You might be on to something there i have been running the same piston and bore for 2 years now but i don't ride it much because of the jetting. i was scarred of wearing down the cylinder. I pulled off the top end and i found the billet reed spacer halfway on there hanging by one screw. damn that could have been a disaster. but i think now i should either check the compression or rebuild as you said it might not be burning the fuel efficiently with low compression. I inspected the cylinder and there ain't a hair scratch on it. I still see the cross hatch hone left from the last time i did it when i replaced the piston rings. I just hope that 200 $ will solve the issue that i'm having with the carb not syncing in right.