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Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Tao Tao Kazuma
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Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Tao Tao Kazuma
High Quality!!
Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Tao Tao Kazuma
Item #: 19867733

Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Tao Tao Kazuma

85% of respondents would recommend this to a friend

Item #: 19867733

XCD 114

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*All items will import from US

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Order now and get it around Tuesday, September 29
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What Stands Out

Increased Displacement
Transform your GY6 scooter from 50cc to 80cc, delivering enhanced power and torque for a more thrilling riding experience, ensuring superior performance on various terrains.
High-Quality Components
Constructed with durable materials, this big bore kit ensures long-lasting performance and reliability, effectively reducing the risk of engine failure and maintenance costs for enthusiasts.
Easy Installation
Designed for a straightforward DIY installation, this kit allows users to upgrade their scooters without professional help, making it accessible for all skill levels to enhance their rides.

Product Details

Find the best deals for Big Bore Kit GY6 50cc to 80cc Scooter Moped at Ubuy Saint Lucia (Country). Upgrade your engine with this brand new kit and enjoy improved performance. Compatible with various scooter models. Shop now!
  • Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Tao Tao Kazuma
  • Brand new 4-stroke big bore kit for GY6 ATV Scooter Engine Motor 50cc to 80cc
  • Includes 1x Cylinder Block, 1x Piston, 1x Complete Ring Set, 2x Circlip, 1x Piston Pin, 2x Head Gasket Set
  • Specs: Diameter 47mm (53.2mm) Big Bore, suitable for GY6 or GY6 engine clone (139qmb) Scooters, 50cc GY6 Go Kart engine, 50cc ATVs, 50cc Dune Buggies, 50cc Buggies
  • Compatible with various models such as YERFDOG, SUNL, SYM, PGO, KYMCO, VENTO, STRADA, ROKETA, FUJI, WILDFIRE, KAZUMA

Who Should Buy?

Suitable For
  • Performance Seekers

    Users looking to enhance their scooter's power and acceleration will benefit greatly from this big bore kit.

  • DIY Mechanics

    Enthusiasts who enjoy upgrading and tinkering with their scooters will find this kit an excellent addition to their skills.

  • Scooter Commuters

    Regular riders needing extra speed and torque for daily commuting can experience improved performance with this upgrade.

Not Suitable For
  • New Riders

    Beginners may find the installation and tuning process challenging without prior experience with scooter mechanics.

Product Description

Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Tao Tao Kazuma

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is the purpose of a Big Bore Kit for a GY6 50cc engine?

    Answer: A Big Bore Kit is designed to increase the displacement of your GY6 50cc engine to 80cc, improving overall power and speed. By upgrading the cylinder and piston, this kit enhances combustion efficiency and performance. This is particularly beneficial for riders looking to experience better acceleration on hilly terrains or when carrying extra weight, offering a more dynamic riding experience.
  • Question: Is the Big Bore Kit compatible with all GY6 50cc scooters?

    Answer: The Big Bore Kit is specifically compatible with GY6 50cc scooters that utilize the 139QMB engine. However, it's essential to verify compatibility with your specific brand model, such as Tao Tao and Kazuma, before making a purchase. This ensures that the installation process goes smoothly and performs optimally for your scooter.
  • Question: Will installing a Big Bore Kit affect fuel efficiency?

    Answer: Installing a Big Bore Kit can potentially impact fuel efficiency by increasing power output, which may lead to higher fuel consumption if ridden aggressively. However, if managed correctly, many riders find an improvement in performance without significantly diminishing fuel economy. Being mindful of riding habits and recognizing how to balance performance with fuel conservation is key for maintaining efficiency.
  • Question: What other modifications should I consider alongside the Big Bore Kit?

    Answer: Alongside the Big Bore Kit, consider upgrading the carburetor, exhaust system, and CDI (Capacitor Discharge Ignition) for optimal engine performance. These modifications ensure that the new cylinder and piston can operate effectively, reducing the risk of overheating and improving overall throttle response. This collective upgrade will significantly enhance horsepower and torque, making your ride more enjoyable.
  • Question: How difficult is it to install the Big Bore Kit myself?

