Re: 57Johnson 18hp seaking starting problem help
Hi Madera,<br /> Your motor uses a pressure feed fuel system. As such, the fuel tank builds up pressure to force fuel into the carburetor. The airline feeds air from the crankcase of the motor into the tank to build up this pressure while the motor is running. The primer button simply fills the carb with fuel and doesn't do anything to pressurize the tank. As a pressure tank, the gas cap must be tight, and the rubber gasket inside the cap must be in good shape. The cork gasket under the cartridge on top of the tank must also be in good shape. The rubber o-rings in the fuel fitting must be free of cracks or dings.<br /> It sounds as if your motor isn't fully primed, or perhaps the carb needs a good cleaning. Both needles should be set at about 1.5 turns from closed - pay no attention to the numbers on the face plate. When you have everything adjusted for best running, only then will you loosen the center screw on the needles and center the small levers on their respective numerical scale. When you're done the needles will likely be about: Low Speed 1 1/4 turn from closed, High Speed 3/4 turn from closed. Final adjustment should not be done in a barrel, but rather on a boat , in gear. If the motor is allowed to suck in it's own exhaust, it will mess up the adjustments.<br /> You said you replaced the float - is the float level correct? Should sit level with the carb body when the carb is inverted. The manual with give you the specifics.<br />- Scott
