Namura Standard Bore Size C Top End Kit for KTM 250 2-Stroke 2017-2021 66.4mm

Namura Standard Bore Size C Top End Kit for KTM

This Namura Standard Bore Size C Top End Kit provides a complete top end rebuild solution for the KTM 250 2-Stroke engine, featuring a 66.4mm piston and all necessary hardware. Designed for the 2017-2021 model years, this top end kit restores cylinder performance and compression for reliable off-road riding.

Overview

This Namura Standard Bore Size C Top End Kit is a precision-engineered rebuild set for the KTM 250 2-Stroke (2017-2021), including a size C piston, rings, wrist pin, circlips, and gasket kit. With a 66.4mm standard bore diameter, this top end kit ensures a direct fit and smooth operation for your dirt bike. Ideal for motocross, enduro, and trail riding, this top end kit brings your KTM back to peak performance.

Built For Performance

• Includes a forged or cast aluminum piston with advanced ring groove design
• Features precisely gapped rings for optimal compression and blow-by control
• Supplied with a hardened wrist pin and high-quality circlips
• Gasket set includes cylinder base, head, and exhaust port gaskets
• Piston size C offers exact fit for standard 66.4mm bore

Fits These Machines

• for KTM 250 2-Stroke (2017-2021)

On-The-Job Use

• Motocross racing on tracks
• Enduro and cross-country trail riding
• Recreational trail riding on single-track
• Competition and practice riding

Specs At A Glance

Good To Know

Q: Is this kit suitable for a 2-stroke rebuild? A: Yes, it includes everything needed for a top end rebuild on a 2-stroke KTM 250 engine, including piston, rings, pin, circlips, and gaskets.

Q: Do I need any additional parts for installation? A: You will need standard tools and a torque wrench; cylinder honing may be required if bore wear is present.

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