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1985 90 HP evinrude oil foamy residue in on cyl

J

Jammer

New member
I have a 90HP evinrude that has three cylinders with 90 LBS compression and one with 130 LBS compression. The cylinder with the high compression has oily foam on the plug. I replaced the head gasket and found white oiy foam (water) in cylinder thus the higher compression. The old gasket looked good, cylinder looked good and the head looked good. Where else could I be getting the water from??? this thing starts and runs good, although has very slight miss at slow speed. Also foamy sludge coming out of the exhaust.:confused::confused:
 
Which cylinder has the high compression and the water #1 / 2 / 3 / or 4 ??------What other history is there on the motor , as in has it been apart before?
 
It is on the top left from back, #2?? starter side. I have had this motor for eight years or more and I have not had it apart. I have never seen the sludge coming out of the exhaust before. It has been sitting for two years only run once last year just to check it out. Replaced rotten fuel line at that time. Found the issue doing compression check with buyer (not).
 
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