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What could be wrong if a Yamaha PW80 wont stay running?

1. Check the fuel system. Ensure that the fuel tank is full and the fuel line is not kinked or blocked. You should also check the carburetor to ensure that it is clean and free of debris.

2. Check the air filter. A dirty air filter can restrict airflow and cause the engine to run lean, which can lead to stalling. Clean or replace the air filter according to the manufacturer's recommendations.

3. Check the spark plug. A worn or fouled spark plug can cause the engine to misfire or stall. Remove the spark plug and check it for signs of damage or wear. Replace the spark plug if necessary.

4. Check the ignition coil. A faulty ignition coil can prevent the engine from getting the spark it needs to run. Test the ignition coil according to the manufacturer's recommendations and replace it if necessary.

5. Check the throttle cable. A loose or damaged throttle cable can prevent the engine from getting the air it needs to run. Inspect the throttle cable and make sure that it is properly connected and not damaged.

6. Check the engine oil. Low engine oil can cause the engine to overheat and stall. Check the engine oil level and add more oil if necessary.

7. Check the clutch. A slipping or worn clutch can prevent the engine from transmitting power to the wheels. Inspect the clutch and replace it if necessary.