Product Name: 50cc New 4 Valve Motorcycle Engine Model NO.: Z50 Main Market: North America Four Stroke Principle: Combustion and Expansion of Power Stroke Thermal Machine: Internal Combustion Type Certification: ISO9001?2000 Energy Transformation: Power Machine Cold Style: Air-Cooled Stroke: Four Stroke Cylinder NO.: 1 Cylinder Start: Electric/Kick Type: Motorcycle Engine Assembly 4 Stroke Engine: 4 Valve Gpx: 4 Valve Yx: 4 Valve Start Type: Electric and Kick Transport Package: Carton Box Specification: 450mmx360mmx260mm Origin: China HS Code: 8407310000 Product Description 50cc 4 valve engine, more powerfulKick & electric startAir cooling4 stroke, 1 cylinderAutomatic Clutch3-speed Gearshift (4-gears optional)