Product overview This 52mm cylinder piston ring pin gasket bearing kit is a complete replacement set designed for and maintenance of compatible chainsaw engines. It replaces part number 1128 020 1221 and fits MS460 and MS 046 chainsaw models with a 52mm cylinder diameter. The kit includes a piston assembly, rings, pin, gaskets, and bearing to support a full cylinderlevel service. Key benefits Complete rebuild in one kit: includes piston, rings, pin, gaskets, and bearing so you have the parts needed to restore cylinder function without sourcing multiple components. Restores compression and engine performance: replacing worn piston components and seals helps recover lost power, reduce smoke, and improve starting. Precise fit for specified models: engineered to the 52mm cylinder specification and identified as replacement part 1128 020 1221 for MS460 and MS 046 compatibility. Reduces downtime: a single kit simplifies maintenance and speeds up field or repairs. Easy inspection and replacement: parts are arranged for straightforward installation when performing routine service or a cylinder rebuild. What is included 1 set x cylinder piston kit plus gaskets and bearing Function and attributes Function: piston and rings compress the fuel air mixture and transfer piston motion to the crankshaft; gaskets seal the combustion chamber; bearing supports the piston pin. Compatibility: compatible with MS460 and MS 046 chainsaw models specified for a 52mm cylinder diameter; replaces part number 1128 020 1221. Size: cylinder diameter 52mm. Construction: supplied as a matched set for reliable assembly and fit. Practical applications and use scenarios Routine maintenance: worn piston rings and gaskets during scheduled engine service to maintain power and efficiency. Field after low compression: use the kit to fix engines that exhibit poor starting, heavy smoking, or reduced cutting performance caused by worn piston components. Postdamage rebuild: perform a cylinderlevel rebuild after piston scoring or other internal engine damage to restore reliable operation. Installation notes Verify compatibility with your machine before by confirming model MS460 or MS 046 and a 52mm cylinder diameter. Recommended for use by technicians or experienced users familiar with small engine disassembly and reassembly. Install gaskets and torque components to manufacturer specifications where available. This kit provides the essential components for a proper cylinderlevel service on compatible chainsaw models, helping to restore engine compression and functional performance.