Naraku V2 90cc Cylinder Kit with Head (GY6 50cc 139QMB / 139QMA)

The Naraku V2 90cc Cylinder Kit with cylinder head is an excellent solution for significantly increasing the performance of GY6 50cc 139QMB and 139QMA engines.

Thanks to its 52.4 mm aluminum cylinder and specific cylinder head with pre-assembled valves, this kit offers a significant gain in torque, acceleration, and improved top speed when properly tuned.

Designed for high-performance setups, it is an ideal upgrade for GY6 scooters wishing to benefit from a larger displacement while maintaining excellent reliability.

Technical specifications:

• Brand: Naraku
• Model: V2
• Type: Cylinder kit with cylinder head
• Displacement: 90cc
• Bore: 52.4 mm
• Cylinder material: Aluminum
• Cylinder head included
• Pre-assembled valves
• Compatible with GY6 50cc engines 139QMB / 139QMA

Kit contents:

• Naraku V2 Cylinder
• Complete cylinder head
• Piston
• Piston rings
• Piston pin
• Circlips
• Gaskets required for installation

Common terms:
big bore kit, 90cc kit, GY6 cylinder kit, Naraku V2.