Re: 40 hp johnson 1976 carb.
There is no high speed needle on a 1976 40hp. There is a non-adjustable fixed jet (orifice plug) behind the slotted hex screw in the bottom of the carburetor. Yes. it requires a special screwdriver to get it out. You probably will bugger it up if you try removing it with makeshift tools. You can buy the tool from an Evinrude dealer.