Review on Trkimal 100cc Big Bore Kit for 64mm Valve - 139QMB Moped Scooter Engine - 50mm Bore Upgrade Set with GY6 Cylinder Rebuild Kits, 6pin Racing CDI Ignition Coil, Performance Spark Plug, and Clutch Spring by Jason Vigil

I installed it, everything went fine, it took 4 hours to complete the installation, it started right away, it worked for about 5 minutes, now it's gone Beginning. I think these are defective rings, possibly a large bore cylinder. I heard they have a great client so I will contact them. They replied the same day and sent me a new set of cylinders and pistons to install after the rain. Amazing customer service! I hope it works after I put it back together. Put it back together and it will work great. Much faster, had to increase carburetor power, exhaust power, cold air intake but it does exactly what I wanted.