Parts for Troy-Bilt TB425CS: Engine Parts

Engine won't start or runs rough? This spark plug provides reliable ignition for small engines in trimmers, blowers, and tillers. Easy DIY replacement.

Flywheel assembly for tillers and outdoor power equipment. Replaces cracked, damaged, or worn flywheels that affect engine timing and cooling fan operation.

Reel spool assembly for gas line trimmers. Holds and feeds trimmer line during operation. Replace if spool is cracked, worn, or missing components.

Replacement reel and line assembly for gas line trimmers. Installs on the trimmer head. Replace when reel is cracked, line is worn out, or assembly is missing.

Replacement shoulder strap for line trimmers and leaf blowers. Attaches to equipment for comfortable, hands-free operation. Replace if worn, frayed, or broken.

Carburetor insulator gasket for gas line trimmers. Sits between carburetor and engine block. Replace if cracked, warped, or missing to prevent air leaks.

This is a replacement carburetor and primer that is for use with several types of gas-powered lawn and garden equipment. It mixes air and fuel before sending it into the engine. This ensures that there is a proper mix, so the machine can start up correctly. If there is an issue with the carburetor, it will often mean that the machine feels as if it is not getting enough power. In some cases, the machine might not start at all.Over time, the carburetor might need to be replaced. The primer could start to wear out and crack, as could the throttle line. The metal of the carburetor might start to wear down eventually, as well. If there are issues, they will need to be replaced. Replacing the carburetor is easy and will only take a screwdriver. Owners should be sure to repair the machine in a well-ventilated area.The replacement carburetor and primer works with a range of tillers and trimmers from MTD, Troy-Bilt, and Cub Cadet. It comes with a carburetor, rubber primer bulb, and throttle cable. This is an OEM part that has been sourced from the manufacturer.

This carburetor O-ring creates an airtight seal between carburetor components to prevent fuel and air leaks in small engines. It maintains proper fuel mixture and prevents contamination that could affect engine performance. Replace it when you notice fuel leaks around the carburetor, poor engine performance, or difficulty starting your equipment.

Breather housing assembly for line trimmers and tillers. Replaces cracked, broken, or damaged housings. Installs on engine to maintain proper ventilation.

Fix reduced engine performance and rough running on your leaf blower or trimmer. This replacement air filter prevents dust from entering the engine.

Replacement fuel cap for lawn tractors, trimmers, blowers, and tillers. Prevents fuel leaks and evaporation. Replace if cracked, broken, or missing.

Replacement fuel return line carries excess fuel from carburetor back to tank. Replace if you smell fuel or experience engine misfires. Confirm fit by model.

The fuel line assembly with filter is the complete line that carries fuel from the tank to the engine carburetor, with an inline filter attached to catch debris and contaminants before they reach engine components. Keeping the fuel clean protects the carburetor and ensures consistent fuel delivery. Replace this assembly if the engine is hard to start, runs roughly, stalls frequently, if you notice fuel leaks, or if the filter is visibly clogged or deteriorated.

Fastening nut for tillers, trimmers, blowers, and edgers. Secures components by working with bolts. Replace if stripped, corroded, or missing.

If your starter rope won't retract or recoil properly, the recoil starter pulley may be damaged. This pulley works with the recoil spring to retract the rope.

Replace a broken recoil spring when your gas trimmer, edger, or blower won't pull-start or the cord won't retract. Simple DIY repair in under 30 minutes.

This replacement part is a rope guide, and it is intended for use in different types of lawn equipment. This is a genuine replacement part made by MTD. This rope guide allows the user to pull start the engine. The rope is connected to the transmission inside the engine that allows it to be turned off and on when desired. A new rope guide might be needed if the current one is damaged or missing. If the user is unable to start the lawn mower, then the rope guide might not be connected and should be replaced. Be sure that the engine is completely powered off while attempting this repair as this part is close to the engine inside the appliance. This part is sold individually and is a genuine OEM part sourced directly from the manufacturer to ensure proper fit in all appliances. Reference the owner's manual for more specific guidance.

