stripped and rebuilt again, all gaskets in the right place, killswitch totally removed (for now) great spark, fuel, needles set to factory. still absoluteley nothing!!!! did notice one thing thats got me worried, when i turned the engine over by had so i could inspect the piston through the inlet and outlet ports, i noticed the the piston top of the piston never cleared the inlet port at b.d.c, i thought id at least have seen a gap appear at the top of the port, between it and the piston. (i hope u get what i mean) so is this normal??