1. Carburetor Issues:
- Check the carburetor for any blockages or dirt that may be preventing proper fuel flow. Clean or rebuild the carburetor if necessary.
2. Float Adjustment:
- The float in the carburetor controls the fuel level. If the float is not adjusted correctly, it can cause the engine to flood, resulting in a wet plug. Adjust the float according to the manufacturer's specifications.
3. Choke Issues:
- Ensure the choke is functioning correctly. If the choke is not closing properly, it may cause the engine to flood, resulting in a wet plug. Make sure the choke is fully open when starting the mower.
4. Ignition Timing:
- Incorrect ignition timing can affect the engine's starting and running. Make sure the ignition timing is set according to the manufacturer's specifications.
5. Spark Plug Issues:
- Although you mentioned there is a spark, checking the spark plug again can be beneficial. Ensure the spark plug is clean, correctly gapped, and in good condition. A weak or fouled spark plug may cause the engine to start with starting fluid but not run on its own.
6. Check Valves:
- Check the intake and exhaust valves for proper seating. If the valves are not sealing correctly, it can affect the engine's compression and starting ability.
7. Cylinder Head Gasket:
- If the cylinder head gasket is damaged or not sealing properly, it can cause compression leaks, leading to starting problems. Check the cylinder head gasket for any damage or leaks.
8. Timing Belt or Chain:
- If your mower has a timing belt or chain, ensure it is in good condition and properly aligned. Incorrect timing can cause starting issues.
If the above suggestions do not resolve the issue, it may be a good idea to have the mower inspected and diagnosed by a professional mechanic or small engine repair shop.
