Wossner forged Piston kitRef : WO00222A / 1093659001

WÖSSNER Forged Piston – Manufacturer Ref. 8264D100

Designed and manufactured in Germany by Wossner, this forged piston is aimed at motocross riders looking for a stock engine part suitable for restorations and modifications requiring a specific size. Machined from aluminum, it features a friction-treated skirt to minimize wear against the cylinder and ensure smooth operation.

• Type: forged piston
• Material: aluminum
• Piston diameter: Ø 85.920 mm (bore 86.00 mm)
• Oversize letter: 100 (Ø 85.92 mm)
• Compression: standard
• Delivered with ring(s), circlips, and pin

Suitable for the motocross environment, this piston is compatible with the listed YAMAHA models (IT 425 1980, YZ 400 Competition 1978–1979): however, please check the exact compatibility with your engine and bore before installation. The piston is supplied ready for installation with the necessary assembly components to replace the worn part or to perform a complete cylinder overhaul.

Before installation, check the piston/cylinder clearance and adhere to the manufacturer's recommendations for breaking in and torque specifications. A precise replacement part for mechanical work on 2-stroke and 4-stroke engines intended for off-road use.