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Compatibility
This part will fit the following 221 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
RyobiRyobi 410r (21DK410G034) - Ryobi TillerEngine
CraftsmanCraftsman 316.791890 (41AD770C799) - Craftsman String Trimmer (Sears)Engine
CraftsmanCraftsman 316.29256 (21AS122R799) - Craftsman Tiller (2004) (Sears)Engine
CraftsmanCraftsman 316.791920 (41AD2TBC799) - Craftsman String Trimmer (Sears)Engine
Yard MachinesYard Machines Y 700 (41ADY70G000) - Yard Machines String TrimmerEngine
Description
The purpose of the Piston Ring is to wrap around a piston in order to seal the combustion chamber to ensure minimal loss of gases to the crankcase, improve heat transfer, maintain oil between the piston and cylinder wall, and regulate engine oil consumption. Damaged piston rings can create excess exhaust smoke and oil consumption, as well as impact the performance of the engine. Replacing a piston ring requires extensive disassembly of your equipment and engine.