Parts for Yard Machines 21AA40M1052 / 2009: Engine Assembly Parts

Ignition coil for small engines on lawn and garden equipment. Replace if cracked, damaged, or worn. Includes spark plug boot and wire assembly.

Air cleaner housing for tillers and garden engines. Covers and protects the air filter assembly. Replace if cracked, broken, or missing to maintain engine.

Cleans incoming air for optimal engine performance. Replace when clogged or debris-filled to maintain proper airflow. Verify fit with your model number.

Engine won't start when you pull the cord? This tiller recoil starter assembly includes all components needed to restore pull-start functionality.

This replacement part is a stud assembly. This is a genuine replacement part made by MTD. This stud assembly is responsible for keeping the muffler in place and secure so that the lawn mower may operate smoothly and according to the user's preferences. A new stud assembly might be needed if the current one is misplaced or damaged. It is not unusual for the studs to become stripped over time and need to be replaced. If the muffler is no longer able to stay in place, it can be due to the studs and should be looked into. Be sure the engine is completely turned off before attempting to replace this part. This stud assembly is sold individually and is sourced directly from the manufacturer. This part is a genuine OEM replacement part to ensure proper fit and long-lasting use.

This is a small engine spark plug positioned in the engine cylinder head. It supplies the spark that will ignite the air-fuel mixture to enable an engine to produce power. This particular spark plug is designed with superior corrosion resistance and dependable performance. Small but mighty, this component allows for increased conductivity and heat control. If the spark plug is damaged or in poor condition, many problems may arise in equipment, including sudden stop while running, overheating, and excessive gas consumption. Replace the spark plug by disconnecting the spark plug wire first, then use a socket driver or wrench to remove the spark plug. Install the new spark plug by turning it by hand initially to avoid cross-threading. If it doesn't twist anymore, use a deep socket wrench or socket driver to tighten the plug until snug. The spark plug can also be used to tune up outdoor power equipment or improve a small engine. This part is recommended to be replaced once per season. This part works with lawn mowers, snowblowers, tillers, leaf blowers, log splitters, wood chippers, and others with small engines. It is compatible with brands such as Craftsman, Cub Cadet, Troy-Bilt, Murray, Yard Machines, MTD, Huskee, Bolens, Yard-Man, and MasterCut. This is a genuine OEM part directly from the manufacturer and is sold individually.

Fuel tank nipple connects fuel lines to the tank on small engines. Replace if cracked, leaking, or worn to restore proper fuel line connections.

Engine won't start after sudden stop? A sheared flywheel key breaks the connection between crankshaft and flywheel. Simple DIY repair.

Push rod kit for small engines. Installs in the valve train assembly. Replace if rods are bent, damaged, or worn from normal engine operation.