ATHENA S5F08500001B Replacement Piston Kit for Honda P400210100067 BB Cylinder Kit

Experience maximum strength and reliable performance with an Athena Forged Big Bore Piston Kit. Manufactured using advanced reverse extrusion and precision CNC machining, this forged high-silicon aluminum piston is designed specifically for Athena Big Bore cylinders. Engineered and tested in Italy, it delivers outstanding durability, reduced friction, and smooth power delivery for demanding enduro and off-road applications.

• Forged high-silicon aluminum piston engineered for Athena Big Bore cylinders
• Precision CNC-machined to tolerances under 0.01mm for exceptional fit and performance
• Molybdenum disulfide skirt coating reduces friction and minimizes engine wear
• Japanese-made piston rings feature wear-resistant coatings for improved sealing and extended service life
• Dyno and track tested in Italy to ensure race-proven durability and reliability
• Ideal for high-performance enduro and off-road engine builds

Includes:

• Forged Piston
• Piston Rings (2)
• Wrist Pin
• Circlips

• Displacement: 289cc
• Piston Size: 84.95mm
• Piston Type: Forged
• Piston Head: Flat
• Piston Pin: Biconical
• Wrist Pin Dimensions: 16 x 9 x 44.3mm
• Compression Height: 18.90mm
• Forged Side Relief Skirt
• Designed for Athena Big Bore cylinder kits
• Intended for competitive or high-performance off-road applications where permitted by local regulations

The ATHENA S5F08500001B is a replacement piston kit designed for use with the P400210100067 BB cylinder kit. It provides a product-specific replacement solution for the cylinder kit application identified in the product data.

This kit is associated with Honda fitment as stated in the product name. Use the ATHENA part number to verify that it matches your existing cylinder kit and service requirements before ordering.

Supplied as one each, the S5F08500001B replacement piston kit is intended for maintenance or replacement needs involving the specified P400210100067 BB cylinder kit.

Features:

• Brand: ATHENA
• Part Number: S5F08500001B
• Product Type: Replacement piston kit
• Application: P400210100067 BB cylinder kit
• Fitment Reference: Honda
• Unit of Measure: Each