The NAMURA NX-70000K Top End Kit is a complete replacement solution for select KTM 50 SX two-stroke models equipped with a Nikasil-plated cylinder and a 39.46 mm standard bore. Designed to support reliable engine rebuilding and consistent performance, this kit includes the essential components needed to refresh the top end, including a piston, piston rings, wrist pin, circlips, top-end bearing, and gasket kit.
Precision-engineered construction helps the piston withstand the heat, friction, and operating demands of small-displacement performance engines. The piston features a MOS2 Teflon/molybdenum-coated skirt applied through a rolled-on process for strong coating adhesion, improved heat transfer, reduced friction, and enhanced protection against cold seizures. A machined smooth head helps reflect combustion heat and reduce carbon buildup, while the anodized dome improves heat resistance and durability. NAMURA's hypereutectic casting process adds silicon for controlled expansion, increased wear resistance, and improved performance at elevated cylinder temperatures.
Fitment includes 2007 KTM 50 SX, 2008 KTM 50 SX, 2008 KTM 50 SX Mini, 2007 and 2008 KTM 50 SX Junior, and 2002 through 2006 KTM 50 SX Pro Jr LC models. Verify the motorcycle model, cylinder type, and standard-bore requirement before installation. This NAMURA top end kit is intended for Nikasil cylinder applications and provides a convenient matched set for maintenance, repair, or engine rebuilding.
Features:
- Complete top-end kit includes piston, rings, wrist pin, circlips, top-end bearing, and gasket kit
- MOS2 Teflon/molybdenum-coated piston skirt helps reduce friction, improve heat transfer, and protect against cold seizures
- Machined smooth piston head helps reflect combustion heat and reduce carbon buildup
- Anodized piston dome improves heat resistance and durability
- Hypereutectic casting process provides controlled expansion, increased wear resistance, and improved resistance to high cylinder temperatures
- 39.46 mm standard-bore piston designed for Nikasil-plated cylinders
- Fits 2007 KTM 50 SX, 2008 KTM 50 SX, 2008 KTM 50 SX Mini, 2007-2008 KTM 50 SX Junior, and 2002-2006 KTM 50 SX Pro Jr LC
Fitment:
2001 KTM 50 SX Pro Sr LC
2002 KTM 50 SX Pro Jr LC
2002 KTM 50 SX Pro Sr LC
2003 KTM 50 SX Pro Jr LC
2003 KTM 50 SX Pro Sr LC
2004 KTM 50 SX Pro Jr LC
2004 KTM 50 SX Pro Sr LC
2005 KTM 50 SX Pro Jr LC
2005 KTM 50 SX Pro Sr LC
2006 KTM 50 SX Pro Jr LC
2006 KTM 50 SX Pro Sr LC
2007 KTM 50 SX
2007 KTM 50 SX Junior
2007 KTM 50 SX Pro Jr LC
2008 KTM 50 SX
2008 KTM 50 SX Junior
2008 KTM 50 SX Mini