1985 Johnson 30 hp Carb Question

[rick_l]

I am looking at a 30 hp Johnson for a friend. He says that the motor coughs and sputters. When the motor gets warm it's hard to start. He told me the carb has been bored so its equlvelent to a 35 hp. My first question is, when rebuilding the carb does it still take the orginal carb kit. My second question is what is an electric primer system and could this cause the problem described. It has a manual value but I don't know what to do with it.

 

[tashasdaddy]

Re: 1985 Johnson 30 hp Carb Question

the primer takes the place of the choke, instead of having a choke butterfly in the carb, you have a primer. that when you activate the solenoid, usually, pushing in the key with it turned to "on". the primer injects fuel directly into the intake manifold. the red handle has two positions, automatic, and manual. here is a picture of one in the automatic position, manual the red knob it turned 90 degrees.

the carb body was not modified, so i would assume you would use the original kit, as you are not changing the jets, just gaskets and core plugs.

 

[HighTrim]

Re: 1985 Johnson 30 hp Carb Question

(Fuel Primer Solenoid Function)
(J. Reeves)

The RED lever...... The normal operating/running position is to have that red lever positioned over top of the solenoid and aimed at the other end of the solenoid, gently turned to its stop. This is the normal/automatic mode position. Pushing the key in opens the valve within the solenoid allowing fuel to pass thru it in order to prime and start the engine. Looking upon this solenoid as a electric choke results in a better understanding of it.

Having that red lever turned in the opposite direction, facing away from the solenoid, allows fuel to flow thru it to the crankcase area. One would only turn the red lever to this position in a case where the battery might go dead and the engine had to be started via the rope pull method. Look upon putting the red lever in this position as moving a choke lever on a choke equipped engine to the full closed position. Either one would supply fuel to the crankcase/engine for starting purposes BUT if left in that position while running would flood the engine.

The later model primer solenoids are equipped with a schrader valve, used for attaching a pressurized can of fogging oil etc, available at your local dealership with complete instructions.

Pumping the fuel primer bulb up hard fills the carburetor float chambers of course, but that process also applies fuel pressure to the primer solenoid.

The two small hoses leading from the primer solenoid branch off via tees to each fuel manifold section that would feed fuel to the individual cylinders.

Pushing the key in activates the primer solenoid to allow fuel to flow thru it to the intake manifold passageways. Cranking the engine over causes the fuel pump to engage which in turn sends fuel pulses to the primer solenoid via the 3/8" fuel hose.

Some engines incorporates the "Fast Start" feature which automatically advances the spark electronically so no advance of the throttle is required for starting.
Engines that do not have the "Fast Start" feature will be required to have the throttle advanced slightly.

Starting procedure: pump fuel bulb up hard, crank engine and push the key in at the same time. When the engine fires/starts, release the key so that it falls back to the run position.

Bottom line..... Look upon the primer solenoid as an electric choke.

 

[flabum]

Re: 1985 Johnson 30 hp Carb Question

He told me the carb has been bored so its equlvelent to a 35 hp. .

The 30 and the 35 carbs are the same bore, but if the carb had been bored bigger, then the jetting has to be modified as well or the engine will run lean.


Carb kit will stay the same, but you might have to match the mounting gasket to the size of the bore.

 

[GFPRACING]

Re: 1985 Johnson 30 hp Carb Question

The red lever
if you were looking down at it
&
say it was a clock
what time would it be set at

i have a johnson 30 hp
& someone has turned mine

they thought it was the ideal adj

thanks george

(fuel primer solenoid function)
(j. Reeves)

the red lever...... The normal operating/running position is to have that red lever positioned over top of the solenoid and aimed at the other end of the solenoid, gently turned to its stop. This is the normal/automatic mode position. Pushing the key in opens the valve within the solenoid allowing fuel to pass thru it in order to prime and start the engine. Looking upon this solenoid as a electric choke results in a better understanding of it.

Having that red lever turned in the opposite direction, facing away from the solenoid, allows fuel to flow thru it to the crankcase area. One would only turn the red lever to this position in a case where the battery might go dead and the engine had to be started via the rope pull method. Look upon putting the red lever in this position as moving a choke lever on a choke equipped engine to the full closed position. Either one would supply fuel to the crankcase/engine for starting purposes but if left in that position while running would flood the engine.

The later model primer solenoids are equipped with a schrader valve, used for attaching a pressurized can of fogging oil etc, available at your local dealership with complete instructions.

Pumping the fuel primer bulb up hard fills the carburetor float chambers of course, but that process also applies fuel pressure to the primer solenoid.

The two small hoses leading from the primer solenoid branch off via tees to each fuel manifold section that would feed fuel to the individual cylinders.

Pushing the key in activates the primer solenoid to allow fuel to flow thru it to the intake manifold passageways. Cranking the engine over causes the fuel pump to engage which in turn sends fuel pulses to the primer solenoid via the 3/8" fuel hose.

Some engines incorporates the "fast start" feature which automatically advances the spark electronically so no advance of the throttle is required for starting.
Engines that do not have the "fast start" feature will be required to have the throttle advanced slightly.

Starting procedure: Pump fuel bulb up hard, crank engine and push the key in at the same time. When the engine fires/starts, release the key so that it falls back to the run position.

Bottom line..... Look upon the primer solenoid as an electric choke.