1989 Mecury 35hp OB "oil injected" excessive blue smoke

M

MadMax350

Recruit
Joined
Jun 18, 2007
Messages
1
Hello, I have a 1989 Bass Tracker boat with a 35hp 2-stroke Mercury OB that bears the decal "oil injected". However, the oil unit inside the boat says "autoblend". Recently, I have noticed excessive blue exhaust smoke and rough idle accompanied by the occational dropped cylinder / fouled spark plug. WOT she runs fine.

Based on what I have been told about these autoblend systems, it sounds like mine has started to fail and I should remove it and just pre-mix. That's not a problem; but I need to know what fuel/oil mix to use in this engine.

Are these 50:1 or 100:1 engines?
 
J

jebeebe

Petty Officer 1st Class
Joined
Nov 26, 2006
Messages
322
Re: 1989 Mecury 35hp OB "oil injected" excessive blue smoke

should be a 50:1 blend. I agree you are right junk it. If you have a built in tank, just dump in the right amount of fuel for say 10 gals and pull in to the fuel station and pump in 10 gal. If you can't get quite 10 gal in, it will only make it a little rich. Better than lean. I ran 25:1 for breakin oil on an overhaul and it hardly smoked. I feel much more at ease knowing I have oil in the gas. I had a 150xr4 with oil injection and never had any trouble in 10 years ,but I always had this nagging in the back of my mind. If you burn down a 150 youre talking serious change. Good luck................Jerry
 
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