Review on 🚀 Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm: Boost Your 139QMB ATV Scooter Moped Go Kart! by Eddie Man

Great set of barrels. Not too difficult to install, but make sure you do your planning and research. There are some great installation videos on YouTube. Take your time and open the rings properly. Make sure the valve clearance is correct! You need to raise your main jet in your carburetor. Using a stock main jet will ruin your scooter engine. Regardless of how you plan to break in, change the oil after installation and after about 10 hours, and then again after 10 hours. Torque the cap screws to 13-14 ft-lbs, aka 19 Nm. I got 40 mph if now with no modification other than a cone air filter. I use the 33rd pilot and the 94th main jet. Put the second needle from the top (a little bold). You can reuse the stock 33mm valve head, but I recommend a larger 47mm valve head to keep pressure and CHT down. You will shorten the life of your grip, but that's to be expected. Do your homework.