Brian,
The carb float may have a hole, the float may be stuck due to being gummed up, or a bit of dirt could have prevented the float to close fully.
As a rule, every Cub I buy now gets a good carb cleaning\rebuilt if needed. And to make sure that my carb work isn't for nothing, I thoroughly clean the gas tank, replace all the fuel lines with an inline filter. Too many times somebody will take the time to clean and rebuild a carb, then neglect the tank and fuel lines, then get really upset when the problems that they fixed re-occur. Fuel line and an in-line filter are cheap compared to the time spent tearing down and re-cleaning a carb.
The carb float may have a hole, the float may be stuck due to being gummed up, or a bit of dirt could have prevented the float to close fully.
As a rule, every Cub I buy now gets a good carb cleaning\rebuilt if needed. And to make sure that my carb work isn't for nothing, I thoroughly clean the gas tank, replace all the fuel lines with an inline filter. Too many times somebody will take the time to clean and rebuild a carb, then neglect the tank and fuel lines, then get really upset when the problems that they fixed re-occur. Fuel line and an in-line filter are cheap compared to the time spent tearing down and re-cleaning a carb.