1979 Johnson 25hp dropped a cyl,,,

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grouser · #1 Post by **grouser** » Mon Apr 13, 2015 5:01 pm

It will hit on it every once in awhile but for the most part it's dead. Put new plugs in it,,,nuttin, still only runs on one cyl,,,, any motabote mechanecks here???

teecro · #2 Post by **teecro** » Mon Apr 13, 2015 5:05 pm

Two things.... Have you tried to see if it is firing steady by grounding the plug and have you pulled a compression test?

r&s20 · #3 Post by **r&s20** » Mon Apr 13, 2015 5:42 pm

not real familiar with this motor, but if you have 2 coils swap coil to see if problem moves with coil. if it moves replace bad coil

grouser · #4 Post by **grouser** » Mon Apr 13, 2015 6:56 pm

teecro wrote:Two things.... Have you tried to see if it is firing steady by grounding the plug and have you pulled a compression test?

just a finger in the hole for compression. Felt pretty darn good
no spark when I pull the plug and hold it against the block

grouser · #5 Post by **grouser** » Mon Apr 13, 2015 6:57 pm

r&s20 wrote:not real familiar with this motor, but if you have 2 coils swap coil to see if problem moves with coil. if it moves replace bad coil

it does have two,,,, I will look into swaping them,,,,, thanks

curtiscapk · #6 Post by **curtiscapk** » Mon Apr 13, 2015 7:13 pm

sounds like coil to me...

GXPWeasel · #7 Post by **GXPWeasel** » Tue Apr 14, 2015 6:00 am

curtiscapk wrote:sounds like coil to me...

I agree. A coil would give that symptom of firing only when it feels like it (has the correct conditions to do so). I'd do what was suggested, and swap coils to see if the problem switched to the other cylinder.

Good Luck.

Pontoon Boat & Deck Boat Forum

1979 Johnson 25hp dropped a cyl,,,

1979 Johnson 25hp dropped a cyl,,,

Re: 1979 Johnson 25hp dropped a cyl,,,

Re: 1979 Johnson 25hp dropped a cyl,,,

Re: 1979 Johnson 25hp dropped a cyl,,,

Re: 1979 Johnson 25hp dropped a cyl,,,

Re: 1979 Johnson 25hp dropped a cyl,,,

Re: 1979 Johnson 25hp dropped a cyl,,,