Hi fellow 2 smokers, I recently bought a 2001 kx144 big bore. The bike runs fine, I just felt it could have more compression, and as I was unsure how long the piston had been in I decided on a top end rebuild. It has a Wiseco piston that is in great condition with no score marks so I just changed the piston ring, small end bearing, gudgeon pin and circlips which all came from a Wiseco dealer and every part that I replaced was identical to the previous.
when I completed the rebuild I kicked the bike over and with the engine idling I can now hear what I can only describe as a metallic pinging coming from the engine that wasn't there before the rebuild. I'm thinking maybe the piston ring could be hitting the exhaust valve, this is all I can come up with !
any advice please ? I'm stuck !