Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums - View Single Post - Loud knock coming from engine
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post #3 of (permalink) Old 06-29-2006, 04:55 PM
cegodsey
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Take the one of the plugs outta each cylinder, and see if you can see anything, like damage. Might take the left side cover off and turn the engine manually (CCW, I think), and see if you can see the valves. It would help if you had a boroscope! If it's a valve hitting the cylinder, you should be able to see an impact point on the piston, and maybe a damaged valve. But if the bike appears to be running OK other than the noise, it may be deep in the bowels of the crankcase.

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