Hard starting and no-start problems
Fuel left in a mower during storage can lose volatility and leave deposits in small carburetor passages. A dirty air filter, worn spark plug, damaged primer, or ignition problem can also make the mower difficult to start.
- Fresh fuel and proper fuel flow
- Spark plug and ignition
- Air filter, primer, and choke operation
Surging or running only with the choke on
An engine that hunts up and down or needs partial choke often has a fuel-delivery or air-leak problem. Continuing to adjust controls without finding the restriction can hide the actual cause.
- Carburetor passages
- Fuel cap vent and fuel supply
- Intake gaskets and linkage
Vibration, blades, and self-propel issues
Stop using a mower that develops strong vibration after an impact. The blade, crankshaft area, mounting hardware, wheels, belt, and self-propel cable may need inspection depending on the symptom.
- Blade damage and balance
- Loose or damaged mounting parts
- Drive belt, wheels, and control cable