--- product_id: 72134848 title: "80cc Big Bore 47mm Cylinder Rebuild Kit for GY6 49cc 50cc ATV Scooter Moped with 139QMA 139QMB Engine" brand: "chanoc" price: "297.53 DT" currency: TND in_stock: true reviews_count: 8 category: "Chanoc" url: https://www.desertcart.tn/products/72134848-80cc-big-bore-47mm-cylinder-rebuild-kit-for-gy6-49cc store_origin: TN region: Tunisia --- # 47mm cylinder bore diameter Fits 139QMA/139QMB engines 80cc big bore upgrade 80cc Big Bore 47mm Cylinder Rebuild Kit for GY6 49cc 50cc ATV Scooter Moped with 139QMA 139QMB Engine **Brand:** chanoc **Price:** 297.53 DT **Availability:** ✅ In Stock ## Summary > ⚡ Upgrade your ride, dominate every hill! ## Quick Answers - **What is this?** 80cc Big Bore 47mm Cylinder Rebuild Kit for GY6 49cc 50cc ATV Scooter Moped with 139QMA 139QMB Engine by chanoc - **How much does it cost?** 297.53 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/72134848-80cc-big-bore-47mm-cylinder-rebuild-kit-for-gy6-49cc) ## Best For - chanoc enthusiasts ## Why This Product - Trusted chanoc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Fit:** Engineered with a 47mm cylinder bore and 13mm piston pin for seamless compatibility and durability. - • **Hill-Climbing Hero:** Experience effortless ascents with enhanced torque and power delivery on any terrain. - • **Power Boost Upgrade:** Transform your 50cc engine into a robust 80cc powerhouse for unmatched performance. - • **Complete Rebuild Kit:** Includes intake & exhaust studs plus exhaust nuts—everything you need to upgrade with confidence. - • **Universal Compatibility:** Perfectly designed for popular GY6 139QMA and 139QMB engines found in top Chinese scooters and ATVs. ## Overview This 80cc Big Bore 47mm Cylinder Rebuild Kit is a precision-engineered upgrade for 4-stroke GY6 50cc engines (139QMA/139QMB). It boosts engine displacement from 50cc to 80cc, delivering more power and improved hill-climbing ability. Compatible with a wide range of Chinese import scooters and ATVs, this kit includes essential hardware for a smooth installation and reliable performance. ## Description Compatible with Most Chinese import ATV scooter moped which equipped with 139qma and 139qmb engine.Such as Taotao Sunl BMS Roketa Kazuma Baotian Jonway etc Review: Easy to install. Works great - When I buy and sells 49cc scooters, I install BBK such as this one. I have no complaints from anybody. Review: Order a cam chain tensioner gasket! - This kit fit my little Chinese scooter very well, slid together with just the right amount of resistance, and looks completely stock from the outside. There are no instructions with the kit, only parts, but it does include intake and exhaust studs and exhaust nuts (not needed for install, but good to have for spares!). I got 3/4 through reassembly and discovered that the kit doesn’t include a cam chain tensioner gasket, so be sure to order one (about $1) or go to the local scooter shop like I did ($5!). I don’t know how it runs yet, I’m on my way home with the gasket, but I’ll update once I’m riding again! ## Features - Big bore kit Compatible with 4 stroke GY6 50 139qma and 139qmb engine - Your vehicle will get more power with this item,easier to climb hill than ever before - Inner Diameter of Cylinder bore: 47mm,Outer Diameter of Piston Pin: 13mm - Upgrade your engine from 50cc to 80cc ## Images ![80cc Big Bore 47mm Cylinder Rebuild Kit for GY6 49cc 50cc ATV Scooter Moped with 139QMA 139QMB Engine - Image 1](https://m.media-amazon.com/images/I/71sgB+HkL9L.jpg) ![80cc Big Bore 47mm Cylinder Rebuild Kit for GY6 49cc 50cc ATV Scooter Moped with 139QMA 139QMB Engine - Image 2](https://m.media-amazon.com/images/I/71cq1VaFwOL.jpg) ![80cc Big Bore 47mm Cylinder Rebuild Kit for GY6 49cc 50cc ATV Scooter Moped with 139QMA 139QMB Engine - Image 3](https://m.media-amazon.com/images/I/71fyuTNK3PL.jpg) ![80cc Big Bore 47mm Cylinder Rebuild Kit for GY6 49cc 50cc ATV Scooter Moped with 139QMA 139QMB Engine - Image 4](https://m.media-amazon.com/images/I/615jG+VgSPL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easy to install. Works great *by S***Y on January 11, 2026* When I buy and sells 49cc scooters, I install BBK such as this one. I have no complaints from anybody. ### ⭐⭐⭐⭐ Order a cam chain tensioner gasket! *by A***R on June 23, 2018* This kit fit my little Chinese scooter very well, slid together with just the right amount of resistance, and looks completely stock from the outside. There are no instructions with the kit, only parts, but it does include intake and exhaust studs and exhaust nuts (not needed for install, but good to have for spares!). I got 3/4 through reassembly and discovered that the kit doesn’t include a cam chain tensioner gasket, so be sure to order one (about $1) or go to the local scooter shop like I did ($5!). I don’t know how it runs yet, I’m on my way home with the gasket, but I’ll update once I’m riding again! ### ⭐⭐⭐⭐⭐ best kit of all *by Ꮳ***Ꮝ on April 7, 2019* Out of other BBK kit's i have installed this one on 2 mopeds it is the best in quality casting,fitment and gaskets.The stud bolts for intake and exhaust that comes with this kit if using your original head remove the old studs and replace with the studs that come with this kit i use a drop of mid grade blue lock tight on all my scooter bolts retightening all bolts and nuts during break in exhaust bolts especially.Install a new NGK spark plug while you have head off making sure it is tight.Best valve gap is .004 intake and exhaust.A ring compressor is not needed if rings are installed correctly the rings will compress going into jug using your fingers to compress the first 2 rings"I use axle or marine grease on the new jug and piston lightly to prevent first starts being metal to metal.To have the best results install new exhaust,intake gaskets and a new intake manifold.Installing a #90 main jet with throttle needle clip set 2nd down from top. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/72134848-80cc-big-bore-47mm-cylinder-rebuild-kit-for-gy6-49cc](https://www.desertcart.tn/products/72134848-80cc-big-bore-47mm-cylinder-rebuild-kit-for-gy6-49cc) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-18*