Namura Size A (55.94mm) Piston Kit for KTM 150 SX & XC 144 SX Standard Bore 56mm

Namura Size A (55.94mm) Piston Kit for KTM 150 SX & XC 144 SX

This Namura Size A piston kit with a 55.94mm diameter is designed for KTM 150 SX and XC models as well as the 144 SX, providing a high-performance replacement for standard bore 56mm cylinders to restore compression and power.

Overview

The Namura Size A piston kit is a direct replacement for KTM 150 SX, 150 XC, and 144 SX dirt bikes, featuring a 55.94mm piston for use with a standard 56mm bore. This piston kit restores engine compression and performance after a top-end rebuild. Ideal for motocross and off-road enthusiasts, this Namura piston kit offers reliable power and durability.

Built For Performance

• Precision-machined from high-strength aluminum alloy
• Includes piston, rings, wrist pin, and circlips for a complete top-end kit
• Designed to match KTM's 56mm standard bore specifications
• Provides consistent compression and reduced friction for improved throttle response
• Tested for durability under high-RPM racing conditions

Fits These Machines

• for KTM 150 SX
• for KTM 150 XC
• for KTM 144 SX

On-The-Job Use

• Top-end engine rebuilds for motocross bikes
• Trail riding and competitive off-road racing
• Replacing worn pistons to restore engine performance
• Seasonal maintenance for KTM two-stroke engines

Specs At A Glance

Good To Know

Q: Does this piston kit include everything needed for installation? A: Yes, the kit includes the piston, rings, wrist pin, and circlips, but you may need to reuse or replace the cylinder base gasket and head gasket separately.

Q: Can this piston be used with a stock KTM cylinder? A: This Namura Size A piston is designed for use with a standard 56mm bore cylinder; if the cylinder has been bored oversize, a different size piston may be required.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.