Engine does not start or hard to start

A. If the ignition stop switch wire connected to the ground or not;

B. If the spark plug and ignition can normally and consecutively ignite or not; if the spark plug gap between 0.6-0.8 mm or not; if the spark plug wetted by fuel;

C. If the oil system be blocked or not;

D. Disassemble the air filter cover and element, press the primer, see if there’s fuel spray out or not. Fuel not spraying means the primer not working;

E. Test again after changing a new carburetor.