PISTON KIT 86-96 CR250 66.40 A, WOSSNER 8021DA HONDA MX

Wossner Forged Piston Kit 66.40mm Bore – Honda CR250R (1986–1996)
This Wossner forged piston kit is designed for Honda CR250R models produced between 1986 and 1996. Featuring a standard bore size of 66.40 mm and a piston diameter of 66.34 mm, it is engineered for 2-stroke performance with an emphasis on strength and heat management. The elliptical design reduces localised pressure, distributes thrust loads evenly, and prevents piston collapse under expansion. Manufactured in Germany for consistent precision and durability.

Features

• Forged piston design ensures superior strength and resilience

• Engineered for efficient heat transfer to cylinder walls

• Elliptical geometry promotes even load distribution and reduces wear

• Manufactured in Germany to high precision standards

Specifications

• Bore Size: 66.40 mm

• Piston Diameter: 66.34 mm

• Engine Displacement: 249 cm³

• Stroke: 72.00 mm

• Clearance: 0.06 mm

• Compression Height: 38.00 mm

• Compression Ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM and Equivalent Part Numbers

• 13100-KS7-000

• 09104727

• 614M06640

Cross-Reference Wossner Part Numbers

• Piston Kit: 8021DA

• Lock: CW18

• Pin: WP033

• Ring Set: RSB6640 x 2

• Rod: P2021

Vehicle Fitments

• 1986 Honda CR250R

• 1987 Honda CR250R

• 1988 Honda CR250R

• 1989 Honda CR250R

• 1990 Honda CR250R

• 1991 Honda CR250R

• 1992 Honda CR250R

• 1993 Honda CR250R

• 1994 Honda CR250R

• 1995 Honda CR250R

• 1996 Honda CR250R