Parts for Yard Machines 21AA40M1052 / 2011: Engine Assembly 170-T0a Parts

Engine valve cover cap for outdoor power equipment. Replaces cracked, broken, or missing valve covers on small engines. Direct fit for blowers, tillers, and more.

The breather hose is designed as a valve or vent that only functions one way. It allows air into the fuel tank but ensures that no air or emissions escape the tank. When this hose is not functioning, emissions and air could be leaking from the tank and cause the engine to perform poorly or not perform at all. The hose could become cracked or damaged, or the ends could lose their seal. Either way, a replacement hose will solve the problem and get the equipment back in order. This genuine OEM replacement breather hose is made by MTD and manufactured to exact specifications. It is compatible with several engines on lawn mowers, snowblowers, and chippers from brands like Troy-Bilt, MTD, Yard-Man, Yard Machines, Bolens, Cub Cadet, and Husky. There are more than 150 compatible machines for this breather hose. This high-quality composite rubber hose is sold individually.

Fix oil leaks around your valve cover with this engine gasket. Creates a tight seal between cylinder head and cover. Simple DIY repair for small engines.

Fixes engine misfires and rough running caused by improper valve clearance. This adjusting nut helps restore correct valve timing on lawn mowers and tillers.

Engine running rough or making ticking noises? A worn rocker arm stud can affect valve timing. This replacement stud restores proper valve operation.

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.

M8 hex nut secures components on outdoor power equipment engines. Replace if stripped, corroded, or missing to properly fasten parts during repair.

M6 x 110mm carburetor mounting stud for small engines. Secures carburetor to engine block. Replace if stripped, corroded, or missing to ensure proper installation.

This carburetor insulator is a genuine MTD replacement part for appliances with small engines, such as lawn mowers, lawn tractors, lawn trimmers, snowblowers, chipper shredders, tillers, and leaf blowers. The function of a carburetor insulator in a small engine appliance is to maintain a lower temperature for a running engine and to keep that heat away from the carburetor, the purpose of which is to mix the air and fuel in order to start the engine. A functioning carburetor insulator will prevent the engine from overheating.A broken or non-functioning carburetor insulator will likely not prevent the engine from operating, but it might slow down its power or reduce its fuel economy due to compensation from overheating. An engine with a damaged carburetor insulator might take in more fuel than usual or allow in unmetered air. An unmetered air leak can cause damage to the engine in the short-term so if there appears to be visible damage to the carburetor insulator, it should be replaced as soon as possible.This carburetor insulator is compatible with the following brands: MTD, Cub Cadet, Yard Machines, and Craftsman.

Seals between carburetor and engine block to prevent air and fuel leaks. Replace if engine runs rough, leaks gas, or loses power. Verify fit by model.

Replacement fastener nut for lawn and garden equipment. Threads onto bolts to secure parts together. Replace if stripped, corroded, or missing.

Seals the cylinder head to the engine block, preventing compression and oil leaks. Replace if you notice oil seepage, overheating, or loss of power.

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

Seals cylinder and piston to prevent combustion gas leaks. Replace if engine uses excess oil, loses power, or has poor compression. Verify fit.

Metal connecting rod assembly that links the crankshaft to the piston in small engines. Replace if rod is bent, cracked, or damaged from wear or impact.

Governor arm shaft for small engines on lawn and garden equipment. Connects governor assembly to carburetor. Replace if worn, damaged, or broken.

Engine won't start or runs rough? This camshaft assembly converts rotational motion to reciprocal motion for proper engine operation. Moderate DIY repair.

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

Engine surging or racing? Replace a worn governor gear and shaft assembly. Critical for speed control on small engines. Moderate DIY repair.

Crankcase cover for small engines. Protects internal components from debris and damage. Replace if cracked, broken, or missing to maintain proper engine protection.

This replacement part is an oil seal. This is a genuine replacement part made by MTD. This part is used to ensure that oil and other fuel cannot escape from the tank. The seal prevents it from leaking during use to ensure the engine is able to run properly. A new oil seal might be needed if the current one has been damaged. If the seal is worn down and thinner than before, it can cause leaks and oil waste. If this is the case, the seal should be replaced immediately. Oil leakage can cause other issues within the machine. Refer to the owner's manual for more information on how to replace this part. This is a genuine OEM replacement part. This part is sold individually and is sourced directly from the manufacturer.

Replacement oil drain plug for outdoor power equipment engines. Installs in the oil pan to seal the drain opening. Replace if stripped, cracked, or leaking.

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

Flange bolt fastener for outdoor power equipment. Secures components throughout engine and chassis. Replace if stripped, corroded, or missing.

