Right this engine just will not RUN with decent power. The starter just broke so I just replaced it after 5 days of unuse and with the same settings which it started on, ITS DEAD. It fired up but the engine wont rev and if it does it boggs down and stalls. The engine has never ran properly really and I know they are fine tuned but FOR GOD SAKE. I looked and there is a tiny amount of scoring down the barrel but it still runs (as in starts).

I really cannot be bothered with this engine anymore as it is just wearing me down while it seems all you guys are having fun. What do you all think I should do?