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Water in both cylinders force 50hp

Peter 50

New member
I'm getting water in both cylinders on my 50hp force. It runs perfectly above idle, same top speed as usual but at trolling speed it takes coughing spells or runs on 1 cylinder sometimes. If rev it up it will be ok for a while. When I check the plugs both have a bit milky residue on them.i checked the gas and it's clean.
Can there be any other places that can let moisture in?
I'm sure it's not a head gasket cause it runs perfectly above idle and if it were it should only affect one cylinder.
 
The gaskets bad?
Or the blocks cracked?
I'd pull the head and check the gasket.

1988/85 hp had a tiny miss, great compression all 3 cyl.
Then water on one plug.
Still great compression.
Pulled head and found a pinhole in the gasket.
 
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