Namura Standard Bore Top End Kit Size A for KTM 125 SX & 125 EXC 2002-2006 54mm

Standard Bore Top End Kit Size A for KTM 125 SX & 125 EXC

This top end kit for KTM 125 SX and 125 EXC (2002-2006) includes a 54mm piston, rings, pin, and gaskets, providing a complete cylinder rebuild solution.

Overview

This standard bore top end kit size A for KTM 125 SX and 125 EXC two-stroke models delivers all necessary components for a fresh piston and ring installation. Designed for engines requiring a 54mm bore, it restores compression and performance.

Built For Performance

• Includes a 54mm piston made from high-strength aluminum alloy
• Precision-machined piston rings for optimal sealing
• Comes with wrist pin and circlips for secure installation
• Includes head gasket and base gasket for a complete rebuild
• Manufactured to OEM specifications for exact fit
• Runs cooler and reduces friction for sustained power delivery

Fits These Machines

• for KTM 125 SX (2002-2006)
• for KTM 125 EXC (2002-2006)

On-The-Job Use

• Used for motocross racing on 125 SX models
• Suitable for enduro and trail riding on 125 EXC models
• Ideal for top end rebuilds after hours of competition use
• Commonly used by riders performing routine engine maintenance
• Applies to both closed-course and off-road riding

Specs At A Glance

Good To Know

Q: Is this a complete top end kit? A: Yes, the kit includes the piston, rings, wrist pin, circlips, and both head and base gaskets for a full top end rebuild.

Q: Can I use this on a KTM 125 SX with a different year? A: This kit is specifically designed for 2002-2006 models; earlier or later years may have different bore sizes or port configurations, so check compatibility.

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