Did you put new crankshaft seals in it and seal the split line? Did you take the carb apart again and check the gaskets. The pulse has to get up to the pump. Did you mess with the reeds? Is the fuel line wired on to the carb so it doesn’t have an air leak?
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience