Restore reliable top-end performance with the Namura NA-50070-CK1 Top End Kit for select Polaris 700 engines. Designed for Nikasil-plated cylinders, this kit includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and complete gasket kit needed for a comprehensive upper-engine rebuild. The precision-engineered components are designed to support proper fitment, durability, and consistent engine operation.
The piston uses a hypereutectic casting process that increases silicon content to help reduce expansion, improve wear resistance, and withstand higher cylinder temperatures. The MOS2 Teflon/molybdenum-coated skirts are applied using a rolled-on process for a stronger bond than conventional spray-on coatings. This coating helps improve heat transfer, reduce friction, and minimize the risk of cold seizures during startup and operation.
Additional piston features include machined smooth heads that reflect combustion heat and help reduce carbon buildup, along with anodized domes engineered for increased heat resistance and durability. The kit is sized for a 79.97 mm piston application and is intended for use with compatible Polaris 700 models equipped with Nikasil cylinders. Verify engine configuration and cylinder type before installation.
Fitment includes the 2006-2009 Polaris Ranger 700 6X6, 2007 Polaris Ranger 700 4X4, 2004-2007 Polaris Sportsman 700 EFI 4X4, and 2005 Polaris Sportsman 700 4X4. Manufactured by Namura and supplied under vendor part number 186-5070C1, this top-end kit provides the core components required for dependable service and engine rebuilding.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 79.97 mm piston size for compatible Polaris 700 Nikasil cylinder applications
- MOS2 Teflon/molybdenum-coated skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined smooth piston head helps reflect combustion heat and reduce carbon buildup
- Anodized piston dome improves heat resistance and durability
- Hypereutectic casting process provides reduced expansion, increased wear resistance, and improved high-temperature capability
- Fits select 2004-2009 Polaris Ranger 700 and Sportsman 700 models
- Brand: Namura
- Manufacturer part number: NA-50070-CK1
- Vendor part number: 186-5070C1
Fitment:
2004 Polaris Sportsman 700 4x4
2004 Polaris Sportsman 700 Efi 4x4
2005 Polaris Sportsman 700 4x4
2005 Polaris Sportsman 700 Efi 4x4
2006 Polaris Ranger 700 6X6
2006 Polaris Sportsman 700 4x4
2006 Polaris Sportsman 700 Efi 4x4
2007 Polaris Ranger 700 4X4
2007 Polaris Ranger 700 6X6
2007 Polaris Sportsman 700 Efi 4x4
2008 Polaris Ranger 700 4X4
2008 Polaris Ranger 700 6X6
2009 Polaris Ranger 700 4X4
2009 Polaris Ranger 700 6X6