Check the spark plug. Ensure the spark plug is clean, properly gapped, and in good condition. Replace the spark plug if it is worn or damaged.
Check the air filter. Clean or replace the air filter if it is dirty.
Check the carburetor. Clean the carburetor and ensure that all of the jets are clear. Replace the carburetor if it is damaged.
Adjust the idle speed. Adjust the idle speed so that the engine idles smoothly without surging.
Check for fuel starvation:
- This can happen if the fuel line is kinked, or if there is a blockage in the fuel filter or carburetor.
- If the fuel filter is clogged, it can be cleaned or replaced.
- If the fuel line is kinked, it can be straightened.
Check the fuel cap:
- Ensure that it is properly vented. If the fuel cap doesn’t vent properly, it can cause fuel starvation.
If you have tried all of these steps and the engine is still surging, it is possible that the problem is with the engine itself. In this case, you should take the engine to a qualified small engine repair shop for further diagnosis and repair.
