Johnson 115 Trouble

N

Noa's Ark2

Recruit
Joined
Jul 25, 2009
Messages
5
I have a 1974 Johnson 115 outboard.This boat has been down for about 6 years. I recently tried to run it and could not get it to crank. After awhile I got it to run on a garden hose and then in the lake. But you could not throttle it up, it would die. I replaced all the fuel line and it cranks better but when you throttle on it, it just plows through the water, it will not increase in RPM'S. This boat was running fine when it was parked,but has always been hard to start until warmed up. Any thoughts, Thanks
 
billy4hp

billy4hp

Petty Officer 1st Class
Joined
Jan 31, 2009
Messages
245
Re: Johnson 115 Trouble

Noa's Ark2 said:
I have a 1974 Johnson 115 outboard.This boat has been down for about 6 years. I recently tried to run it and could not get it to crank. After awhile I got it to run on a garden hose and then in the lake. But you could not throttle it up, it would die. I replaced all the fuel line and it cranks better but when you throttle on it, it just plows through the water, it will not increase in RPM'S. This boat was running fine when it was parked,but has always been hard to start until warmed up. Any thoughts, Thanks
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More than likely plugged carbs, you need to read through the stickies at the top of the forum (waking a sleeping outboard, etc)... Plan on changing the water pump impeller also unless you want this outboards new life to be short lived....
 
E

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: Johnson 115 Trouble

Do a spark check to make sure you have strong fire on each plug wire. Fuel will dry up in a sitting carb. Dried fuel will clog the passages in the carbs and it will not run. You'll need to overhaul the carbs. Spray some aerosol carb cleaner through all the passages to make sure they are clear, then reassemble the carbs. Make sure you remove both the high speed and idle jets and check each to make sure they are open.
 
N

Noa's Ark2

Recruit
Joined
Jul 25, 2009
Messages
5
Re: Johnson 115 Trouble

billy4hp said:
More than likely plugged carbs, you need to read through the stickies at the top of the forum (waking a sleeping outboard, etc)... Plan on changing the water pump impeller also unless you want this outboards new life to be short lived....
Click to expand...

Thanks for the help. I had already cleaned the carbs and they did have trash in them. But the main promblem seems to be the CDI box it is only firing on two cylinders.
 
N

Noa's Ark2

Recruit
Joined
Jul 25, 2009
Messages
5
Re: Johnson 115 Trouble

Thanks for all of the good help. The problem is with the firing it is only firing on two cylinders. Do you know where I can get a good buy on a CDI box Thanks.
 
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