Hi all, I'm back with more troubles on my Genesis 29er. Got the simple LEB PK80 motor on there. For about 3 days now, my engine has been sounding like a jackhammer - like its clanking really loud on mid-high rpms. Also my top end has fallen a few MPH (About 5) and throttle response is much crappier. I took off the cylinder head and found a lot of carbon buildup. Piston had carbon build up all over the edge of the top. I took a dremel and a wire wheel and wicked away as much carbon as i could until it looked clean. I replaced the cylinder with an old one laying around as well as the cylinder head. I'm running 50:1 ratio with 93 octane gas. Got a torquer 2 exhaust and a NT speed carb on there and a thinner head gasket. everything else is stock. Even with the cylinder and head replaced it still sounds the same. Any ideas? I also cleaned out the entire clutch area (took out the clutch flywheel and cleaned the rubber/carbon deposits with cleaners, and replaced) idk whats going on but I really dont want to order a new motor unless i have to.. BTW I've had this engine for about 3 months and I ride it every single day to work and back but not as much on the wekeends... It gets plenty of use though, believe me.