Naraku Performance Torque Spring Base: QMB139/Piaggio

Eliminate Spring Bind: Naraku Ball-Bearing Torque Spring Base

Optimize your CVT's shifting consistency with the Naraku Performance Torque Spring Base. This precision-engineered upgrade replaces the static factory spring seat with a high-performance ball-bearing assembly. By allowing the torque spring to pivot and twist freely as it compresses, this base eliminates "spring bind," resulting in smoother downshifting and more predictable acceleration out of corners.

Technical Performance Features

• Anti-Binding Ball Bearing System: Utilizes a captured bearing race that allows the spring to rotate independently of the pulley, reducing friction and internal stress.
• Improved Shift Response: By removing mechanical resistance, the rear pulley can react faster to throttle changes, keeping your engine in its optimal powerband.
• Universal 50cc Fitment: Specifically designed for the 139QMB engine platform and Piaggio/Gilera 50cc 2-stroke and 4-stroke transmissions.
• Low-Profile Design: At only 30mm in height, this base integrates seamlessly with both stock and performance torque springs without requiring modifications to the clutch bell.

Comprehensive Fitment Guide

This Naraku base (NK900.44) is compatible with a wide range of 50cc and 80cc scooters, including:

Technical Specifications

• SKU: 137-80
• Manufacturer MPN: NK900.44
• Overall Height: 30mm
• Includes: Spring base, ball bearings, and hardened bearing race
• Requirement: Must be used with High-Temp Bearing Grease

Pro-Tuning Note: This kit does not include a torque spring. For the ultimate performance setup, we recommend pairing this base with a Naraku or NCY 1000-1500 RPM Performance Spring to match your rider weight and terrain.

Note: Professional installation is recommended. High-temp grease is required for the bearing assembly to ensure longevity.

About Naraku: NARAKU is a professional supplier of motorcycle parts from Taiwan. We’ve sold various motorcycle parts, scooter parts and accessories for more than 10 years. Our quality products are sold to Europe, Asia and America. We supply engine parts and accessories for modern scooters and mopeds. With our advanced technologies and the superb quality of our products, we can offer everything your ride needs.

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