Prima Roller Weight Tuning Kit (18×14, 6g to 17g) BUDDY 125/
Prima Roller Weight Tuning Kit (18×14): Buddy 125/150/170i
$56.75
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: This Prima Roller Weight Tuning Kit is the best way to dial in the CVT transmission on your Genuine Buddy or 157QMJ GY6 engine to suit your driving style.Specifications:12 sets of 3 rollers (36 total)18×14 rollersWeights from 6g to 17gCombining 2 sets of rollers lets you tune your transmission to suit your driving style (lighter weights = higher RPMs, heavier weights = lower RPMs)For example, using 3x 10g and 3x 11g rollers (alternating weights in variator) gives you 10.5g roller set.DANGER:Weights must be installed in an alternating pattern (120 degree angle). Otherwise, YOU WILL SEVERELY DAMAGE YOUR ENGINE!Compatibility:This product works with the bikes listed below and engines with the following engine codes.Genuine Blur 150Genuine Buddy 125Genuine Buddy 150Genuine Buddy 170SYM Fiddle 125157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:157QMJ161QMK152QMI1P61QMKYN1P57QMJ1P52FMI154FMIJJ157QMJ1P57QMJBN157QMJBN161QMK-AOther QMJ, QMK, and QMI modelsDon’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.About Prima:Prima is the industry leader in premium scooter accessories, service parts and scooterist protective apparel. Prima brand products are designed direct-fit for all popular scooter brands including Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, Royal Alloy and GY6 / QMB powered scooters.
SPECIFICATIONS: 12 sets of 3 rollers (36 total)18×14 rollersWeights from 6g to 17gCombining 2 sets of rollers lets you tune your transmission to suit your driving style (lighter weights = higher RPMs, heavier weights = lower RPMs)For example, using 3x 10g and 3x 11g rollers (alternating weights in variator) gives you 10.5g roller set.
COMPATIBILITY: This product works with the bikes listed below and engines with the following engine codes.Genuine Blur 150Genuine Buddy 125Genuine Buddy 150Genuine Buddy 170SYM Fiddle 125157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:157QMJ161QMK152QMI1P61QMKYN1P57QMJ1P52FMI154FMIJJ157QMJ1P57QMJBN157QMJBN161QMK-AOther QMJ, QMK, and QMI modelsDon’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.About Prima:Prima is the industry leader in premium scooter accessories, service parts and scooterist protective apparel. Prima brand products are designed direct-fit for all popular scooter brands including Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, Royal Alloy and GY6 / QMB powered scooters.
157QMJ ENGINES: GY6 engine to suit your driving style.
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 125cc, 150cc, GY6
- Engine Code: 157QMJ
- Fits Models / Common Applications: Genuine Buddy and other compatible models may apply.
- Fitment Notes: CVT, 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 157QMJ engine?
A: This SKU is listed as compatible with 157QMJ engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Will this fit a Genuine?
A: This SKU is listed with Genuine model fitment where the scooter also matches the listed engine or fitment notes.
Q: Is this for 125cc scooters?
A: This SKU is listed with 125cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 3 lbs |
|---|---|
| Dimensions | 10 × 7 × 1 in |
| Size | 18×14 |
| Condition | New |
|---|
Dial in your CVT with the Prima 18x14mm Roller Weight Tuning Kit. This master set includes 12 weight sets ranging from 6g to 17g — 36 rollers total — so you can test multiple configurations to find the perfect balance of acceleration and top speed for your riding style and engine setup. Mix sets for 0.5g increments (e.g., 3x10g + 3x11g = 10.5g effective). High-quality composite construction resists flat-spotting during tuning.
18x14mm is the standard roller size for many 125cc–170cc scooters.
What's Included
- 12 roller weight sets: 6g, 7g, 8g, 9g, 10g, 11g, 12g, 13g, 14g, 15g, 16g, 17g
- 3 rollers per set — 36 rollers total
| Roller Size | 18x14mm |
|---|---|
| Weight Range | 6g – 17g (12 sets) |
| Total Rollers | 36 |
| Engine Compatibility | Most 125cc–170cc variators |
| Brand | Prima |
Fitment
| Genuine Scooter Co. | Buddy 125, Buddy 150, Buddy 170i, Buddy Kick 125, Blur 150, Blur 220i |
|---|---|
| Royal Alloy / Lambretta | GT 150, V200 |
| SYM / Lance | Fiddle II/III 125, Jet 14 200, Cali Classic 125/150, Havana Classic 125/150, PCH 125/150 |
| Kymco | Agility 125, People 125/150 (carbureted models) |
| Chicago Scooter Co. | Urbano 125/150/200i, Rattler 125/200i |
| Other Brands | Ice Bear 150cc models, Adly 125/150, TGB Delivery 150, TGB Laser R9 |
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Check compatibility by measuring your current variator roller weights first. 18mm is the roller diameter, and 14mm is the roller width. Note that many variator rollers will experience slight wear over time, and the diameter will decrease.
