Namura Standard Bore Top End Repair Kit (90.42mm) - NA-50093K | Polaris Scrambler & Sportsman 1000

Restore your machine’s factory performance without breaking the bank. The Namura Standard Bore Top End Repair Kit (NA-50093K) is a complete, convenient, and time-saving solution designed to get your ride back on the trail with maximum power and longevity.

Rather than spending unnecessary time and money replacing the entire cylinder, this kit provides everything required for a premium top-end rebuild. Each component is engineered to meet or exceed strict OEM performance standards for a seamless, drop-in installation with absolutely no modification or trimming required.

What's Included in the Kit:

• Premium Pistons: Standard Bore (90.42mm) engineered for exact fitment.

• OEM-Quality Piston Rings: Separately packaged for protection during shipping.

• Hardware: Wrist pins and secure circlips.

• Top End Gasket Kit: Made from premium materials resistant to high temperatures, oil, fuel, and coolants.

Performance Engineering Features:

• MOS2 (Teflon/Molybdenum) Coated Skirts: Applied using a unique rolled-on process for a bond 10x stronger than standard spray-on coatings. Dramatically reduces friction, improves heat transfer, and prevents cold seizures.

• Hypereutectic Casting: High-silicon aluminum casting ensures minimal heat expansion, increased wear resistance, and the ability to withstand extreme cylinder temperatures and pressures.

• Machined Smooth Heads: Smooth-finished crowns reflect combustion heat and drastically minimize carbon buildup, protecting the piston while optimizing fuel economy and power.

• Anodized Domes: Increase heat resistance and overall structural durability, making the dome up to 75% stronger than non-anodized alternatives.

Exact Vehicle Fitment Check

This kit features a 90.42mm Standard Bore configuration specifically designed for the Twin-Cylinder Polaris 1000 cc ProStar engine.

• *Free Shipping!*📦 We only ship to the lower 48 states. We do not ship to Alaska, Hawaii, Guam, or Puerto Rico

It is a direct fit for the following models: