Take the guesswork out of CVT tuning with the Prima Variator Roller Weight Tuning Kit. Designed for scooters using 16x13mm variator rollers, this comprehensive tuning kit lets you quickly determine the ideal roller weight for your riding style, engine modifications, and performance goals.

Whether you're chasing quicker acceleration, stronger hill-climbing power, improved fuel economy, or higher top speed, this kit gives you the flexibility to experiment with multiple weight combinations before purchasing a permanent roller set.

Unlike buying individual roller sets, the Prima Tuning Kit includes a wide range of weights organized in a durable storage case, making CVT tuning faster, easier, and more affordable.

Variator roller weights control how quickly your CVT transmission shifts.

Lighter Rollers

• Increase engine RPM
• Faster acceleration
• Stronger low-end power
• Better hill climbing
• More responsive throttle

Heavier Rollers

• Lower cruising RPM
• Smoother engagement
• Improved fuel economy
• Increased top-speed potential (if engine power allows)

Finding the correct weight keeps your engine operating in its optimal power band for maximum performance.

• Complete 36-piece roller weight tuning kit
• Wide tuning range from 3g to 14g
• Standard 16x13mm roller size
• High-quality composite construction
• Heat-resistant, low-friction material
• Smooth CVT operation during testing
• Durable divided storage case keeps weights organized
• Perfect for diagnosing CVT performance issues
• Eliminates the need to purchase multiple roller sets
• Made in Taiwan

36 Total Roller Weights

• 3 × 3g
• 3 × 4g
• 3 × 5g
• 3 × 7g
• 3 × 10g
• 3 × 14g

Mixing different weights allows for hundreds of tuning combinations to achieve your desired overall roller weight.

• Brand: Prima
• Roller Size: 16x13mm
• Weight Range: 3g–14g
• Total Pieces: 36
• Material: High-impact composite
• Storage Case Included: Yes
• Country of Manufacture: Taiwan

Fits many scooters using 16x13mm variator rollers, including:

Honda

• Ruckus (NPS50)
• Metropolitan (CHF50)
• Elite
• Dio
• Aero
• GET engine models

GY6 50cc (139QMB / 139QMA)

Compatible with many Chinese scooters including:

• TaoTao
• Wolf
• Bintelli
• Ice Bear
• Pony
• and many other 139QMB/139QMA powered scooters

Genuine

• Buddy 50
• RoughHouse 50
• Black Jack 50

Yamaha

• Zuma 50 (Horizontal/Bug-Eye)
• Vino 50 (2-Stroke)
• C3

Always verify your existing roller dimensions before ordering.

Inspect your rollers approximately every 1,000 miles or during routine CVT maintenance.

Common symptoms of worn rollers include:

• Flat spots on the rollers
• Higher RPM at cruising speeds
• Slower acceleration
• Reduced top speed
• Poor throttle response
• Lower fuel economy
• Jerky or inconsistent shifting

Replacing worn rollers restores smooth CVT operation and helps maximize engine performance.

• Install rollers in an alternating 120° pattern to maintain proper variator balance.
• Never install identical weights side-by-side.
• These rollers are intended for tuning and testing purposes only.
• Once you've determined the ideal weight, install a complete matched roller set of that weight for long-term use.

Variator Installation Tips

• Open the clutch to create slack in the drive belt before installing the variator.
• Ensure the drive face seats fully against the center boss with no visible splines.
• Reinstall the variator fan, washer, and retaining nut.
• Apply Blue Loctite to the retaining nut.
• Torque the variator nut to 30–35 ft-lbs, or follow your manufacturer's specified torque value.

Instead of guessing which roller weight works best, this kit allows you to fine-tune your scooter's CVT for your exact engine setup, rider weight, and riding conditions. Whether you're running a stock engine or a fully modified big bore build, the Prima Roller Weight Tuning Kit helps you unlock the best possible acceleration, cruising performance, and top speed before investing in a permanent roller set.