Holly Cow Engine wont start have fuel have spark when it started after pedaling the crap out of it it would run at idle only any throttle and it would DIE. Changed plug no luck changed coil no luck pulled kill switch wires no luck changed motor no luck, carb was the only thing left I was sick when I opened up crab and saw main jet tube setting in fuel bowl swimming with the float screwed it back in and guess what LUCK it ran so lets all not forget when your motor wont start but was runnin the other day or just quit runnin all together check that tube.