21Cub Parts

The flywheel key is the component on outdoor equipment that keeps the flywheel connected to the crankshaft. Over time, this key may become damaged or broken, particularly if the engine experiences a forceful stop, like hitting a large stationary object. If the flywheel key breaks, the engine will not start. A slightly damaged flywheel key is noticeable through symptoms like misfiring, backfiring, or having no power. If any of these are occurring, the flywheel key should be replaced to prevent complete engine failure.A flywheel puller tool is required for this repair. Make sure the engine is cool before working on the flywheel. Wear safety gear, including gloves and eye protection. Disconnect the spark plug and remove the blower housing. Remove the flywheel mounting nut and set it aside. Take the recoil starter cup off the mower. Use the flywheel puller to remove the flywheel and access the flywheel key. Remove the broken flywheel and replace it with the new flywheel. Reverse the steps to put the mower back together.This flywheel key is made of an aluminum alloy and is sold as an individual part. It is designed for use in lawnmowers, lawn tractors, and other small engines manufactured by Briggs and Stratton, Toro, Lawn-Boy, Simplicity, MTD, and others.

This durable plastic ratchet pawl is used on select engines that feature what is known as a Susa starter. In this configuration, the ratchet pawl will be responsible for engaging the recoil starting system. Then, the starting system will allow the engine to fire. Over time, the pawl can become worn or damaged due to regular use. If this happens, the recoil can slip and cause difficulties with starting the engine. If the engine isn’t starting or you can hear it slipping when you try to fire it up, a replacement ratchet pawl could be needed. Be sure to allow the engine to cool before replacing any parts or doing any work and always wear gloves. This replacement is a genuine OEM part that includes two ratchet pawls for various Briggs & Stratton engines on small lawn equipment. This part offers compatibility with over 150 engines from Briggs & Stratton, Toro, Lawn-Boy, and Vanguard by Briggs & Stratton.

This is a genuine replacement oil fill cap that is found on many lawn and garden engines. The oil fill cap is responsible for securing the oil dipstick and fill tube. This small plastic plug screws into the oil fill tube with plastic threads and secures the oil, keeping it from leaking and providing the appropriate engine pressure. Over time, this small plastic piece can become worn, corroded, damaged, or even lost, which will require a full replacement. Without an oil fill cap, the pressure cannot be maintained in the engine and the oil could spill out of the machine. This genuine OEM oil fill cap is manufactured by Briggs & Stratton to exact standards. It is compatible with engines and equipment from this brand, as well as those from Toro, Snapper, and Vanguard. The oil fill cap is sold as an individual part and does not include the dipstick or any other parts and accessories. It is a good idea to inspect caps and other elements when performing maintenance to ensure proper operation. When replacing the filler cap, no tools are required, but the engine should be cool before doing any kind of work.

This oil seal is a genuine OEM replacement part designed for use on a wide variety of small gas-powered appliance engines. Although small, an oil seal is an important part of the oil cylinder assembly as it prevents oil from leaking into other parts of the engine. If oil begins to leak into the engine, it can corrode other parts or even pose a fire hazard. Therefore, it's important that the oil cylinder is tightly sealed to prevent any damage to the engine. Seals can wear out over time, especially if exposed to heat. Heat will cause the seal to shrink, effectively unsealing the oil cylinder. Before making this repair, be sure to drain the oil cylinder of any oil and be prepared for an involved replacement process. This part is compatible with Toro, Murray, and Briggs & Stratton appliances and is sourced from the original manufacturer. It ship individually of other hardware.

This is an OEM replacement part for the recoil pulley and spring assembly, also called the rewind pulley and spring. The recoil starter, which is operated by a rope, will engage the drive cup on the flywheel, which will start the engine when it is pulled. These are commonly found on lawnmowers and similar outdoor equipment. If the rewind begins to bind when pulling the rope, or if it does not rewind easily, it could indicate that a replacement is needed. In addition, if the plastic on the old pulley is worn and cracked, it is a good idea to replace it before it fails entirely. This OEM assembly comes from the manufacturer and includes the pulley and the spring. The pulley is made from plastic, and the spring is metal. The part can be used for a range of machines and brands. The pulley and spring assembly are compatible with lawnmowers, tillers, and other small engines from brands like Craftsman, Briggs & Stratton, Snapper, Lawn-Boy, Toro, and Cub Cadet.

This is the rocker cover gasket, which seals the cylinder head on small engines so that the engine doesn’t develop leaks. Periodically, a gasket may deteriorate with heavy use. To maintain good engine performance, the rocker cover gasket needs to be replaced with an OEM certified replacement. This type of gasket is most often found on lawn tractors. Replacing the original gasket with the new one is a simple and straightforward process. There are four bolts holding the valve cover in place. Simply remove them and the old gasket, which will likely have to be scraped to get it completely off the cylinder head. Place the new gasket exactly over the metal frame of the cylinder head—it should fit perfectly. Hold it in place with a small amount of RTV, a silicon sealer that is impermeable to oil and gasoline. Replace and tighten the four valve cover bolts. This part is made by Genuine Midwest Engine. This part is used in Briggs & Stratton engines and also used by Toro and Vanguard. This is an OEM part. It's also sold individually.