WÖSSNER Pro Series Forged Piston (manufacturer part no. 8590DA) – specially designed for motocross, this forged piston from the Pro Series is manufactured in Germany by Wössner specialists. Machined from aluminium and treated at the skirt to reduce friction, it meets the assembly requirements of both two-stroke and four-stroke engines.

• Type: forged piston, Pro Series range
• Compression: high compression
• Piston diameter: Ø 77.96 mm (piston) / bore diameter 78.00 mm
• Oversize letter: A
• Material: aluminium
• Finish: anti-friction treatment of the skirt
• Complete delivery: rings, circlips, and pin

This piston fits into motocross setups requiring an oversize A and high compression. Its forged construction provides a compact structure suitable for the thermomechanical stresses encountered in off-road use. The supplied components (rings, circlips, pin) facilitate replacement and adjustment of the cylinder/ring clearance during setup.

Known main applications: HONDA CRF 250 R (ME10) models 2007 to 2009 (250 cm3). Always check the dimensions and engine compatibility before installation to ensure a proper fit.