This motor doesn't need high performance upgrades to smoke nearly 2-stroke all over. With its stock low profile head, speed carb, massive bore exhaust, and 80cc crank setup, this engine receives the identical speed as sup'ed up 66cc's- if no more! AMA-degree Supercross riders have to have the pretty best https://bike-engine-kit82580.blogofchange.com/35593104/ninebot-go-kart-an-overview