NCY Idle Screw (CVK Carb); GY6, 139QMB
NCY Idle Screw (CVK Carb); GY6, 139QMB
$22.63
8 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
NCY Idle Screw for CVK Carburetors; GY6, 139QMB
Compatibility
Fits many 139QMB-based 50cc / 80cc scooter engines. Confirm measurements, connector style, and engine family before ordering.
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc, GY6
- Engine Code: 139QMB
- Fitment Notes: Auto Transmission
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 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 0.3 lbs |
|---|---|
| Dimensions | 4.5 × 3.5 × 1 in |
Tool-Free Tuning: NCY Performance Idle Adjustment Screw
Stop fumbling for a screwdriver every time the weather changes. The NCY Idle Adjustment Screw replaces the difficult-to-reach stock screw on your CVK carburetor
Key Features & Benefits
- Superior Vibration Resistance: Includes a high-tension spring designed to hold your settings securely, even on high-vibration GY6 engines.
- Durable Brass Construction: Precision-machined for smooth threading and long-term resistance to fuel and heat corrosion.
- Universal CVK Fitment: Designed specifically for the constant-velocity (CVK) style carburetors found on most modern 4-stroke scooters.
Technical Specifications
- Compatibility: CVK / GY6 Style Carburetors
- Material: Machined Brass
- Spring Included: Yes (High-Tension Steel)
- Installation: Direct replacement for OEM idle screw.
Confirmed Vehicle Fitment
This idle screw fits 50cc to 170cc 4-stroke engines utilizing a CVK carburetor:
| Engine Type | Popular Models |
|---|---|
| GY6 125cc / 150cc | Genuine Buddy 125/150 Wolf EX-150, TaoTao Lancer |
| 139QMB / QMB139 | TaoTao Powermax, Wolf Blaze II, Etc. |
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Mechanic's Note: When installing, ensure the engine is warm. Screw the new NCY idle screw in until the engine stays running at a steady RPM (typically 1,600–1,900 RPM for GY6). If your bike "dies" at stoplights, this is the quickest fix to keep your engine alive.
SKU: 1300-1003 | Manufacturer: NCY | Part Number: 619N14CVK
