1. Clogged fuel line or fuel filter: Ensure the fuel line is free of any obstructions and that the fuel filter is clean.
2. Bad spark plug: Replace the spark plug and check the spark plug wire for any damage.
3. Idle mixture too lean: Adjust the air-fuel mixture screw to allow more fuel into the engine.
4. Fuel pump issue: Check the fuel pump for proper function.
5. Bad CDI unit: Replace the CDI unit.
6. Dirty carburetor: Remove and clean the carburetor, paying close attention to the jets and passages.
7. Stuck float: Ensure the float in the carburetor moves freely and is not sticking.
8. Check the compression: Low compression can cause the engine to run poorly or not at all.
9. Vacuum line leak: Check for any vacuum line leaks that may be causing a lean fuel mixture.
