The Namura NX-70020K Top End Kit is a complete standard-bore replacement kit designed for select KTM 50 SX and Husqvarna TC 50 motorcycles with Nikasil-plated cylinders. The kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a comprehensive top-end service. It is engineered to support dependable fitment, consistent performance, and long-term durability in demanding off-road applications.
Namura uses a hypereutectic casting process that increases silicon content to help reduce expansion, improve wear resistance, and withstand elevated cylinder temperatures. The piston features MOS2, or Teflon/molybdenum, coated skirts applied through a rolled-on process for a strong, durable bond. This coating helps improve heat transfer, reduce friction, and minimize the risk of cold seizures during operation. Machined smooth heads help reflect combustion heat and reduce carbon buildup, while anodized domes improve heat resistance and durability.
This Namura top-end kit fits 2009 through 2017 KTM 50 SX models, along with the 2017 Husqvarna TC 50. Verify the motorcycle year, model, cylinder configuration, and required standard-bore application before installation. Manufacturer part number NX-70020K and vendor part number 185-7020 identify this replacement kit.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 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 performance
- Standard-bore replacement for Nikasil-plated cylinders
- Fits 2009–2017 KTM 50 SX and 2017 Husqvarna TC 50 models
- Brand: Namura
- Manufacturer part number: NX-70020K
- Vendor part number: 185-7020
Fitment:
2009 KTM 50 SX
2010 KTM 50 SX
2011 KTM 50 SX
2012 KTM 50 SX
2013 KTM 50 SX
2014 KTM 50 SX
2015 KTM 50 SX
2016 KTM 50 SX
2017 Husqvarna TC 50
2017 KTM 50 SX
2018 Husqvarna TC 50
2018 KTM 50 SX
2019 Husqvarna TC 50
2019 KTM 50 SX
2020 Husqvarna TC 50
2020 KTM 50 SX
2021 Gas-Gas MC 50
2021 Husqvarna TC 50
2021 KTM 50 SX