Took the carby off as well as muffler, rings are ok, piston looks good. I only feel reistance once for every rotation ie the second bit of resistance is fairly weak. It's like i've forgotten to tighten something but i dont know what. I guess i've got to take the engine apart again, does this mean i'll have to replace the gaskets as well, i replaced them a couple of weeks ago? The connecting rod seems a little loose, dont know if it should be connected more tightly to the crankshaft?