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Engine noise/vibrations and valves

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I just rebuilt my 450 and the engine makes mechanical noises and vibrations that increase at high RPM. EVERYTHING is new, piston, rod, crank, bearings; valves never moved. Took it to an other mechanic to get a second opinion and he says it could be a bad valve shim.

Is that possible? The bike runs fine and starts great too.

thanks in advance

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I think what he means by a bad "valve shim", is loose valve clearance. Not sure what kind of bike you have, but it's easy on any of them to pull the valve cover and check the valve clearance.

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correct, valve clearances were loose and thats what made the engine vibrate and sound like hell.

I cant believe how a bad valve work can make the engine sound like if was going to grenade

thanks for yuor comment walkingwounded

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