* Empty fuel tank. Make sure the fuel tank is filled with fresh, unleaded fuel.
* Clogged fuel filter. Replace the fuel filter if it is clogged.
* Stuck float. Clean or replace the float if it is stuck.
* Bad fuel line. Replace the fuel line if it is cracked or damaged.
* Clogged carburetor. Clean the carburetor if it is clogged.
Spark issues
* Bad spark plug. Replace the spark plug if it is fouled or damaged.
* Bad spark plug wire. Replace the spark plug wire if it is cracked or damaged.
* Bad ignition coil. Replace the ignition coil if it is faulty.
* Bad CDI box. Replace the CDI box if it is faulty.
Air intake issues
* Clogged air filter. Clean or replace the air filter if it is clogged.
* Faulty air intake system. Check the air intake system for any cracks or damage.
Electrical issues
* Weak battery. Charge or replace the battery if it is weak.
* Loose battery connections. Tighten the battery connections if they are loose.
* Bad starter solenoid. Replace the starter solenoid if it is faulty.
* Bad starter motor. Replace the starter motor if it is faulty.
Other issues
* Engine compression problems. Check the engine compression to make sure it is within specifications.
* Coolant system problems. Check the coolant level and make sure the coolant system is working properly.
