On mind, almost 50 years old now, when cold, and to squeeze the throttle push a button that held the carb valve opened a bit, also had to pull out the choke knob out. When hot, do nothing, just pull on the starter cord.
Is a two cycle engine had to constantly clean the sparkplug. adding an ounce of Seafoam to a gallon of ethanol free gas helped a little in keeping it cleaner.
Old ones have two needle valves for run and idle, EPA outlawed these things, just the slightest amount of film on the jets, won't start and will wear your arm out, ethanol causes that film.