1977 Johnson 115 hp spark issue

stlled

Recruit
Joined
Jun 11, 2013
Messages
4
Have to reach out on this, I have a 1977 Johnson 115 hp, I have a spark issue.
I get spark out of one side of the engine only, I swapped a coil to the opposite side it sparks, the spark in my opinion is weak. Its a bluish yellow... I was leaning towards the issue being the power pack, but also considered a stater issue. any advise on the testing of the power pack or the stater? I dont want to drop $125 on a power pack if its not going to fix it.
thanks in advance
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: 1977 Johnson 115 hp spark issue

If you go to the CDI electronics website they have a great trouble shooting guide, just look up your engine and follow the checkout procedure. It will help you find your problem.
 

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: 1977 Johnson 115 hp spark issue

Specifically, check the stator cranking output and compare it with the CDI minimum requirement.
 
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