76 25 hp Evinrude running on 1 cylinder

R

rlwilson2

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Mar 17, 2012
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Last fall I bought a well maintained 25 hp 76 evinrude longshaft electric start motor. I mounted it on my boat (16ft John I made my self weighs about 325.) Ran good next time I took it out it ran well but would not rev high... took it out a few times on my pond (3 acres) slow running was not a problem... Started it today for first time this spring started messing with it and figured out that I can disconnect the top spark plug and it made no difference in the idle... so I am unfamiliar with the ignition.. and need some help trouble shooting... Thanks Bob
 
F

F_R

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Jul 7, 2006
Messages
28,195
Re: 76 25 hp Evinrude running on 1 cylinder

So, it was ok when you put it up, right? Check the simple things first----Spark plug!!!! Try a new one, or at least swap them around and see if the problem follows the plug.
 
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boobie

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20,826
Re: 76 25 hp Evinrude running on 1 cylinder

Get an open air gap spark tester and check the spark on both cyls.
 
kfa4303

kfa4303

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Sep 17, 2010
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6,094
Re: 76 25 hp Evinrude running on 1 cylinder

Hi rl. Welcome to iboats. I think you may have an ignition issue too. Unfortunately, your motor uses one of the newer "improved" ignition systems rather than the much loved old-school, mechanical, universal "magneto" system. I'm not terribly familiar with the exact form of electronic black magic they use, so I tend to stay away from them, but here's a link that can walk you through troubleshooting and rebuilding your system. Good luck. Keep us posted. Hope it serves.

http://www.sschapterpsa.com/ramblings/johnson_9.9_magneto.htm
 
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rlwilson2

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Mar 17, 2012
Messages
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Re: 76 25 hp Evinrude running on 1 cylinder

Thanks everyone! I will swap plugs and start going through it when I have a chance! Bob
 
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