carb problems 120hp force 1992

jaba

Seaman
Joined
Nov 2, 2003
Messages
60
Spring is finally here.. Opened my engine cover for the first time in months and noticed the following: The bowls under the carbs have a drop of really oily gas under them. The bowls have a srew at the bottom. Suppose this is for draining, right? Is it possible that the left overs from summer are leaking out of the bowl and do I need to change the seals to carbs?<br /><br />And an other thing.. If the needle valve(s) leaks, is it possible to have such a rich mixture that it blows unburned gas out of the exhaust port? Cant notice the oily water when driving, but when engine idles, it really shows. Engine runs great and works good at any revs. I had these problems last summer and I havent check compressions yet. As I turn the engine by flywheel with hands, there doesnt seem to be differences between cylinders, but that is just a wish.. Ive read that it could be a burned headgasket. <br /><br />-jaba-
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,754
Re: carb problems 120hp force 1992

If the engine idles at 800 rpm, and it runs ok, I would not mess with it. <br /><br />These are not clean burning engines, and I would rather have a rich running engine, than risk running lean and burning up my engine.
 

bradley1393

Cadet
Joined
Sep 16, 2003
Messages
15
Re: carb problems 120hp force 1992

very likely oily substance is fog oil or oil itself. Often runs out carb throat and drips off. If the carb does not leak when fuel is pressureized it is not a worry. As far a rebuilding these carbs...they are very simple. Probably just needs cleaned. I very seldom every replace parts....if anything usually a gasket. Mercury makes 2 products very good for this cleaning....power-tune and mercury component cleaner.
 

jaba

Seaman
Joined
Nov 2, 2003
Messages
60
Re: carb problems 120hp force 1992

Thank you Roscoe and Bradley! Will clean the carbs after testing if bad.
 

bayliner12

Petty Officer 2nd Class
Joined
Jul 9, 2007
Messages
145
Re: carb problems 120hp force 1992

i have a 1991 120 H.P. L drive it starts right up and runs great, after it sits for 5-10 minutes it has trouble starting and i can smell gas, I'm guesiing fuel is leaking into the cylinders, any ideas?
 
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