Universal Parts QMB139 Cylinder & Head Kit - 69mm Valves Made-in-Japan Performance Kit Includes:

Performance Kit Includes:

7-Pin Connector Configuration: Features the specific wiring harness required for mid-generation Razor E-series models

Country of Origin: China

use a spanner wrench (sold separately) to compress the spring for a firmer ride or loosen it for more comfort

Universal Parts QMB139 Cylinder & Head Kit - 69mm Valves Made-in-Japan Performance Kit Includes:50cc QMB139 4 stroke Cylinder and Head Kit With 69mm Valves. Choose from 39mm, 47mm or 50mm bore in the Drop Down Box. 47mm Bore Upgrades your Scooter to 72cc! 50mm Bore Upgrades your Scooter to 81. 3cc! Kit includes complete cylinder head, cylinder, piston, rings, piston pin, cir clips, head gasket, and base gasket. *You may need to modify your engine case to accommodate the larger cylinder. Cylinder Bore: Choose from 39mm, 47mm or 50mm Cylinder