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Message: [QUOTE="phranticness, post: 1016029, member: 66089"] thank you for the imputs, I run 92 octane, I don't believe it's pinging, It's just a noise thats of around the same frequency. I will try a can of octane boost to rule that out. I really don't think it's pinging though. The noise was not present before the top end overhaul, and I have cleaned the power valve and its ports, makeing clearences larger, thats why I suspect the valve. I feel it might be the power valve clanging. It's kinna a metal to metal ting, but not consant enought to be any part of the rotateing mass. any 99' or newer kx owners (KIPS valve system) experience this noise or any problems with power valve noise? again, thanks for all the imput [/QUOTE]