Replace a frayed or broken starter rope that prevents your engine from starting. This pull rope wraps around the starter pulley for manual ignition.

Starter housing assembly for gas line trimmers. Replaces cracked, broken, or damaged red starter housings. Protects internal recoil mechanism.

Clutch won't engage or burning smell from your tiller? This clutch assembly connects engine power to the tines. Moderate DIY repair for tillers.

This is the clutch drum that houses the clutch that engages the power tools on more than 50 gasoline-powered lawn and landscape devices. The clutch sits inside this housing, which enables it to rotate. When the RPMs of the engine reach a certain point, the clutch expands and causes the drive shaft of the tool to engage. Among the different kinds of equipment that use this clutch housing are cultivators, edgers, and grass trimmers. The clutch, and therefore the clutch drum, receive a great deal of wear for several reasons: the vibration of the engine, the rapid up and down change of engine revolutions, and resistance met by the tools that are transferred back to the clutch and housing. Signs that the clutch is failing include a slow response to increased engine RPMs and an inability for the power tool to engage the drive shaft. In these cases, the clutch and housing should be replaced in order for the equipment to operate properly again. When choosing a clutch housing, it is important to select one that, like this one, is a genuine OEM certified part. This housing is compatible with Craftsman, Troy-Bilt, MTD, Bolens, Yard-Man, and Ryobi equipment.

Secures the lower handle clip on line trimmers and lawn equipment. Replace if broken, stripped, or missing to properly mount the handle assembly.

Few parts fulfill as many roles on lawn mowers and other landscaping power tools than the cover screw. This screw serves to attach metal housing parts, assemblies, and shrouds to one another on equipment such as power vacuums, snow blowers, edgers, tillers, hedge trimmers, lawn tractors, leaf blowers, grass trimmers and cultivators. As these are extremely durable metal screws, they seldom fail under ordinary use. It should be noted, however, that they are most often used at connection and pressure points. Stresses at these junctions sometime loosen screws, causing them to be lost or occasionally resulting in stripped threads. It's also occasionally the case that these screws are lost during repair or routine maintenance of yard equipment because of their small size. Users should make sure to consult their owner's manuals for replacement steps and any special instructions. Because of their small size and the ease of losing them during repair work or maintenance, it's recommended to keep a supply of appropriately sized screws on hand. Most importantly, when replacing a part make sure to use a genuine OEM replacement part. They are manufactured according to the specs of the original parts and are perfect replicas.

This breather hose is a component that makes up part of the ventilation system for the crankcase with lawn and garden tools. It has a single way valve that prevents excess exhaust gases from transferring to the engine. A reed is included to help lubricate the piston as the hose moves oil to the crankcase. The tube is made with special fibers that filter and cool the air to prevent the engine from overheating.If oil is leaking from lawn and garden equipment, this can indicate that the breather hose needs to be cleaned or has been damaged. If it is dirty, it will often create blue smoke that leaves the exhaust pipe. If the smoke is dark, this is a sign that the breather hose may be damaged and need replacement. Inspect the hose to see if it looks dirty or damaged so a replacement can be made if needed.This breather hose is an OEM replacement component directly sourced from the manufacturer. It is a single individual hose. The breather tube can be used with lawnmowers, tillers, string trimmers, edgers, and leaf blowers by Yard-Man, Craftsman, Cub Cadet, Bolens, Ryobi, Troy-Bilt, Murray, MTD, and Yard Machines.

This replacement part is an oil plug ring. It is a genuine replacement part made by MTD. This specific part is typically found in machines and appliances that have an oil tank. This ring is used to make sure that the oil from the machine does not escape during use.A new oil plug ring might be needed if the current one is allowing oil to escape from the tank. If there are oil drips near the engine it is possible that the ring is damaged or broken. This part is small but important to the overall use of many machines. Be sure to reference the specific user manual for more information on how to replace this part. This part is sold individually. It is a genuine OEM replacement part and is sourced directly from the manufacturer to ensure a proper fit and long-lasting use.

Compression spring for line trimmers. Installs in the trimmer head assembly to maintain tension. Replace if worn, broken, or missing for proper operation.