RDLN Racing Variator with Roller Tuning Kit; 139QMA, 139QMB
RDLN Racing Variator with Roller Tuning Kit; 139QMA, 139QMB
$60.94
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
RDLN Racing Variator with Roller Tuning Kit; 139QMA, 139QMB
Specifications
- Length: 38mm||Roller Weight Size: 16x13mm||Set of 6 Roller Weights: 6g each||Set of 6 Roller Weights: 7g each||Set of 6 Roller Weights: 8g each||||||Compatibility: ||||||139QMB-based 50cc / 80cc engines with the following engine codes:||||||139QMA||139QMB||1P39QMB||1P39QMA-2||||YN139QMB||JJ1P39QMB||139FMA-2||BD1P39QMB||||BN139QMB||147QMD||Other QMA models||Other QMB models|||||Don’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.|||Roller Weight Tuning Kit information:||||Alternating different roller weights allows you to fine-tune your engine output characteristics. For example, by alternating 3- 7g rollers and 3- 8g rollers in the variator, you can achieve a 7.5g roller set.||Lighter weights increase RPMs for a given road speed, while heavier weights lower RPMs for a given road speed.||Tailor your tuning to match your engine setup and personal driving style.||||*DANGER: Weights must be installed in a 120-degree pattern! If not, SEVERE ENGINE DAMAGE WILL RESULT!!!||||About RDLN:| RDLN is a premier line of aftermarket performance upgrade systems and components for scooters. RDLN products are engineered to significantly improve the function, performance, and reliability of your vehicle with the ultimate goal being an optimal balance of price, power, and performance. RDLN’s extensive field-testing network ensures each product exceeds customer requirements and expectations every time. RDLN delivers full-throttle performance at uncompromised quality.||This product is intended for off-road use only.||This product is not intended for use on public roads or land.||This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.|||*Performance upgrades are considered racing parts and are not covered by warranty.|||
Compatibility
Fits many 139QMB-based 50cc / 80cc scooter engines. Confirm measurements, connector style, and engine family before ordering.
Replacement Part Details
Use this part when the original component is worn, damaged, missing,
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc
- Engine Code: 1P39QMA, 1P39QMB, 139QMB, BN139QMB, YN139QMB
- Fits Models / Common Applications: Lance and other compatible models may apply.
- Fitment Notes: Performance
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 1P39QMA engine?
A: This SKU is listed as compatible with 1P39QMA engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Will this fit a Lance?
A: This SKU is listed with Lance model fitment where the scooter also matches the listed engine or fitment notes.
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 | 1 lbs |
|---|
| Condition | New |
|---|
Unlock the full performance potential of your 139QMB GY6 50cc scooter with the RDLN Racing Variator and Roller Tuning Kit. This complete drive pulley variator assembly includes three full sets of roller weights (6g, 7g, and 8g) so you can dial in the exact balance of acceleration and top speed for your engine setup and riding style.
Key Features
- Modified ramp plate — increases maximum power output over the stock variator
- Copper core roller weights — longer lasting than standard weights
- Wear-resistant nylon construction — durable under sustained CVT load
- Three roller weight sets included — 6g, 7g, and 8g (6 rollers per set) for full tuning flexibility
- Variator OD: 89mm
- Variator ID: 20mm
- Drive Boss OD: 20mm
- Drive Boss ID: 14mm
- Drive Boss Length: 38mm
- Roller Weight Size: 16×13mm
- Roller Sets: 6g ×6, 7g ×6, 8g ×6
Roller Weight Tuning Guide
- Lighter weights (6g) — higher RPM for a given road speed; better off-the-line acceleration
- Heavier weights (8g) — lower RPM for a given road speed; higher top speed
- Mix and match — alternate different weights to achieve intermediate values (e.g., 3×7g + 3×8g = effective 7.5g set)
- Tailor your tuning to match your engine setup and personal riding style
Safety Warning: If using different weights to achieve a half size, the roller weights must be installed in a 120-degree pattern. Incorrect installation will cause severe engine damage.
139QMB-based 50cc/80cc engines:
| Engine Code | Engine Code | Engine Code | Engine Code |
|---|---|---|---|
| 139QMA | 139QMB | 1P39QMB | 1P39QMA-2 |
| YN139QMB | JJ1P39QMB | 139FMA-2 | BD1P39QMB |
| BN139QMB | 147QMD | Other QMA | Other QMB |
Don't see your engine code? If it is a 49-80cc 4 Stroke engine and contains "QM" or "FM", this variator is compatible with your vehicle.
Performance upgrades are considered racing parts and are not covered by warranty. This product is intended for off-road use only and is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.
