1959 Johnson sea horse 10 hp

[north red river]

So i've been having problems with my motor as of late with the oil/gas mix getting on one of the plugs after it has been run for awhile "15 minutes" at slow or fast speed.....what could the cause(s) for this be?

[boatfixer]

Which cylinder? Is the plug wet and sooty? or just wet and clean?

[north red river]

There's a plug on the top and one underneath it........it's the bottom one. The first time it happened it was wet and sooty...next time it was wet and clean.

[boatfixer]

I guess I forgot to ask how it runs. Wet and clean (still looks new) suggests no spark. Have you done a spark and compression test?

[north red river]

It runs ok for awhile but then it seems to hesitate a lot and when it's at its worst it only runs about half speed....smells gassy...opened it up and gas was dripping from the carb. Maybe it could be flooding out?? Have not done a comp or spark test.

[marine_man]

I would check for spark first since it should rule out most iginition problems.

If the plug is consistently wet it sure sounds like it's getting flooded out by the carb. Might be time to look into cleaning the carbs.

marine_man

[boatfixer]

Yeah, I agree. If it starts off running just fine and progressively gets worse, then it is probably flooding. Bad needle and seat, high speed jet adjustment too rich, float bowl vent plugged.