721 80043700 Parts

This part is a replacement engine cylinder O-ring. This is a genuine OEM part made by MTD and has been sourced directly from the manufacturer. This part can be used to replace a defective or worn engine cylinder O-ring in a variety of line trimmer models. The engine cylinder O-ring forms a seal in between the engine cylinder itself and the engine's crankcase. O-rings are subject to wear and tear, which can cause them to become brittle, worn, or broken, requiring replacement. When working on or near an engine, it's important to ensure that the equipment is powered off and completely cool before beginning any repairs. For more accurate information on how and where to place this engine cylinder O-ring, the appropriate owner's manual and equipment diagrams should be referred to. As an authentic replacement part, this engine cylinder O-ring is suitable for use on line trimmers manufactured by MTD, Craftsman, Troy-Bilt, and other brands. Please note that this is a genuine part made of high-quality, durable materials and is sold individually.

This replacement part is an engine cover. This is a genuine replacement part made by MTD. This part ensures that the engine is safe from large pieces of debris that may fly around during use. It also protects the user from the dangerous parts within the engine that might cause injury.A new engine cover might be needed if the current one is missing or damaged in any way. This could be from damages over time or from a singular occurrence. If the cover is unable to stay attached to the appliance, it might be best to replace this part. Be sure the engine is powered down before replacing the engine cover. This should be an easy repair and should not require more than common household tools. This part is sold individually and is sourced directly from the manufacturer. This is a genuine OEM replacement part.