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Description
Naraku 139QMB / GY6 50cc Super Transmission Kit w/ Clutch, Belt, Variator KitNaraku 139QMB GY6 50cc Super Transmission Kit w Clutch, Belt, Variator Kit Restore lost top speed, eliminate off the line bogging, and completely refresh your drivetrain with the Naraku Super Transmission Kit. Engineered specifically for 50cc and 49cc GY6 50 139QMB 4 stroke engines, this all in one CVT tuning package replaces your entire worn factory transmission setup. By matching a high performance variator, precision balanced clutch assembly, heavy
Naraku 139QMB / GY6 50cc Super Transmission Kit w/ Clutch, Belt, Variator Kit
Restore lost top speed, eliminate off-the-line bogging, and completely refresh your drivetrain with the Naraku Super Transmission Kit. Engineered specifically for 50cc and 49cc GY6 50 / 139QMB 4-stroke engines, this all-in-one CVT tuning package replaces your entire worn factory transmission setup. By matching a high-performance variator, precision-balanced clutch assembly, heavy-duty clutch bell, and a calibrated drive belt, Naraku delivers seamless linear shifting, crisp throttle response, and maximum power transfer to the rear wheel.
What's Included in the Box
- Performance Variator & Drive Face: Optimized roller ramp angles maximize belt travel for improved acceleration and high-end speed. Includes a 26-spline drive face.
- Pre-Assembled Clutch & Torque Spring Base: Features durable, high-friction clutch shoes and an anti-slip torque spring base to ensure positive engagement under load.
- Heavy-Duty Clutch Bell: Precision-vented steel clutch drum designed for rapid heat dissipation, preventing thermal glazing and clutch chatter.
- Premium V-Belt: High-tensile drive belt selected for optimal dimensional stability and minimal stretching under high thermal strain.
GY6 50cc engines come in three distinct case lengths. Use the drop-down menu to select the correct kit configuration for your scooter platform:
| Belt Option | Engine Case Profile | Common Vehicle Applications & Notes |
|---|---|---|
| 669mm Kit | Short Case (10" Rear Wheel) | Fits standard short-case GY6 50cc scooters running small 10-inch rear wheels (e.g., ATM50-A1, VIP, and classic city scooters). |
| 729mm Kit | Long Case (12" or 13" Rear Wheel) | Fits standard long-case GY6 50cc scooters running larger 12 or 13-inch wheels. Always verify your case measurement matches a long configuration. |
| 788mm Kit | Extra-Long Case (Fat-Tire / Custom) | Engineered for extended-case variants, most notably found on the Icebear Maddog 50cc and similar Honda Ruckus clone platforms. |
Technical Specifications
- Engine Compatibility: GY6 50cc / 49cc 139QMB / QMB139 4-Stroke
- Roller Weight Size: 16mm x 13mm (6g weights included)
- Variator Outer Diameter: 88mm
- Drive Face: 26 Splines | 13mm Inner Diameter | 113.7mm Outer Diameter
- Clutch Drum: 22 Splines | 11.10mm Inner Diameter
- Sliding Torque Spring Base: 118mm Outer Diameter
- Manufacturer: Naraku (Germany)
Tuning Note: The included 6g roller weights provide an excellent balanced starting point for stock or lightly modified 50cc engines. If you have an 80cc Big Bore Kit installed, experiment with heavier or lighter weights to match your modified torque curve.
Installation Tip: Clean the crankshaft splines carefully before installing new components. Never use an impact gun to tighten the variator or clutch nuts without a holding tool — improper torque can strip crank threads or crush components.
Questions about parts & compatibility? Visit the contact page. - HB SCOOTERS PARTS - Professional Scooter Dealership in Southern California Since 2008
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 5
Very gentle for the face
Size: 300 Count
I use this brand for the last couple of years and its really good, soft.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 5
Say goodbye to pesky bites!
Size: 1 Count (Pack of 12)
I recently tried the Mosquito Bracelets, and they have become a must-have for any outdoor adventure. Here’s why I highly recommend these DEET-free, natural, and waterproof bands:
These bracelets are impressively effective at keeping mosquitoes at bay. Whether I’m hiking, camping, or just relaxing in my backyard, I’ve noticed a significant reduction in mosquito bites. The natural ingredients used in these bracelets provide a strong and pleasant scent that mosquitoes seem to hate, making them a reliable option for outdoor protection.
One of the standout features is that these bracelets are DEET-free, making them safe for everyone, including children and those with sensitive skin. They are made with natural ingredients, which gives me peace of mind knowing that I’m not exposing myself or my family to harsh chemicals.
The waterproof feature is a game-changer. I can wear these bracelets while swimming, sweating, or during rainy weather without losing their effectiveness. This durability ensures that I stay protected in various conditions, making them perfect for summer activities and trips to the beach or pool.
Each bracelet is individually wrapped, which is incredibly convenient. I can easily toss a few in my bag, car, or camping gear without worrying about them losing potency. The individual packaging also makes them perfect for sharing with friends and family during outings.
The bracelets are soft, flexible, and comfortable to wear. They are adjustable to fit any wrist size, which is great for both adults and kids. I’ve worn them for hours without any discomfort, and they don’t irritate my skin.
I was pleasantly surprised by the longevity of these bracelets. Each band provides up to 72 hours of protection, which is fantastic for extended outdoor activities. This long-lasting feature means fewer replacements and more continuous protection.
Considering the effectiveness, natural ingredients, and convenience, these mosquito bracelets offer excellent value for money. The 12-pack ensures I have enough to last through multiple outdoor adventures or to share with others.
In summary, the Mosquito Bracelets are a fantastic solution for anyone looking to stay protected from mosquito bites naturally and comfortably. Their effective repellent properties, DEET-free composition, waterproof design, convenience, comfort, long-lasting protection, and great value make them a top choice. I highly recommend these bracelets for their overall quality and performance.
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Reviewed in the United States on November 26, 2024
★★★★★ 5
Highly recommend
Size: 1 Count (Pack of 1)
Worked great mosquitoes leave me alone
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Reviewed in the United States on May 25, 2026
★★★★★ 4
Worth a try
Size: 1 Count (Pack of 12)
Not perfect protection, but fewer mosquitos in the past two weeks. I use them in my study where I'm most likely to sit still -- one down low on my desk chair (reduces ankle bites), one on a door knob, one on a corner of my desk. I don't wear them often because I find them uncomfortable. Can't report yet how long they last. Odor is not overwhelming or unpleasant.
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Reviewed in the United States on September 30, 2025
★★★★★ 5
Great product
Size: 1 Count (Pack of 12)
We hse these every time we’re in Jamaica. Works even after being in the water
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Reviewed in the United States on May 24, 2026
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