Parts for Mtd 478-SU / 2009: Engine Assembly 478-Su Parts

M6 x 1 flange bolt for outdoor power equipment. Secures engine covers, handles, and components. Replace if stripped, rusted, or missing threads.

Zinc-plated M6 x 12mm hex bolt for securing components on lawn tractors and outdoor power equipment. Replace when stripped, rusted, or missing.

Snowblower won't start or pulls hard? This recoil starter assembly restores reliable pull-start function. Common repair for worn or broken recoil.

Washer fastener for outdoor power equipment engines. Secures components and ensures proper fit. Replace if missing, damaged, or worn during maintenance.

Snowblower won't start or shuts off unexpectedly? This ignition switch controls engine power. Direct replacement part restores reliable starting.

Replace your snow thrower's choke knob if the original is cracked, broken, or missing. Installs on the engine control panel for manual choke operation.

Flange bolt for lawn equipment and outdoor power tools. Secures engine components and assemblies. Replace if bolt is stripped, missing, or damaged.

Fix engine misfires or no-start issues with this spark plug. Ignites the air-fuel mixture in your mower's cylinder. Quick DIY replacement in 15 minutes.

Muffler gasket seals exhaust connection on snow throwers. Replace if exhaust leaks or noise increases. Verify fit with your model number before ordering.

Rocker stud bolt that secures the rocker arm assembly in small engines. Replace if threads are stripped, bolt is bent, or stud is broken or missing.

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

Loose or vibrating parts? This pivot locking nut secures critical pivot points on lawn equipment. Simple installation takes 10-15 minutes.

The carburetor insulator gasket, or intake gasket, sits between the carburetor and the combustion chamber of a gasoline powered engine. This gasket provides a perfect seal that serves two purposes: to keep the fuel/air mix in the carburetor from experiencing too much heat before entering the combustion chamber and to prevent air or fuel from leaking. This particular gasket is used in a variety of small gasoline powered tools, including one- and two-stage snow blowers, log splitters, and other engine applications. This gasket continually experiences air, fuel, and heat extremes during use, and over time, the gasket may become warped or so worn that it becomes ineffective, allowing leaks to develop. When an insulation gasket begins to leak, there are some typical signs, including a very hot engine, stalling, sputtering, lack of power, and unusually high gas consumption. The carburetor must be removed in order to replace this gasket, which sits between the carburetor and intake manifold. When replacing this part, it is best to use a gasket such as this one, which is a genuine OEM replacement part, manufactured to be identical to the original part. This gasket is compatible with machines offered by Craftsman, Cub Cadet, Yard Machines, MTD, and Troy-Built.

Insulator gasket that seals between the carburetor and engine block on snow throwers. Replace if cracked, torn, or missing to prevent air leaks.

Carburetor gasket seals the insulator and carburetor connection for proper engine compression. Replace if your engine runs rough, misfires, or leaks fuel.

M4 x 55mm mounting screw for snow thrower engines and small lawn & garden equipment. Replaces broken, stripped, or missing screws in engine assembly.

M6 x 21mm governor bolt for outdoor power equipment engines. Replace if bolt is stripped, missing, or damaged during governor maintenance or repair.

Governor spring for snow throwers and small engines. Installs on the governor linkage to control engine speed. Replace if stretched, broken, or missing.

Throttle return spring installs on snow thrower engine to control throttle opening and closing. Replace if stretched, broken, or missing from linkage.

Secures engine and frame components on lawn mowers and snow throwers. Replace if stripped, rusted, or missing to keep parts firmly attached.

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

Control panel not responding or buttons malfunctioning? This snow thrower control panel restores operation. Moderate DIY repair, about 30-45 minutes.

Engine won't start or runs rough in cold weather? A faulty choke assembly prevents proper fuel mixture during startup. Direct replacement part for snow throwers.

Replacement fuel tank for snow throwers and gas snowblowers. Holds gasoline for engine operation. Replace if cracked, leaking, or damaged.

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.

Replace this snowblower bearing bushing when you notice excessive wobble or noise from the auger. Ensures smooth rotation and prevents damage. Confirm fit with your model number before ordering.

Throttle control knob for snow throwers and gas snowblowers. Replaces broken, cracked, or missing throttle knobs for smooth engine speed adjustment.

Secures engine components and mounts on outdoor power equipment. Replace if bolt is stripped, damaged, or missing to ensure proper assembly and fit.

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

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

Snow thrower won't start when you pull the cord? A broken or loose starter handle prevents engine starting. Easy 10-minute fix for most models.

Seals the fuel bowl to prevent leaks and keep dirt out of your fuel system. Replace when cracked or leaking. Confirm fit with your model number.

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.

Engine won't start or has low compression? This short block assembly restores power to snow throwers and lawn equipment. Intermediate repair, 2-4 hours.

Replace a leaking or damaged oil drain assembly on your snowblower engine. Includes valve for easier oil changes. Basic hand tools required.

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