    Answer: Installing a Big Bore Kit requires moderate mechanical skills and tools. While some enthusiasts may handle it as a DIY project, it's advisable to seek professional installation if you are unsure about the process. Having a professional install the kit will ensure everything is correctly aligned and functioning, preventing potential damage to your scooter in the future.
  • Question: Can I use my existing parts when installing the Big Bore Kit?

    Answer: Yes, you can often use existing parts, but it’s recommended to assess their condition prior to installation. Components like gaskets, the ignition system, and fuel lines should be inspected and, if necessary, replaced for optimal performance. Ensuring that all components are in good condition will help the new kit perform effectively and prolong the life of your moped.
  • Question: Are there performance upgrades recommended for 139QMB after installing a Big Bore Kit?

    Answer: After installing a Big Bore Kit on your 139QMB engine, performance upgrades such as a high-performance exhaust, an upgraded carburetor, and enhanced air filters are recommended. These additional modifications will work synergistically with the bore kit to maximize airflow, improve acceleration, and overall handleability of your scooter. Regulating these enhancements will keep your performance balanced and efficient.
  • Question: What maintenance should be done after installing a Big Bore Kit?

    Answer: Post-installation maintenance includes regular oil changes to monitor any metal shavings or debris, checking the cylinder head bolts for proper torque, and ensuring the carburetor is properly tuned. Regular checks allow you to maintain optimal engine performance and identify potential issues early, ensuring a smooth and safe riding experience.
  • Question: Where can I buy the Big Bore Kit GY6 50cc to 80cc Scooter Moped in Saint Lucia?

    Answer: You can buy the Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB at Ubuy in Saint Lucia. Ubuy offers a wide selection of aftermarket parts and accessories suitable for your scooter, ensuring you find the exact kit you need for optimal performance.
  • Question: What should I look for when purchasing a Big Bore Kit?

    Answer: When purchasing a Big Bore Kit, ensure it's specifically designed for your GY6 50cc engine model and check customer reviews for quality insights. Look for reputable brands that provide comprehensive installation instructions and all necessary components to ensure a complete upgrade. This diligence will help you make an informed choice and avoid compatibility issues.

FixRightPro Pistons Editorial Review

This Big Bore Kit is a popular product for customers looking to increase the power and speed of their 50cc scooters. The kit fits Tao Tao 50cc scooters and other compatible models, and can be used to upgrade engine displacement to 80cc for increased acceleration and higher top end speed. Customers are cautioned to be careful with GY6 engines and not to exceed legal speed limits. The valve length is 64mm and requires a compatible 47mm cylinder head.

Customer Reviews & Ratings

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Pros

  • Increases power and speed of scooter
  • Compatible with Tao Tao and other 50cc models
  • Easy swap out and go part
  • 80cc displacement provides added push and higher speed

Cons

  • Careful use required to avoid engine damage

Platform Trust & Buyer Confidence

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4.2/5 9477 reviews
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Jasmin
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“Great products and very good service: very easy and very fast international delivery.”

9 September 2026 · via Trustpilot
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Anke
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“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”

10 September 2026 · via Trustpilot
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Hazel
Verified buyer

“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”

10 September 2026 · via Trustpilot
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Opaleye
Verified buyer

“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”

11 September 2026 · via Trustpilot
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Adele
Verified buyer

“Easy to find and order what you want on the website. Delivery is quick to the UK”

8 September 2026 · via Trustpilot
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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.

XCD 114

Order now and get it around Tuesday, September 29

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 GY6 engine to 80cc for increased power and performance
  • Includes cylinder block, piston, ring set, cirq clips, piston pin, and head gasket set
  • Compatible with various models such as YERFDOG, SUNL, SYM, PGO, KYMCO, VENTO, STRADA, ROKETA, and more
  • Diameter: 47mm (53.2mm) Big Bore
  • Ideal for GY6 50cc to 80cc Scooter, Moped, ATV 139 QMB 139QMB
  • High-quality construction and materials for reliability and durability

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