1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

johnhawg

Cadet
Joined
Jul 1, 2010
Messages
6
HELP! i bought a 1984 baja with a 115 johnson. it seemed to run great with muffs in the yard, but when i but it in the lake it would not go fast enough to even make a wake......
i looked at the motor with a friend and found a couple of problems that i have no ideal about fixing. to make a long story short, its got good compression 106 on all 4 cyls, good spark on all 4 also, "even checked @ 7/16 gap". but one bank of cylinders is not running! and it appears as if it changes from the left to right bank. " i found this by disconnecting the plug wires one at a time, " motor runs with both plugs on left bank disconnected" but as soon as i disconnect any plug from right bank motor stops".
could this be a timeing problem? carbs are rebuilt. and again, " all 4 cylinders have good spark all the time"
 

johnhawg

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Jul 1, 2010
Messages
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Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

i sure could use some help
 

PS94

Petty Officer 1st Class
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Aug 1, 2009
Messages
293
Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Well, if you've got spark, and compression, you'll need some fuel..Just cuz the carbs were rebuilt doesn't mean they work correctly!!
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,392
Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Well, if you've got spark, and compression, you'll need some fuel..Just cuz the carbs were rebuilt doesn't mean they work correctly!!

Great point.
How is the fuel delivery from the pump ???
 

johnhawg

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Jul 1, 2010
Messages
6
Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

seems like i got good gas, if bad, why only the lt bank of cylinders not running instead of top or bottom two?
 

johnhawg

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Jul 1, 2010
Messages
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Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

wondering if i need to take it to a shop, im really wanting to use the boat this weekend before i deploy over seas.
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,392
Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

Re: 1984 johnson, " good spark on all 4 cylinders but no power on 1 bank"!!!

If you are in a hurry then you may want to see if someone can help you out.
All the best to you overseas.
 
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