Hi There,
I am new to the forums and equally as new to outboards (or any engines of that kind to be honest). I recently bought my first boat with a 1965 Johnson 40hp, model number RD-27M (Serial # C447331).
It was dropping power suddenly and slowing to a crawl, then it would suddenly pick up, then drop again and stay sluggish. The plugs would become completely fouled (both carbon and oil deposits). I have since change the fuel oil ratio to 50:1 (it was running 30:1). I have also changed all fuel lines and put in a fuel filter on one of them (see pic below, someone please tell me if this is ok?). I have also thoroughly cleaned the carb and changed the plugs too. Everything I have done so far is from reading these forums, so thank you. However I am now stuck...
Fuel filter (is this the correct place to put it?):
Since doing what I said above, I have started the engine. It ran for about two minutes, during which time I attempter to adjust the rich/lean screw on the carb to as lean as possible however I could not get it to stop kicking every 5 seconds. After it cut out on me I checked the plugs and this is what they looked like (one has more oil on it, the other more carbon):
I can only assume it is running way too rich, however I have no idea how to rectify this... I had taken this apart:
I'm assuming this is the fuel pump? I set it so that the coiled metal piece inside is essentially just resting on its mounting point and has not been coiled tightly as I assumed this is the leanest setting?
It is poignant to note that when I took the old plugs to the shop they told me the Champion J8C was the correct replacement, however from reading further on here I have found that the J4C should be used. I'm going to go buy a set of those now, would this fix my problem by any chance? Also, I read something about re-floating the carb and how to set it. I'm going to take the carb apart again to see if it is set correctly (as per what I have read on here), I'm assuming this may also cause the issue I have?
Also, the area around the plugs (I think this is the powerhead?) is very hot to the touch, yet there is a steady spray of water that comes out the back. Is there a way I can check to see if the watercooling/thermostat is operating as it should? I have no idea where the thermostat is or even what it looks like...
One last thing, the adjustment for idle here:
Will that help me at all?
I know there are a lot of questions here. I have tried to educate myself from these forums, however I need direct answers from 'the knowledgeable ones' :joyous: to get this thing running as it should.
Any help is greatly appreciated. By the way, anyone else here from New Zealand?
Many Thanks,
David
I am new to the forums and equally as new to outboards (or any engines of that kind to be honest). I recently bought my first boat with a 1965 Johnson 40hp, model number RD-27M (Serial # C447331).
It was dropping power suddenly and slowing to a crawl, then it would suddenly pick up, then drop again and stay sluggish. The plugs would become completely fouled (both carbon and oil deposits). I have since change the fuel oil ratio to 50:1 (it was running 30:1). I have also changed all fuel lines and put in a fuel filter on one of them (see pic below, someone please tell me if this is ok?). I have also thoroughly cleaned the carb and changed the plugs too. Everything I have done so far is from reading these forums, so thank you. However I am now stuck...
Fuel filter (is this the correct place to put it?):
Since doing what I said above, I have started the engine. It ran for about two minutes, during which time I attempter to adjust the rich/lean screw on the carb to as lean as possible however I could not get it to stop kicking every 5 seconds. After it cut out on me I checked the plugs and this is what they looked like (one has more oil on it, the other more carbon):
I can only assume it is running way too rich, however I have no idea how to rectify this... I had taken this apart:
I'm assuming this is the fuel pump? I set it so that the coiled metal piece inside is essentially just resting on its mounting point and has not been coiled tightly as I assumed this is the leanest setting?
It is poignant to note that when I took the old plugs to the shop they told me the Champion J8C was the correct replacement, however from reading further on here I have found that the J4C should be used. I'm going to go buy a set of those now, would this fix my problem by any chance? Also, I read something about re-floating the carb and how to set it. I'm going to take the carb apart again to see if it is set correctly (as per what I have read on here), I'm assuming this may also cause the issue I have?
Also, the area around the plugs (I think this is the powerhead?) is very hot to the touch, yet there is a steady spray of water that comes out the back. Is there a way I can check to see if the watercooling/thermostat is operating as it should? I have no idea where the thermostat is or even what it looks like...
One last thing, the adjustment for idle here:
Will that help me at all?
I know there are a lot of questions here. I have tried to educate myself from these forums, however I need direct answers from 'the knowledgeable ones' :joyous: to get this thing running as it should.
Any help is greatly appreciated. By the way, anyone else here from New Zealand?
Many Thanks,
David
