The "B" size piston (D.47mm, 10mm pin) for Stage6 70cc Street Race cylinders, engineered for vertical Minarelli scooter engines including MBK Booster, Yamaha BW's, Slider, and Stunt models.

Replace your piston when power drops or compression weakens to restore engine performance. This genuine Stage6 component maintains optimal engine function through regular upkeep.

Complete package includes : 47mm piston, 2x piston rings, B-ring, 10mm piston pin, and circlips. 

Always order a top-end gasket set when disassembling.

Stock engines typically need piston replacement at 10,000 km. Tuned and sport-series kits require earlier service — replace between 5,000–7,500 km for sustained performance.