Recommend Oil / Mixture

DHutch

Cadet
Joined
Jun 24, 2007
Messages
24
I have a 1980 140HP Johnson on a 17' ski boat. Boat / motor does not get a lot use, approx twice a month during the summer for day trips and skiing. I have always noticed some oil / fuel stains on the the tower housing, just below the cowl after use, not excessive but enough to wonder where this is coming from. This oil / fuel is wet, so I know it is recent. All hoses seem to be OK, clamps are tight, etc. Since the engine does have a lot of down time between use, it requires a lot of priming to get started. Can this be causing fuel leaking out of the carbs / air cleaner? Could it be the type of oil, I use Shell Nautilus, are there oils out there that are cleaner? I use a 50:1 mixture which seems normal. How clean should a 30 year old engine run?
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,392
Re: Recommend Oil / Mixture

When was the last time the carb's were serviced ???
Welcome to iboats.
 

DHutch

Cadet
Joined
Jun 24, 2007
Messages
24
Re: Recommend Oil / Mixture

I dismantled and cleaned them 2 seasons ago, boat was not used last season. Have always noticed fuel stains before and after carbs were cleaned.
 
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