High Performance Transmission & Variator Kits

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Dr. Pulley QMB139 Variator Kit for QMB139 50cc 4-stroke Engines

  • Specially Designed Ramp Shape
  • Extended Ramp Length
  • Adjustable Boss Length
  • Racing Type Ramp PlateIncludes Instructions
  • Includes Rear Plate Sliders
    Does Not Include Roller or Slider Weights

$114.99

Hoca QMB139 Performance Transmission Kit for QMB139 50cc 4-stroke Engines

  • 1500 RPM Spring
  • Spring Inner Diameter: 49mm
    Spring Height: 107mm
  • Roller Weight Size: 16x13mm (8g)
    Variator Outer Diameter: 87mm
  • Clutch Drum Number of Splines: 22
  • Clutch Drum Spline Inner Diameter (peak to peak): 11.10mm
  • Sliding Clutch Plate Outer Diameter: 119mm
  • Drive Plate Number of Splines: 26
  • Drive Plate Spline Inner Diameter (peak to peak): 13mm
  • Drive Plate Outer Diameter: 113mm
$169.99

Hoca Performance Transmission Kit for 150cc GY6 4-stroke Engine Based Vehicles

  • Clutch: Overall Outer Diameter: 120mm / Increases contact surface to the clutch drum / Reduces clutch slipping
  • Drive Plate: Number of Splines: 19 / Overall Outer Diameter: 115mm
  • Torque Spring: 1500 RPM / Total Length: 120mm / Inner Diameter: 49.5mm
  • Racing Variator: Outer Diameter: 115mm / Inner Diameter: 24mm / Includes 12 Gram Roller Weight
$189.99

GY6 Racing Variator Kit for 150cc 4-stroke Engines

  • Outer Diameter: 115mm
  • Inner Diameter: 24mm
  • Includes 12 Gram Roller Weights

$39.99