

I sure appreciate the feedback I'll sleep a little easier now. can't wait for the snow to be gone , Thank you