Naraku QMB139 Variator Drive Face
Naraku QMB139 Variator Drive Face
$88.44
10 in stock
*Note: Free shipping to U.S. mainland (excludes AK, HI, and territories)
Orders placed by 1pm EST on weekdays ship the same day.
Product Details
Description
Naraku Performance Variator Drive Face: 139QMB / GY6 50
Key Details
- NK900.59
Specifications
- Number of Splines: 26 Does Not Include Kick Start Gear or Fan QMB139 50cc/49cc , Various unlisted makes/models
Replacement Part Details
Use this part when the original component is worn, damaged, missing, or no longer working correctly. Many scooter parts can look similar but use different sizes, plugs, brackets, thread patterns, or mounting styles, so careful comparison before purchase is recommended.
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 49cc, 50cc, GY6, QMB139
- Engine Code: QMB139, 139QMB
- Fitment Notes: Performance, Kick Start
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a QMB139 engine?
A: This SKU is listed as compatible with QMB139 engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 49cc scooters?
A: This SKU is listed with 49cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 0.8 lbs |
|---|---|
| Dimensions | 7 × 7 × 3 in |
| Condition | New |
|---|
Eliminate belt slip and improve throttle response with the Naraku CNC Machined Performance Variator Drive Face. Engineered specifically for the 50cc QMB139 (GY6) engine platform, this red anodized aluminum drive face is precision-machined to ensure a perfectly flat contact surface, maximizing belt grip and efficiency throughout the entire RPM range. A direct upgrade over the stock cast face, which develops grooves over time that kill top speed and gear ratio transitions.
Model Compatibility
Fits the 139QMB / QMB139 engine family found in most 50cc 4-stroke Chinese scooters:
- Engine codes: 139QMB | 1P39QMB | 139QMA
- Brands: TaoTao, Wolf, Ice Bear, Bintelli, Kymco, SYM, and other GY6 50cc platforms
Key Features
- CNC Machined Surface: High-precision finish optimizes the belt's contact patch, reducing friction-based heat and preventing belt slip.
- Red Anodized Finish: Specialized anodizing improves heat dissipation, extending the life of your drive belt and variator rollers.
- 26-Spline Center Hub: Manufactured to exact OEM tolerances for a rock-solid crankshaft connection.
- OEM Component Compatible: Works with stock electric start, kick start components, and factory plastic cooling fan.
Technical Specifications
- Material: CNC machined aluminum
- Finish: Red anodized
- Spline Count: 26
- SKU: 137-29 | MPN: NK900.59
Mechanic's Note: The drive face is the outer half of your CVT pulley system. Over time, the stock face develops grooves from the belt that kill top speed — replacing it with this Naraku unit restores original gear ratio transitions. Note: Does NOT include the kick start gear or cooling fan — swap those over from your old unit during installation.
