dead cylinder on '77 Johnson 25hp

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coonass729

Recruit
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Sep 1, 2003
Messages
2
The top cylinder on my '77 Johnson 25hp motor is not firing. Spark plugs have been replaced with no improvement. I suspect either the coil or the power pack is bad. Is there any way to tell whether one or the other is bad without professional electronic equipment? If so, how easy are they to replace?
 
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Backlash

Chief Petty Officer
Joined
May 16, 2001
Messages
586
Re: dead cylinder on '77 Johnson 25hp

You could switch coils from a firing cylinder with the dead cylinder. If the "dead" comes "alive" you've found a bad coil.<br />Backlash
 
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coonass729

Recruit
Joined
Sep 1, 2003
Messages
2
Re: dead cylinder on '77 Johnson 25hp

Thanks for the reply, Backlash!<br /><br />That's something I just thought about. I was about to just cross the plug wires but realized that the timing would be completely backwards. Do you happen to know if the coil connections are plugs, or are they usually hard-wired? (Don't have the motor here in front of me.)
 
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Backlash

Chief Petty Officer
Joined
May 16, 2001
Messages
586
Re: dead cylinder on '77 Johnson 25hp

I've seen them both ways. Can't say for sure what your '77 has but I believe the plug wire is integral to the coil and the wire to the primary winding is a bayonet type connection. Should be an easy switch.<br />Backlash
 
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