Fixing Shifter Kart Exhaust and Tuning Carb

My CR125 shifter kart didn't want to start or run this year. I just bought it last fall from a different state and assumed the elevation change was the reason. While tinkering, I realized my exhaust was cracked. In this video, I repair the exhaust and change the jets. BTW, I'm a complete noob to karts and 2 stroke engines...