This morning I decided to pull out my reed cage for a quick inspection. I pulled out the spark plug so I could turn the engine over and quickly peek at the piston too. I put the bike into fist gear and slowly spun the rear tire. What I noticed was a loud, hollow knocking noise at TDC and BDC. I know the engine noise is normal for a KDX. My friends bikes are no louder or quieter than mine. Has anybody else noticed this with their bike? It almost seems like a problem with clearance or a wrist pin. My local dealer say's that replacing the piston with one other than OEM, makes it considerably louder. Has anyone had any luck reducing this noise? Has anyone installed a bige bore kit and have the same noise?
Actually, the bike runs great! It's never had a top end done, but then again it's only got about 200 miles on it. I'm just concerned about the rapping noise that it, and other KDX's, make. It's just not right.