Namura Size B Standard Bore Piston Kit for Honda CRF250R CRF250RX 2018-2019 79mm

Piston Kit (Size B Standard Bore) for Honda

This piston kit is a Namura Size B standard bore piston at 79mm for Honda CRF250R and CRF250RX models from 2018 to 2019, providing a direct replacement for OEM piston assemblies.

Overview

This Namura Size B standard bore piston kit is designed for Honda CRF250R and CRF250RX dirt bikes from 2018-2019, using a 79mm piston to restore factory compression and performance. It is an ideal choice for rebuilding the top end of a CRF250R or CRF250RX engine.

Built For Performance

• Precision-cast from high-silicon aluminum alloy for durability
• Size B classification ensures proper fit within factory tolerances
• Includes piston, rings, wrist pin, and circlips
• Standard bore 79mm matches stock cylinder dimensions
• Direct replacement for OEM piston assemblies

Fits These Machines

• for Honda CRF250R (2018-2019)
• for Honda CRF250RX (2018-2019)

On-The-Job Use

• Rebuilding a motocross engine for competitive racing
• Restoring top-end performance on a trail or enduro bike
• Performing routine top-end maintenance after hours of riding
• Replacing a worn or damaged piston during engine overhaul

Specs At A Glance

Good To Know

Q: Is the piston pre-assembled with rings and pin? A: The piston comes with rings and wrist pin included but not installed; they must be fitted during assembly.

Q: Will this standard bore piston work with a worn cylinder? A: It is designed for a cylinder within factory specifications; if the cylinder is worn or damaged, it may need to be honed or replaced.

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