Maoyubelt
0 ratings
47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
genuine image
47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
Change the size of your engine, and feel the POWER.
47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
Item #: 93995394

47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings

Item #: 93995394

SHP 99

Price Details

Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )

*All items will import from US

0 ratings Write a review
In stock
us Imported from USA store

QTY:

Order now and get it around Friday, September 04
Secured transactionsecured transaction

Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.

Our Top Logistics Partners
  • fedex
  • dhl
Change the size of your engine, and feel the POWER.
U-Care Warranty:
None
Select a Plan
fast shipping

Fast
Shipping

free return

Free
Return*

secure packaging

Secure Packaging

100% original products

100% Original Products

pci-dss

PCI DSS Compliance

iso certified

ISO 27001 Certified

paypal payment
visa payment
mastercard payment
Note: Step 1 Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.

What Stands Out

Enhanced Engine Performance
Transforms a 50cc scooter into an 80cc powerhouse, significantly boosting acceleration and top speed for an exhilarating ride.
Complete Kit Convenience
Includes everything needed for installation, saving time and effort; ideal for DIY enthusiasts looking to upgrade their scooter.
High-Quality Components
Manufactured with durable materials, ensuring long-lasting reliability and optimal performance in various riding conditions.

Product Details

Shop 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings online at a best price in Saint Helena. B0D3M1891Y
Package Weight2.6 Pound

Who Should Buy?

Suitable For
  • Performance Enthusiasts

    Ideal for users looking to enhance the speed and power of their scooters or mopeds significantly.

  • DIY Mechanics

    Great for individuals skilled in small engine repairs who want to modify their scooters personally.

  • Upgraders

    Perfect for users wanting to upgrade their GY6 50cc engine to increase displacement and overall performance.

Not Suitable For
  • Casual Riders

    Not suitable for users who casually ride without seeking performance upgrades or modifications.

Product Description

47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is a 47mm Big Bore Kit for GY6 50cc to 80cc scooters?

    Answer: A 47mm Big Bore Kit is a performance upgrade designed for GY6 50cc to 80cc scooters, specifically compatible with the 139QMB engine. It includes a larger cylinder and piston which increases the engine's displacement, allowing for improved power and torque. This kit enhances the overall performance, making your scooter faster and more responsive, ideal for riders looking for better acceleration or hill-climbing capabilities.
  • Question: How does installing a 47mm Big Bore Kit affect my scooter's performance?

    Answer: Installing a 47mm Big Bore Kit significantly enhances your scooter's performance by increasing engine displacement. This results in higher power output and improved acceleration, making it suitable for both daily commuting and leisure rides. Riders may experience better handling and responsiveness during rides, especially in varied terrains, contributing to an overall improved riding experience.
  • Question: Is a 47mm Big Bore Kit compatible with all GY6 scooters?

    Answer: While the 47mm Big Bore Kit is specifically designed for GY6 50cc to 80cc scooters, compatibility may vary based on the model and its specific engine configuration. It's essential to check if your scooter uses the 139QMB engine before installation. Ensuring compatibility helps in achieving optimal performance and avoids potential operational issues post-installation.
  • Question: What tools are needed to install a 47mm Big Bore Kit?

    Answer: To install a 47mm Big Bore Kit, you'll typically need a set of basic hand tools including wrenches, screwdrivers, and a torque wrench. Additional tools like a gasket scraper and a ring compressor may also be helpful for a smooth installation process. Familiarity with the engine assembly is beneficial, and proper tools ensure a secure fit and functioning of the new components.
  • Question: Will a 47mm Big Bore Kit require any tuning of my scooter?

    Answer: Yes, after installing a 47mm Big Bore Kit, tuning of your scooter may be necessary to ensure optimal performance. This could involve adjusting the carburetor settings, replacing the air filter, or modifying the exhaust system. Proper tuning helps in achieving better fuel efficiency and enhanced power delivery, ensuring that your scooter runs smoothly without any issues.
  • Question: Can I install the 47mm Big Bore Kit myself, or should I seek professional help?

    Answer: If you have mechanical experience or knowledge of scooter maintenance, you may be able to install the 47mm Big Bore Kit yourself. However, for those unfamiliar with engine components, seeking professional help is advisable. Proper installation is crucial to avoid damage to the engine and to ensure that the performance enhancements are realized safely and effectively.
  • Question: What are the benefits of using this Big Bore Kit over a stock engine?

    Answer: Using a 47mm Big Bore Kit offers significant advantages over a stock engine, including increased horsepower, better acceleration, and enhanced torque. Riders often report an exhilarating improvement in performance, which is particularly beneficial for tackling steep hills or achieving faster top speeds. Additionally, enthusiasts appreciate the thrill of customization and the enhanced driving experience that comes with upgraded components.
  • Question: Do I need to make any modifications to my scooter's frame to install the kit?

    Answer: In most cases, installing a 47mm Big Bore Kit does not require modifications to the scooter's frame. However, it’s essential to ensure that the new cylinder fits correctly without obstruction. Checking for clearance around the engine and other components can prevent complications. Depending on other upgrades you plan to make, additional modifications might be necessary for optimal performance.
  • Question: What kind of maintenance should I perform after installing the Big Bore Kit?

    Answer: After installing the 47mm Big Bore Kit, it is important to keep up with regular maintenance to ensure longevity and performance. This includes periodic oil changes, checking and adjusting the carburetor, and inspecting spark plugs for optimal firing. Keeping the engine clean and addressing any performance issues promptly will help maintain your scooter’s performance and reliability after the upgrade.
  • Question: Where can I buy a 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings?

    Answer: You can buy the 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings on Ubuy. Ubuy offers a wide selection of high-quality products, ensuring you'll find the right kit for your needs. Their platform provides a user-friendly experience and reliable service, making it easy to get the parts you need to enhance your scooter's performance.

Maoyubelt Rebuild Kits Editorial Review

No editorial reviews found

Customer Reviews & Ratings

1 customers ratings
  • 5 Star
    100%
  • 4 Star
    0%
  • 3 Star
    0%
  • 2 Star
    0%
  • 1 Star
    0%

Review this product

Share your thoughts with other customers

Pros

  • Increases scooter power significantly
  • Easy to install
  • High-quality materials used
  • Improves overall performance
  • Compatible with many models

Cons

  • May require minor adjustments.

Platform Trust & Buyer Confidence

trustpilot logo
4.2/5 9250 + reviews
Read reviews
MA
Mohammad
Verified buyer

“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”

23 July 2026 · via Trustpilot
CK
Chitra
Verified buyer

“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”

22-Jul-26 · via Trustpilot
K
kund
Verified buyer

“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”

23-Jul-26 · via Trustpilot
OO
Onesi
Verified buyer

“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”

22 July 2026 · via Trustpilot
SJ
SAO JOHN
Verified buyer

“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”

23 July 2026 · via Trustpilot
Secure Checkout Global Delivery Easy Returns Genuine Products

Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
  • Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

SHP 99

Order now and get it around Friday, September 04

QTY:

Secured transactionsecured transaction

PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.

Our Top Logistics Partners
  • fedex
  • dhl
Fastest cross-border delivery

Features & Benefits

  • Upgrade your scooter or moped with the Maoyubelt 47mm Big Bore Kit.
  • Increases your engine size from 50cc to 80cc for enhanced performance.
  • Includes all necessary components: cylinder block, piston, rings, and seals.
  • Experience greater power and torque for a more thrilling ride.
  • Compatible with various models and popular engine clones.
  • Transform your 50cc engine into a powerhouse with ease.

Ubuy Assurance

Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.