139QMB GY50 50cc starter motor — front/side view showing 10-tooth spline, two-bolt mounting flange, and ring terminal lead 139QMB GY50 50cc starter motor — front/side view showing 10-tooth spline, two-bolt mounting flange, and ring terminal lead
139QMB GY50 starter motor — opposite angle showing motor body, spline end, and ring terminal wire 139QMB GY50 starter motor — opposite angle showing motor body, spline end, and ring terminal wire
139QMB GY50 starter motor — rear view showing motor can, brush plate, and single-wire lead 139QMB GY50 starter motor — rear view showing motor can, brush plate, and single-wire lead
139QMB GY50 starter motor — top-down view showing mounting flange bolt holes and spline alignment 139QMB GY50 starter motor — top-down view showing mounting flange bolt holes and spline alignment
QMB139 Starter Motor QMB139 Starter Motor
139QMB GY50 50cc starter motor — front/side view showing 10-tooth spline, two-bolt mounting flange, and ring terminal lead
139QMB GY50 starter motor — opposite angle showing motor body, spline end, and ring terminal wire
139QMB GY50 starter motor — rear view showing motor can, brush plate, and single-wire lead
139QMB GY50 starter motor — top-down view showing mounting flange bolt holes and spline alignment
QMB139 Starter Motor

Chicago Scooter Company

Blue Line 139QMB / GY6 50cc Starter Motor

SKU 1100-1309
$34.00
Shipping calculated at checkout.
Description

OEM-replacement 12V electric starter motor for 139QMB / GY50 50cc 4-stroke engines. Direct bolt-on replacement for a clicking, dead-spot, or failed starter. 10-tooth spline for smooth engagement with the starter bendix, 70mm bolt hole spacing, and a single-wire ring terminal lead. Ensure the mounting surface is clean for a solid electrical ground through the engine case. SKU: 1100-1309.

Key Features

  • 12V DC high-torque motor for consistent cold-weather cranking
  • 10-tooth spline for smooth engagement with the starter bendix
  • 70mm center-to-center bolt hole spacing
  • Single-wire ring terminal lead — plug-and-play with existing starter relay harness
  • Direct OEM replacement for 139QMB / GY50 50cc engines

Specifications

  • Voltage: 12V DC
  • Spline Count: 10-tooth
  • Bolt Hole Spacing: 70mm (center to center)
  • Connection: Single-wire ring terminal
  • SKU: 1100-1309

Compatibility

Brand Models
Chicago Scooter Co. go., go. MAX, Pug 50, Nitro Sport 50, Bella Classic 50
Universal Any 139QMB / 1P39QMB / GY50 50cc 4-stroke scooter

California Prop 65 Warning: www.p65warnings.ca.gov
Product Diagrams
Features
  • 12V DC high-torque motor for consistent cold-weather cranking
  • 10-tooth spline for smooth engagement with the starter bendix
  • 70mm center-to-center bolt hole spacing
  • Single-wire ring terminal lead — plug-and-play with existing harness
  • Direct OEM replacement for 139QMB / GY50 50cc engines
Specifications

Voltage: 12V DC | Spline: 10-tooth | Bolt Spacing: 70mm C-C | Connection: Single-wire ring terminal | SKU: 1100-1309
Model Fitments

CSC go., go. MAX, Pug 50, Nitro Sport 50, Bella Classic 50; Universal 139QMB / 1P39QMB / GY50 50cc 4-stroke scooters
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