Namura NA-50011-2K Top End Repair Kit (0.50mm Oversize to 97.07mm)

Keep your machine running in peak condition with the Namura Technologies Top-End Repair Kit. This convenient, time-saving package includes everything you need for a premium top-end rebuild: Piston, Rings, Wrist Pin, Circlips, and a Top-End Gasket Kit.

Engineered to match or exceed OEM specifications, Namura pistons feature advanced manufacturing processes that provide superior performance, high thermal efficiency, and maximum reliability under demanding conditions.

Key Features:

• Hypereutectic Casting Process: High silicon content reduces expansion rates and enhances wear resistance, allowing the piston to withstand extreme cylinder temperatures.

• MOS2 (Teflon/Molybdenum) Coated Skirts: A specialized roll-on application process creates a bond 10 times stronger than traditional spray-on coatings. This dramatically increases heat transfer, reduces friction, and helps eliminate cold seizures.

• Machined Smooth Heads: Reflects combustion heat to reduce carbon buildup and protect the top of the piston, maximizing engine efficiency and durability.

• Anodized Domes: Increase overall heat resistance and strength, creating a dome that is up to 75% stronger than standard, non-anodized alternatives.

Fitment

This specific kit features a 97.07mm Bore (0.50mm Oversize) and fits the following models:

• 2010 Polaris Sportsman 550

• 2011 Polaris Sportsman 550

• 2012 Polaris Sportsman 550

• 2013 Polaris Sportsman 550

Tech Note: Always check your cylinder clearances and ensure proper cross-hatching before final assembly. Follow a proper multi-cycle heat break-in procedure with conventional oil before transitioning to synthetic oil.

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*📦 We only ship to the lower 48 states.