WÖSSNER Forged Piston (manufacturer part number: 8646D050) — forged aluminum piston developed in Germany for 2-stroke and 4-stroke engines. Designed for off-road and motocross applications, this piston offers high-quality construction for rebuilding or maintaining a bottom end. Ideal for riders looking for a robust engine part that is precisely sized.
- Bore diameter: 73.50 mm
- Piston diameter: Ø 73.450 mm (Ø 73.45 mm)
- Oversize: +0.50 mm (letter 050)
- Material: forged aluminum
- Number of rings: 3
- Anti-friction treatment on the skirt
- Delivered with ring(s), circlips, and pin
The Wössner piston is machined and treated to ensure a precise fit in the cylinder. Its treated skirt reduces friction during startup and operation, facilitating break-in and engine maintenance. Particularly suitable for motocross applications where machining consistency and dimensional stability are important.
Notable compatibility: YAMAHA TT-R 250 (2005–2007) — check the part number and bore tolerances before installation. Professional installation is recommended if you are not equipped to check ring gap, pin alignment, and bore tolerances.
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