Pay in installments of $35.00 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Sep 4 - Sep 9
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
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
4.7 ★★★★★
Based on 15 reviews
Sort
Product Reviews
★★★★★ 5
Good purchase
Format: Hardcover
Good purchase
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 18, 2024
★★★★★ 4
Decent if not a little shallow overview but full of typos
Format: Hardcover
Purchased thos book to consider passing to an employee eyeing a promotion. The information is ok to get the broad level concepts across for someone who has no thought about these concepts at all.
However. Man. This book is riddled with more typos than my 2am half drunk reddit posts. Words that are missing spaces between them, phrases that change tense or intent of where the sentence was going to go ... It's pretty drole reading in general and the distractions do not help!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 28, 2024
★★★★★ 5
Great book
Format: Paperback
Very great book. Came quicker than expected. Very great condition!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 20, 2023
★★★★★ 5
One of the best Project Management Books I've Read!
Format: Kindle
This was a really great read for many reasons. The focus on ensuring your project has a strategic purpose is so important these days, where Program and Project Managers need to make sure the projects they are leading are providing value to the organization. The framework is one that can be applied immediately with the explanation and tools provided in the book and on the author's website. The real-life stories and projects were not only fun to read, but very helpful in understanding how to apply the framework. The examples were very thorough and helpful. There is great information on what is needed from a PM to be successful including managing the team and stakeholders.
On top of all that, when I got to Chapter 10 it was like a bonus chapter for me. Chapter 10's focus is on "managing your inner game", and has great information on ensuring you have the right mindset to be successful. Project Managers have the opportunity (and challenge) to work with many different personalities and in many challenging environments. This chapter provides really great information on how to navigate those waters and be successful. Chapter 10 could seriously be a book in itself.
Chapter 12 was yet another bonus chapter, especially for lifelong learners. It's all about the idea of taking everything we've learned and applying it to our life. As the author states, our lives are essentially a project. Why not apply the same principles to ensure we are achieving our purpose and providing value, with yet again, really great examples to get us started.
Anyone who leads or is involved in any kind of projects or who wants to work better in a team environment would benefit from reading this book.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2021
★★★★★ 5
Strategic Management Made Simple and Effective
Format: Hardcover
I told Terry Schmidt that would be a better title for his book, “Strategic Management Made Simple and Effective”.
The time-tested Logical Framework Approach (LFA) that Terry champions goes far beyond project management. With its exploratory LogFrame matrix leading from inputs to outcomes, outcomes to purpose, and purpose to goal, the LFA forces you to understand the reason for the project. Projects are not executed for their own reason but to achieve something specific. The LogFrame traverses the ladder from inputs to goal through objectives with success measures, ways to verify success, and assumptions that must hold true be successful.
Terry adds his own concept -- that he calls the Implementation Equation™ -- to help you build the LogFrame: IF inputs AND valid assumptions, THEN outcomes / IF outcomes AND valid assumptions, THEN purpose / IF purpose AND valid assumptions, THEN goal.
This methodology offers you a way to view the LogFrame with multiple perspectives: scientific method, strategic planning, project management, risk management, management by objectives, and, although he does not mention it, also quality management.
In particular, his use of assumptions has helped me to redefine my view of risk management. Rather than brainstorm a large list of possible risks in a registry that becomes impossible to manage, I use the probability that the assumptions needed for success are not valid – and their impact on achieving success, as the true risks that must be actively managed.
A highly entertaining as well as informative book, “Strategic Project Management Made Simple”, or whatever you choose to call it, should be the first guide you reach for when building a portfolio, creating programs or products, or starting a project.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 5, 2021
recommand products
Rec LED Cobalt 4" Click2 Retrofit LED Retrofit in Black
72.99
Rec LED Cobalt 4" Click2 Retrofit Retrofit in Matte Powder White
81.81
Rec LED Cobalt 6" Hl Trim Recessed in Haze / White
88.83
Rec LED Cobalt 4" Click2 Retrofit Reflector in Bronze
75.96
Rec LED Cobalt 6" Hl Trim Recessed in Matte Powder White
85.05