Stage6

CVT Pulley Naraku High Speed CNC GY6 139QMA / 139QMB

SKU: NK900.59
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CVT Pulley Naraku High Speed CNC GY6 139QMA / 139QMB

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Newest version (V.2) of the CNC-milled drive pulley from NARAKU. This revised version now allows for mounting the original variator fan pulley and the original star washer. The surface angle has been revised again, which offers slightly higher top speed coupled with sufficient engine power. The CNC-manufactured surface makes for smooth, low-vibration drive belt operation. Different from CNC-milled pulleys for other engine types, this one is toothed so that the electric start can be kept, which saves you the tedious kick starting. On the other hand, this makes the product slightly more expensive to manufacture. Original fan wheel and kickstart pinion can be used, but are not included in the delivery.

  • Brand: Naraku
  • SKU: NK900.59
  • Availability: Currently not in stock

Notes and Safety CVT PulleysPulleys are an integral part of the CVT system on scooters and mopeds with automatic CVT transmission. The continuously variable transmission consists of fixed and moving pulleys, the V-belt rises and falls between them depending on the engine speed, changing the speed of the vehicle.When should you change a pulley?There are two reasons for replacing pulleys:Wear and tear. Although pulleys are relatively durable, the constant sliding of the V-belt can deform the surface.Tuning. Different pulley angles and diameters can improve the handling of scooters or mopeds.Note: A CVT variator can only do a good job when CVT pulleys as well as torque drive pulleys are compati

Technical Specifications

SKU NK900.59
Warranty 12 months

Performance Features

CNC Machined

Precision-engineered components for perfect fitment and maximum performance.

Lightweight Design

Optimized weight reduction for improved acceleration and handling.

Racing Performance

Track-proven design delivering consistent power and reliability.

Increased Reliability

Premium materials ensure long-lasting durability under extreme conditions.

High RPM Stability

Engineered to maintain balance and performance at maximum RPM.

Improved Cooling

Advanced thermal management for consistent performance.

Fitment & Compatibility

Brand Model Engine Years
Piaggio Vespa S 2-Stroke 2008-2020
Piaggio Vespa LX 2-Stroke 2005-2015

Technical Data

Shipping & Delivery

🇵🇱
Poland
DPD 1–3 Days
🇪🇺
Europe
DPD 2–11 Days
🌍
Worldwide
DHL Express 2–8 Days

Installation Information

⚠️ Important

Professional installation recommended. Improper installation may void warranty and cause engine damage.

💡 Pro Tip

Always use proper torque specifications and break-in procedures for optimal performance and longevity.

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Frequently Asked Questions

Check the compatibility table above. If your model is listed, this part will fit. Contact us if you're unsure.
We recommend professional installation by a qualified mechanic. Proper tools and technical knowledge are required.
Yes! We ship to over 50 countries worldwide with DHL Express and DPD. Delivery times vary by location.
All parts come with manufacturer warranty. Check the specifications section for warranty details.