Re: 84 johnson
ok, from your PM, "i forget to mention i rebuilt the carb,fuelpump,addedfresh gas and oil mixture engine still does the samething when choke is pushed in it acclerates and cuts off it is an 1984 25 hp.'
it sounds like it is starving for fuel. did you follow the directions in the above link? did you remove the drain screw on the bowl, and then the high speed jet, and clean them, it has to be spotless, also the tube that goes up the center of the carb, has to be clear. i spray carb cleaner thru it.
also did you set the low speed needle according to this.
(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)
Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.
Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds 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 hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.
Note: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.
When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
are you positive you have spark on both plugs, have you check the spark, immediately after the motor dies.
