Blue Line left handlebar switch and brake lever assembly, SKU 0800-4001, for 139QMB 50cc scooters with headlight high/low rocker, turn signal slide, red horn button and pre-wired connectors. OEM for CSC go. Blue Line left handlebar switch and brake lever assembly, SKU 0800-4001, for 139QMB 50cc scooters with headlight high/low rocker, turn signal slide, red horn button and pre-wired connectors. OEM for CSC go.
Blue Line left handlebar switch and brake lever assembly, SKU 0800-4001, for 139QMB 50cc scooters with headlight high/low rocker, turn signal slide, red horn button and pre-wired connectors. OEM for CSC go.

Blue Line

Blue Line Left Switch & Brake Lever - 139QMB 50cc Scooters

SKU 0800-4001
$27.00
Shipping calculated at checkout.
Description

This Blue Line Left Handlebar Switch & Lever Assembly (SKU 0800-4001) is a direct replacement left-side control for many 139QMB (QMB139) 50cc scooters, the Chinese GY6 50cc platform based on Honda's GY6 design. It fits the common left switch layout used across a wide range of these scooters, including Chicago Scooter Company models like the go., go MAX, Pug 50, Nitro Sport 50, and Bella Classic 50. It combines the rear brake lever with the headlight, turn signal, and horn switches in one pre-wired housing. Replace it if a switch has stopped working, the lever is bent or broken, or the housing is cracked.

Key Features

  • All-in-one assembly: Brake lever and switch housing in one unit.
  • Headlight high/low rocker: Switches between high and low beam.
  • Turn signal slide: Left/right with center-push cancel.
  • Red horn button: Easy to find with your thumb.
  • Pre-wired: Two plug-in connectors plus brake light switch leads.

Technical Specifications

  • Part number: 0800-4001
  • Position: Left handlebar
  • Controls: High/low beam, turn signals, horn
  • Includes: Brake lever, switch housing, wiring harness
  • Connectors: Two multi-pin plugs, two bullet terminals
  • Brand: Blue Line

Compatibility

Make Models
Chicago Scooter Company (CSC) go., go MAX, Pug 50, Nitro Sport 50, Bella Classic 50
Other 139QMB scooters Many 50cc models from brands such as Baotian, BMS, Jonway, Peace Sports, Roketa, TaoTao, Tank, Vento, Wolf, and ZNEN

 

This assembly fits many 139QMB scooters with the common left switch layout, but handlebar controls can vary by model. Before ordering, compare your original switch's buttons, lever shape, and wiring connectors with the photo to confirm fit.
Product Diagrams
Features
  • Brake Lever and Switch Housing in One Assembly
  • Headlight High/Low Beam Rocker
  • Turn Signal Slide with Push Cancel
  • Red Horn Button
  • Pre-Wired Plug-In Connectors
Specifications

Part Number: 0800-4001 | Position: Left handlebar | Controls: Hi/lo beam, turn signals, horn | Includes: Brake lever, switch housing, wiring | Connectors: Two multi-pin plugs, two bullet terminals | Brand: Blue Line
Model Fitments

Many 139QMB / QMB139 GY6 50cc scooters with the common left switch layout, including CSC go., go MAX, Pug 50, Nitro Sport 50, Bella Classic 50 (left handlebar)
  • Same day shipping for orders placed before 2PM (CST) M-F
  • 30-day return period on eligible items
  • Flat-rate shipping for orders shipped to the 48 Contiguous United States.
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