It’s a blast riding around works great
The Stage 4 Kit, particularly the BBR Tuning Billet Aluminium High Performance Cylinder Head 66/80cc upgrade adds quite a bit more power, and keeps the temp down. It's well machined, came with an upgraded spark plug and has lived up to advertised specs! Customer service, shipping turn times and quality have all been top notch! I'll never order a China clone off competitors site again.
Had to fab washers, so that the head wouldn't leak
Have not compared it with the stock head but it stays cool and can get almost 40 mph so the performance is there
The cylinder heads looks awesome but haven’t had any time to work on this motor to give you any feedback at this time.