Replacement flywheel for small engines. This rotating wheel component stores rotational energy. Order a new one if yours is cracked, rusted, or damaged.

Fix engine overheating issues with this cooling fan. Keeps your small engine running at proper temperature. Direct replacement part for reliable operation.

Engine won't start or pull cord slips? This starter cup connects the recoil mechanism to start your engine. Simple bolt-on replacement part.

Fastener nut for outdoor power equipment. Secures components in place during operation. Replace if stripped, corroded, or missing to restore assembly.

Flat washer for engine recoil starter assembly. Replaces worn, missing, or damaged washers during recoil maintenance or repair. Ensures proper spacing.

M6 flange bolt for lawn and garden equipment engines. Replaces broken, stripped, or missing bolts. Secures engine components and covers.

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

Governor spring for small engines on lawn mowers, tillers, blowers, log splitters, and chippers. Replace if stretched, broken, or missing for proper throttle control.

Fix engine surging or racing issues with this throttle spring. Closes the throttle valve to control fuel flow. Quick DIY fix for stuck throttles.

The governor rod is a genuine replacement part found on select models of snowblowers. This rod is responsible for connecting the throttle cable and throttle body, helping to open and close the throttle to change the speed of the engine. This durable metal rod is exposed to repetitive motion and constant vibrations, which can cause damage or wear over time. If this rod does not function, the throttle will be unable to be controlled and that can affect the use of the equipment. Replacing the governor rod with this genuine part will guarantee an exact fit for compatible units. This genuine governor rod is manufactured to specific OEM standards and can be used in compatible machines from Cub Cadet, MTD, Yard Man, Craftsman, Troy-Bilt, Yard Machines, and HUSKEE. The part can be found in snowblowers, with hundreds of possible models that can take this governor's rod. It is made of durable metal and sold as an individual unit. No additional components or hardware are included, and any additional parts will require a separate purchase. Always wear gloves and perform engine repairs only when the machine has had time to cool. Be sure to disengage the engine before doing any work for safety, as well.

Engine runs too fast or won't maintain steady speed? This governor bracket controls engine RPM. Common repair for speed control issues on small engines.

Fuel filter for small engines on snowblowers, tillers, and lawn equipment. Replace annually or if engine runs rough to ensure clean fuel flow. Verify fit with your model number.

Replacement shield cover for blower housing. Installs over the blower assembly to protect internal components. Order a new cover if yours is cracked or missing.

Tiller won't start or rope retracts slowly? This recoil starter spring restores proper pull-cord tension. Moderate DIY repair, typically 30-45 minutes.

Creates a leak-proof seal between the fuel drain plug and tank. Replace if you notice fuel leaking from the drain area. Verify fit with your model number.

This choke control lever automatically regulates the combined amount of air and fuel that come together in a small gasoline powered engine's carburetor to give a cold engine a fuel-rich mixture when the motor is first started. The control lever has several positions that allow it to adjust the fuel/air mixture in lawn equipment such as lawn mowers, snow blowers, tillers, chippers, log splitters, and other small gas engines. Over time with regular use, the control lever may become worn and must be replaced. There are several signs that indicate a choke control lever may be failing. If the gas tank is full of fresh gasoline but the engine refuses to start, if the engine starts and quickly floods, or if the engine runs at top speed but does not idle, the choke control level may be need to be replaced. Should the choke control lever need to be replaced, it is essential to use an OEM genuine manufactured replacement part such as this one. OEM parts are built to the exact specifications of the equipment's original parts. This part is compatible with Huskee, Cub Cadet, Yard Man, MTD, Yard Machines, and Troy-Bilt brand equipment.

It's best to have spare O-ring gaskets on hand to rebuild a carburetor when the need arises. Use this manufacturer-approved replacement part to complete the process. When outdoor power equipment shuts off just after starting or won't start altogether, there may be a problem with the carburetor. It could be a leak that causes compression problems keeping the machine's engine from starting. Gasoline may drip from the float bowl because of an O-ring that won't seal or seat evenly all around, or one that has become brittle over time. This is a genuine OEM part compatible with specific lawnmowers, snowblowers, wood chippers, log splitters, tillers, and other garden maintenance machines from Craftsman, MTD, Cub Cadet, MasterCut, Troy-Bilt, and Yard Machines. It is sold individually.

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

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.

Replace your engine's oil fill plug if it's cracked, stripped, or missing. This plug seals the oil fill opening on small engines for snowblowers and tillers.

Fix fuel leaks or loose carburetor connections with this fuel bowl mounting bolt. Secures the fuel bowl to prevent sediment clogs. Quick 5-minute fix.

Fuel line kit for small engines. Carries fuel through the machine. Replace if cracked, leaking, or ends don't fit securely even when clamped down.

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

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