NCY
NCY Performance Clutch Springs, Set of 3 - 139QMB 50cc GY6
Description
These NCY Performance Clutch Springs (SKU 1200-1052) are one of the most effective upgrades for 139QMB (QMB139) 50cc scooters, the Chinese GY6 50cc platform based on Honda's GY6 design. Stiffer clutch springs make the clutch engage at a higher engine RPM, so the scooter launches in the meat of its powerband for noticeably quicker acceleration off the line. Each set includes three springs.
This product is intended for off-road use only. This product is not intended for use on public roads or land.
Key Features
- Quicker launches: Higher clutch engagement RPM puts more power to the ground from a stop.
- Three stiffness options: Choose 1000, 1500, or 2000 RPM to dial in your setup.
- Complete set: Three springs, one for each clutch shoe.
- Color-coded: Blue, yellow, or red for easy identification.
Technical Specifications
- Part number: 1200-1052
- Quantity: Set of 3
- Ratings available: 1000 RPM (blue), 1500 RPM (yellow), 2000 RPM (red)
- Engine: 139QMB / QMB139 50cc 4-stroke
- Brand: NCY
Spring Color Guide
| Color | Engagement RPM | Best For |
|---|---|---|
| Blue | 1000 RPM | Stock / low-end engagement |
| Yellow | 1500 RPM | Street / medium engagement |
| Red | 2000 RPM | Race / high-RPM engagement |
Compatibility
| Engine | Engine Codes |
|---|---|
| GY6 50cc 4-stroke | 139QMB, QMB139 |
Check the engine code stamped on your engine case before ordering. Engines marked 139QMB may use this part, but compare your original clutch springs with the photos to confirm fit.
Tuning Guide
A higher RPM rating means a stiffer spring and later clutch engagement. Blue keeps engagement smooth for stock or lightly modified scooters, yellow is a good all-around street choice, and red gives the hardest launches on a built race setup. If your scooter bogs from a stop, go stiffer. If it slips or revs too high before moving, go softer.
Product Diagrams
Features
Specifications
Part Number: 1200-1052 | Quantity: Set of 3 | Ratings: 1000 RPM blue (stock), 1500 RPM yellow (street), 2000 RPM red (race) | Engine: 139QMB 50cc 4T | Brand: NCY
Model Fitments
139QMB / QMB139 GY6 50cc 4-stroke scooters
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
