ok...is your gas and oil mixed properly...is your trottle working...no sticking....check the gap on the spark plug...020 to.024....now wiring...from the engine...black(ground) to black from the CDI...blue to blue....white leave alone.....kill switch...power wire to your power wires...your ground i prefer to the frame...your choice...gas and oil 20 to 1 if you use regular 2 stroke oil....i use amisol...sabre and i'm at 80 to1 forever...ha....i'm the guinne pig...its great. remember when you mix your oil and gas, do it in a 1 gal. can...oil first than put gas in...shack and go. well i hope this helps...oh...is the clutch engaging properly....check all that and if that dont work...get a hammer...ha...what kind of plug are you using? NGK...the best i think...some of the kit ones are messed up...Dennis