Athena 070200 Big Bore Cylinder Kit with Head (47.6mm, 70cc) 10mm Pin Domed Head Piston Performance Upgrade, Converts 50cc to 70cc, Compatible with Yamaha Zuma 50 & Vino 50 Blackhawk Cleaners Adaptable fastening range: up to and detailed installation instructions Adaptable fastening range: up to 300 ft lbs of fastening torque and 450 ft lbs of breakaway torque This coffee is roasted fresh and a specific high tightness gasket set—allowing you to dramatically increase top end speed and low end torque without requiring any structural engine modifications to your original factory crankcase and optimal wear resistance to deliver a substantial increase along the entire power curve while maintaining strict reliability