Namura Standard Bore Size B Top End Kit for KTM 250 SX MXC EXC 66.4mm SEE YEARS

Standard Bore Size B Top End Kit for KTM

This top end kit provides a complete cylinder and piston assembly for KTM 250 SX, MXC, and EXC models, featuring a 66.4mm standard bore size for restoring engine compression and performance.

Overview

This top end kit is designed for KTM 250 two-stroke engines, delivering a direct replacement top end assembly with a 66.4mm standard bore. It includes the piston, rings, pin, and clips needed for a full top end rebuild, making it ideal for restoring power and reliability to your KTM 250 SX, MXC, or EXC.

Built For Performance

• Standard bore size of 66.4mm matches OEM specifications
• High-quality piston and ring set for consistent compression
• Precision-machined cylinder for accurate fitment
• Includes all necessary hardware for installation
• Designed for long-lasting durability in off-road conditions

Fits These Machines

• for KTM 250 SX
• for KTM 250 MXC
• for KTM 250 EXC

On-The-Job Use

• Rebuilding top end on a KTM 250 two-stroke dirt bike
• Restoring lost compression and performance
• Replacing worn piston and cylinder after high hours
• Preparing engine for competition or trail riding

Specs At A Glance

Good To Know

Q: Does this kit include the cylinder? A: This top end kit includes the cylinder, piston, rings, pin, and clips – everything needed for a complete top end rebuild.

Q: What years does this fit? A: This kit is compatible with specific model years of the KTM 250 SX, MXC, and EXC; always confirm your engine's bore size and serial number before ordering.

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