Prima Roller Weight Tuning Kit (18x14): Buddy 125/150/170i

Precision Tuning: Prima 18x14mm Roller Weight Master Kit

Unlock the full potential of your CVT transmission with the Prima Roller Weight Tuning Kit. This comprehensive master set is the ultimate tool for riders looking to "dial in" their scooter's performance. Whether you want explosive off-the-line acceleration or a relaxed, fuel-efficient cruise, this kit allows you to test multiple configurations to find the perfect balance for your specific riding style and engine modifications.

Performance Advantages

• Complete Tuning Range: Includes 12 different weight sets ranging from 6g (high RPM/acceleration) to 17g (low RPM/cruising).
• Fine-Tune Capability: By "mixing" sets (e.g., three 10g and three 11g rollers), you can achieve precise increments like 10.5g to perfectly match your power band.
• Extensive Kit: Contains 36 total rollers, allowing for endless experimentation without purchasing multiple individual sets.
• High-Quality Composite: Engineered for durability during the testing phase to resist flat-spotting while you find your ideal setup.

Model Fitment: 18x14mm Rollers

This roller weight size is the industry standard for 125cc–170cc scooters utilizing the GY6 engine platform. Please use the categories below to verify your specific model.

GY6 Chinese-Manufactured Brands (125cc/150cc)

The vast majority of "generic" or Chinese-branded scooters with a 152QMI or 157QMJ engine code use 18x14mm rollers. Popular US brands include:

• TaoTao: Powermax 150, Lancer 150, Quantum 150.

• Wolf Brand Scooters: EX-150, Lucky 150.

• Ice Bear: Various 150cc models.

• Bintelli: Scorch, Beast, Havoc (150cc versions).

Verified Engine Codes

If your engine case is stamped with any of the following codes, this 18x14mm kit is compatible:

• 157QMJ, 161QMK, 152QMI, 1P61QMK
• YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A

Tech Tip: If your engine code includes "QM" or "FM" and it is a 125cc-170cc displacement, these weights will fit your variator.

Technical Specifications

• Roller Dimensions: 18mm (Diameter) x 14mm (Width)
• Weight Range: 6g, 7g, 8g, 9g, 10g, 11g, 12g, 13g, 14g, 15g, 16g, 17g
• Total Pieces: 36 Rollers (12 sets of 3)
• Manufacturer: Prima
• SKU: 1400-1070

Tech Tip: Lighter weights keep the engine in a higher RPM range for better uphill climbing and takeoff. Heavier weights lower the RPMs at cruising speeds, often increasing top-end speed and fuel economy.

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