rebuilt carburetor set float choke been set but when cold will not start unless i spray starting fluid in it first and hold choke on and off till warmed up ??
Start at the beginning, make sure all 3 of the screens in the fuel system are clean. Remove to plug from the bottom of the carb and be sure you have a full flow through it. Also pull a plug wire to be sure you have a BRIGHT BLUE spark and not a weak yellow spark.
It really sounds like you have a weak spark problem.