NCY Secondary Gear Kit 16/42 (GY6 139QMB / 139QMA)

The NCY 16/42 secondary gear kit is designed to modify the final drive ratio of GY6 50cc 139QMB / 139QMA engines.

With its 16/42 ratio, it optimizes the transmission's behavior according to your engine setup, particularly for Big Bore or performance setups.

Performance gains:

• Higher top speed
  
• More efficient transmission
  
• Optimal use of modified engines
  
• Reinforced performance gears

Common terms:
gear up kit, secondary gears, final drive gears, transmission gear set.