The Namura NA-50015-2K Top End Kit is a high-quality engine rebuild solution for select Polaris Outlaw 50 models from 2008 through 2017. This 39.48 mm oversized piston kit features an 11:1 compression ratio and is designed to restore top-end performance, compression, and reliability when used with the properly prepared cylinder. The kit includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a complete installation.
Namura manufactures this piston using a hypereutectic casting process that increases silicon content for reduced expansion, improved wear resistance, and dependable performance at higher cylinder temperatures. The piston skirt uses a MOS2, or Teflon and molybdenum, coating applied through a rolled-on process. This creates a strong bonded surface that helps reduce friction, improve heat transfer, and minimize the risk of cold seizures during operation.
The machined smooth piston head helps reflect combustion heat and reduce carbon buildup, helping protect the piston crown and support consistent engine operation. An anodized dome further increases heat resistance and durability compared with a non-anodized design. For proper installation, inspect the cylinder and related components, confirm the required oversize bore, and follow the manufacturer's service specifications for ring placement, clearances, and torque.
Fitment: Fits 2008-2017 Polaris Outlaw 50 models. Manufacturer part number: NA-50015-2K. Vendor part number: 186-50152.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 39.48 mm +0.50 mm oversized piston with an 11:1 compression ratio
- MOS2 Teflon and molybdenum coated skirt helps reduce friction, improve heat transfer, and minimize cold-seizure risk
- Hypereutectic casting process provides reduced expansion, increased wear resistance, and improved high-temperature durability
- Machined smooth head helps reflect combustion heat and reduce carbon buildup
- Anodized dome increases heat resistance and piston durability
- Fits 2008-2017 Polaris Outlaw 50 models
- Brand: Namura; manufacturer part number: NA-50015-2K; vendor part number: 186-50152
Fitment:
2007 Polaris Predator 50
2008 Polaris Outlaw 50
2009 Polaris Outlaw 50
2010 Polaris Outlaw 50
2011 Polaris Outlaw 50
2012 Polaris Outlaw 50
2013 Polaris Outlaw 50
2014 Polaris Outlaw 50
2015 Polaris Outlaw 50
2016 Polaris Outlaw 50
2017 Polaris Outlaw 50
2018 Polaris Outlaw 50