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clapping sound
Posted: 08:54 am Jun 02 2011
by casola
When I ride at low load and higher rpm in higher gears I hear a pretty noticeable clapping sound on my 200 with gnarly pipe and was wondering if that is what detonation sounds like from the mid being lean. If I raise the needle it 4 strokes. Un modded carb as well.
Thanks,
Joe
Posted: 09:28 am Jun 02 2011
by KDXrider1989
could be the KIPS
Posted: 10:52 am Jun 02 2011
by Julien D
what grade fuel? What oil? When was the top end last checked?
Posted: 07:45 am Jun 03 2011
by casola
93 fuel 40:1 synthetic. Almost new top end. It's not piston slap for sure. Any other insight?
Posted: 07:54 am Jun 03 2011
by Julien D
You sure you're sure about that? Piston to cylinder clearance was good at last top end I guess? KIPS noise usually lessens or goes away with engine revs. It's pretty difficult to diagnose a noise without hearing it. The brief description certainly sounds like piston slap, or possibly something going south in the bottom end. Rod or mains should be more of a knocking sound than a clap though. Detonation usually sounds like really loud pinging.
Posted: 09:04 am Jun 03 2011
by gregp
Do you know if you installed an A, B, C, or D size piston? I usually shoot for a C or D on well worn cylinders...
Posted: 11:09 am Jun 03 2011
by casola
I know what you mean. Its a weird sound that I cant tell if it is detonation or a reverb from the belly of the gnarly pipe. It's definitely not a rod knock or piston slap and really doesn't have a consistent repetition like piston slap or rod knock. It's such a unique sound that I thought someone may now what I was talking about. A faint clapping sound at higher revs and low load.