Habit of sticking on in later years , thus running rich .This dilutes oil eventually on the cylinder bores washes it off , leads tobore scoring .Not what you really want .
A lot of Webber guys ( inc carb ,d Ferrari s disconnect chokes .Alternately rebuild them and fit new bushes etc so the do not stick .
Lack of use likely in a boat means the fuel evaporates and leaves a sticky gum and you are back to sq 1 .
Wait 20;secs for the fuel pump to fill the float chambers two depresses of the peddle , or in a boat throttle to mimic choke and fire up in the usual way without fear or risk of running rich .
Hope this helps ?