This motor doesn't require high performance upgrades to smoke nearly two-stroke all around. With its stock very low profile head, speed carb, massive bore exhaust, and 80cc crank set up, this engine gets a similar speed as sup'ed up 66cc's- if no more! The build top quality is very good https://bikeenginecomparison94824.blog-eye.com/35179802/the-ultimate-guide-to-go-karts-plus-williamsburg-va