77 model 85 Johnson

J

Jstall

Recruit
Joined
Jun 28, 2008
Messages
1
I have one cylinder not firing. Check fire with screw driver and get hot fire. Pull the plug and ground it and it is firing very good. Put it into cylinder it is not firing. Pull the plug after running the motor and it is shinny. looks wet but barely get anything on you finger when you wipe it. Is it a head gasket leaking?
 
Randybeall

Randybeall

Petty Officer 1st Class
Joined
May 2, 2008
Messages
319
Re: 77 model 85 Johnson

You need to check the basics of the engine, a compression test would be first. Cylinders should be with in + or - 10psi. Then check spark with a spark tester, 7/16 to 1/2 inch gap should be jumped by a strong blue spark. If both those items are good fire up the engine on muffs and check for all cylinders running. If you have a dead one try squirting some premix fuel in to that carb while at idle and see if it comes to life. If so overhaul the carbs. This should give you a good starting place, have fun.:)
 
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