- Old or dirty fuel: Old fuel can deteriorate and cause problems with the engine. Make sure to use fresh fuel, and if it's been sitting in the tank for a while, drain it and replace it with new fuel.
- Clogged fuel line: The fuel line could be clogged, preventing fuel from getting to the engine. Check the fuel line to make sure it's not kinked or blocked.
- Dirty carburetor: The carburetor could be dirty, preventing fuel from mixing properly with air. Clean the carburetor following the manufacturer's instructions, or have it cleaned by a professional.
- Loose spark plug wire: The spark plug wire could be loose or damaged, preventing the spark plug from getting the power it needs. Make sure the spark plug wire is securely connected to the spark plug and the ignition coil.
- Valve problems: The valves in the engine could be sticking or worn, preventing the engine from running properly. Check the valve clearance and adjust them if necessary, or have them replaced by a professional.
Since the engine appears to have no adjustments for the carburetor, if none of the above solutions resolve the issue, it may be necessary to take the mower to a professional for further diagnosis and repair.
