Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 96Get this manual
If the choke should stick in the open position, the engine will be hard to startIf the choke should stick in the closed position, the engine will flood making it VERY difficult to startIn order for this raw fuel to vaporize enough to burn, considerable air must be added to lean out the mixtureTherefore, the only remedy is to remove the spark plugs; ground the leads; crank the engine through about 10 revolutions; clean the plugs; install the plugs again; and start the engineIf the needle valve and seat assembly is leaking, an excessive amount of fuel may enter the intake manifold in the following manner: After the engine is shut down, the pressure left in the fuel line will force fuel past the leaking needle valveThis extra fuel will raise the level in the fuel bowl and cause fuel to overflow into the intake manifoldA continuous overflow of fuel into the intake manifold may be due to sticking inlet needle or to defective float which would cause an extra high level of fuel in the bowl and overflow into the intake manifoldFUEL PUMP TESTS