• Kick Start Idle Shaft Gear (8 Spline) for GY6 49cc 50cc QMB139 Scooter ATV - goofitmoto
  • Kick Start Idle Shaft Gear (8 Spline) for GY6 49cc 50cc QMB139 Scooter ATV - goofitmoto
  • Kick Start Idle Shaft Gear (8 Spline) for GY6 49cc 50cc QMB139 Scooter ATV - goofitmoto
  • Kick Start Idle Shaft Gear (8 Spline) for GY6 49cc 50cc QMB139 Scooter ATV - goofitmoto
  • Kick Start Idle Shaft Gear (8 Spline) for GY6 49cc 50cc QMB139 Scooter ATV - goofitmoto
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GOOFIT

Kick Start Idle Shaft Gear (8 Spline) for GY6 49cc 50cc QMB139 Scooter ATV

Kick Start Idle Shaft Gear (8 Spline) for GY6 49cc 50cc QMB139 Scooter ATV

$8.99
$8.99
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Product Overview

Restore smooth and reliable starting to your scooter with the GOOFIT Heavy-Duty Kick Start Idle Shaft Gear. Designed specifically for the 4-stroke GY6 49cc/50cc (QMB139) engine, this 8-spline gear is the essential replacement part for fixing common kick-start slipping and grinding issues.

When your kick starter feels loose or fails to engage the engine, a worn idle gear is often the culprit. Our gear is forged from high-quality CNC aluminum alloy, providing the strength and rust-proof durability needed to withstand the mechanical stress of repeated starting. It is a direct fit replacement built to strict quality standards, ensuring a quick and easy DIY installation.

Product Compatibility

Direct replacement for most Chinese 4-stroke GY6 50cc scooters, ATVs, and Quads.

Engine Type Common Vehicle Applications Fitment Notes
GY6 49cc / 50cc TaoTao, Ice Bear, Wolf, Peace Sports, VIP 8 Spline Only
QMB139 (4-Stroke) Roketa, SunL, Tank, Gator, Bintelli 10mm Shaft Fit
Vehicle Types Scooters, ATVs, 4-Wheelers, Quads Check Spline Count

Specifications

Please carefully verify your original gear dimensions before ordering.

Feature Detail
Spline Count 8 Spline
Shaft Diameter 10mm (0.39")
Outer Diameters 20mm (0.78") & 33.5mm (1.31")
Material Forged CNC Aluminum Alloy
Properties Rust-Proof, High-Strength, Anti-Wear

Key Features

  • Forged Strength: Unlike standard cast gears, our idle gear is forged with high-quality CNC aluminum alloy. This process ensures a denser, stronger material that resists tooth-chipping and spline-stripping.
  • 8-Spline Precision Fit: Specifically designed with an 8-spline configuration to match the factory QMB139 kick start spindle. This ensures perfect engagement and prevents power loss during the kick-starting motion.
  • Rust-Proof & Durable: The advanced alloy material is naturally corrosion-resistant, protecting the gear from moisture and road grime trapped inside the CVT cover, significantly prolonging service life.
  • Direct OEM Replacement: Built to meet or exceed strict quality standards. It is designed to be a "drop-in" replacement for your old or damaged gear, requiring no modifications to your transmission assembly.
  • Improved Starting Response: A fresh gear with sharp splines provides instant grip, reducing the effort needed to kick-start your engine and protecting other internal transmission components from unnecessary wear.
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Fitment FAQ

Will this part fit my specific model and year?

This replacement part is intended for Direct replacement for most Chinese 4-stroke GY6 50cc scooters, ATVs, and Quads.; Engine Type; Common Vehicle Applications. Key physical/spec details from the product data include Shaft Diameter: 10mm (0.39"), Outer Diameters: 20mm (0.78") & 33.5mm (1.31"), 49cc. Use the compatibility table and product photos together before ordering.

Do I need to match the OEM part number?

Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this replacement part, also compare the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. This is especially important for GY6 GY6/QMB139 models because similar model names can use different parts by year or trim.

What models or situations does this part not fit?

Do not order this replacement part for machines outside the listed compatibility, or for units with different OEM numbers, dimensions, mounting points, connectors, or year-specific configurations. Do not rely only on the model name or engine size.

What should I check before ordering?

Before ordering, compare your original part with the photos and check the OEM number, dimensions, connector or mounting style, engine/model year, and product photos. Recheck listed specs such as Shaft Diameter: 10mm (0.39"), Outer Diameters: 20mm (0.78") & 33.5mm (1.31"), 49cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.