Kick Start Idle Shaft Gear (7 Spline) for GY6 49cc 50cc 80cc QMB139 Scooter ATV

Product Overview

Eliminate starting friction and restore your engine's ignition efficiency with the GOOFIT High-Strength 7-Tooth Idle Shaft Gear. Engineered specifically for 4-stroke GY6 49cc to 100cc (QMB139) Chinese-made engines, this gear is the heart of a smooth kick-start system.

Standard gears often fail due to the intense mechanical shock of kick-starting. Our gear features heat-treated steel to maximize surface hardness and abrasion resistance. Whether you are maintaining a TaoTao, Baja, or Roketa, this precision component reduces resistance during the start-up stroke, ensuring your scooter or ATV fires up reliably every time.

Product Compatibility

Direct replacement for 4-stroke QMB139 series engines. Please verify your spline count (7 teeth) before ordering.

Engine Type	Compatibility	Popular Brands
GY6 4-Stroke	49cc, 50cc, 80cc, 100cc	TaoTao, Baja, Roketa
Engine Code	QMB139 / P139QMB	Ice Bear, Peace Sports, Wolf
Vehicle Types	Scooters, Mopeds, ATVs	Various Chinese 4-stroke Imports

Specifications

Precision measurements for guaranteed fitment.

Feature	Detail
Spline Count	7 Teeth (7 Spline)
Gear Diameter	26mm (1.02")
Material	Heat-Treated Hardened Steel
Process	Hardened Surface for Anti-Abrasion
Package Includes	1x Kick Start Idle Shaft Gear

Key Features

• Optimized 7-Tooth Design: Specifically manufactured for engines requiring the 7-spline configuration. The precise tooth geometry ensures a tight bite with the kick start spindle, preventing slippage and energy loss.
• Heat-Treated for Longevity: The high-grade steel undergoes a rigorous heat-treatment process. This significantly increases hardness and wear resistance, allowing the gear to withstand thousands of start cycles without deforming.
• Reduced Starting Resistance: By optimizing the gear's rotational balance and surface finish, this part improves starting efficiency, making the kick-start motion feel lighter and more responsive.
• Strict Quality Control: Every component is subjected to professional performance testing. We ensure that the gear meets optimum standards for stability and impact resistance, reducing the need for frequent maintenance.
• Universal Fit for QMB139: A perfect "drop-in" solution for most Chinese-made 4-stroke scooters and ATVs. It directly replaces damaged factory gears to restore original vehicle performance.