4 hp Johnson 71 adjust carburator

[Matrix_2003]

I would like to know the standard adjustment of the carburetor the number of turn of each screw

[Xcusme]

Matrix,Welcome to the forum.Carburetor Adjustments - Two Adjustable N/Vs)Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slowspeed = seat gently, then open 1-1/2 turns.Setting the high and low needle valves properly:NOTE: For engines that DO NOT have a shift selection, obviously there is noNEUTRAL position. Simply lower the rpms to the lowest setting to obtain the lowspeed needle valve adjustment.(High Speed) Start engine (it will run pretty rough), shift into forward gear, take up tofull throttle. In segments of 1/8 turn, waiting for the engine to respond between turns,start turning in the bottom high speed needle valve. You'll reach a point whereas theengine will either start to die out or spit back (sounds like a mild backfire). At thatpoint, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find thesmoothest setting.(Low Speed) Slow the engine down to where it just stays running. Shift into neutral.Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a fewseconds for the engine to respond. As you turn the valve in, the rpms will increase.Lower the rpms again to where the engine will just stay running. Eventually you'll hitthe point where the engine wants to die out or it will spit back. Again, at that point,back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speedsetting.When you have finished the above adjustments, you will have no reason to movethem again unless the carburetor fouls/gums up from sitting, in which case youwould be required to remove, clean, and rebuild the carburetor anyway.