Tuned Ported High Performance Motorized Bicycle 66cc

Never made a video of this with the new mods so here it is, still same motor from last video but now has 2000km on it but a new clutch, piston, rings and cylinder was installed for top performance. Sounds like a dirt bike :D this is also aka 80cc engine (really its 66cc). I have ported the cylinder ports as wide as I can and semi polished them, I also raised the exhaust port a few mm and now it has only top end power. The banana pipe (tuned pipe) is modified to be a true expansion pipe. Piston is als