Will this big bore kit fit my GY6 150cc scooter engine?

Our big bore kits are designed to fit commonly used GY6 4-stroke engines ranging from 49cc to 250cc. For a 150cc GY6 scooter, look for kits with a bore size that matches your engine, such as 52.4mm or 57.4mm. Always double-check your engine model and size before ordering to ensure optimal fitment.

What’s included in your cylinder kits, and do I need extra parts to install them?

Our cylinder kits typically include the piston, piston rings, piston pin, gaskets, and often the cylinder head and valves for a complete top-end rebuild. Some kits also come with carburetors and spark plugs. These are plug-and-play kits, so you usually won’t need extra parts, but we recommend having basic tools and a service manual for your vehicle to guide the installation.

How much performance improvement can I expect after installing a big bore kit?

Installing a big bore kit increases your engine's displacement, which can significantly boost power and torque. For example, upgrading from 50cc to an 80cc kit can result in noticeably better acceleration and top speed. Performance gains vary depending on the kit size and your vehicle, but most riders experience smoother power delivery and enhanced engine responsiveness.

Can I install these kits myself if I have basic mechanical skills?

Yes! Most of our cylinder kits are designed for easy top-end rebuilds with plug-and-play parts. If you have basic mechanical skills and follow the included instructions or your vehicle’s service manual, you can install the kits yourself. However, if you're unsure, consulting a professional mechanic is always a safe choice to avoid damage.

Will this cylinder kit help fix issues like smoking or low compression?

Absolutely. Our kits are ideal for repairing problems such as scored cylinders, low compression, or excessive smoking commonly caused by worn-out or damaged engine parts. By replacing components like the piston and rings along with new gaskets and cylinder, you restore proper sealing and combustion, which improves engine efficiency and reduces smoke.

Collection: Kits cylindres et kits gros alésage

Kits de cylindres de grande et petite taille abordables (avec piston, segments, axe, joints, souvent culasse/soupapes) pour scooters, VTT, pit bikes, karts, pocket bikes et motos tout-terrain — augmente la cylindrée/puissance (par exemple, 50cc → 80cc, 150cc → 180cc-250cc), répare les cylindres rayés, la faible compression ou la fumée lors des révisions. Tailles dominantes : 39mm-47mm (49cc-80cc GY6 139QMB), 52.4mm (110cc-125cc TaoTao/Lifan horizontal), 57.4mm (150cc GY6 152QMI/157QMJ), 44mm (2-temps 47cc-54cc gros alésage), jusqu'à 63mm/64mm (180cc-250cc GY6) et les cas particuliers (89mm Honda XR400R, GX340/390) — kits en aluminium/acier durables pour des améliorations ou réparations économiques.

Compatibilité optimale : GY6 4 temps 49cc-250cc (139QMB/50cc court, 152QMI/157QMJ ; scooters/VTT/karts TaoTao, SunL, Roketa, Baja, SSR, Coolster, Kazuma), 2 temps 43cc-50cc (Jog/Zuma/Vino, pocket bikes/mini quads, tronçonneuses), moteurs horizontaux 110cc-125cc (Lifan LF125, TaoTao/Coolster), pit bikes YX140 140cc-150cc, Honda CRF70/XR70/CT70/TRX70 + GX340/GX390, et de nombreux clones chinois. La plupart sont des kits de haut moteur complets prêts à l'emploi (certains avec carburateur/bougie/culasse/soupapes) pour une augmentation rapide de la cylindrée ou des révisions complètes !

Besoin uniquement de la culasse ? Parcourez notre collection de culasses.