1984-1986 Mercury Force 4HP Outboards Service Manual, Page 14Get this manual
idle tube it creates low pressure area that lifts the fuel Irom the fuel bowl, through the main jet (high pressure are.a) The rich mixture (high fuel contentlow air content) is now available to the engine
It is most likely the engine will have to be run lor lew moments with the choke in operation until the engine warms up