Stage6 Streetrace 70cc Minarelli vertical pin=10mm

Stage6 Streetrace 70cc cast iron cylinder kit for Minarelli vertical engines (Yamaha BW's / Slider) with 10mm piston pin.

A budget-friendly, reliable alternative to the Sport Pro aluminium cylinder, delivering strong torque and increased top speed for daily riding.

This cast iron unit features a 5-port transfer layout plus simple exhaust port—nearly identical to the Sport Pro design but thermally optimized for cast iron durability. Paired with a quality 2-ring piston and HC cylinder head, it achieves approximately 10,000 rpm and 8–11 hp, outperforming comparable cylinders by 1–3 hp. Easy to maintain, with all spare parts readily available.

The cylinder maintains a stock appearance with discreet "49ccm" marking instead of branding. Full potential requires matching components from our recommendations.

• Cast iron cylinder, 47 mm
• 2-ring piston, 10mm pin
• Aluminium cylinder head
• Gasket kit and cylinder base gasket included
• Squish clearance pre-set
• No road approval

Break-in: approximately 300 km (150 km at half throttle, 150 km at three-quarters throttle)