"If you're not already usi
"If you're not already using a 50/1 fuel/oil mixture, do so.
If that milky substance is present at the exhaust outlet at the propeller area, that would indicate that oil is leaking from the lower unit, and water would be entering it.
If on the other hand, that milky substance is coming out the exhaust relief hole that exists halfway down between the powerhead and the lower unit, that indicates a leaking head gasket, something of that nature.
Check the compression and spark on the engine.
What is the model number of the engine?
The possibility exists that thr carburetor may need cleaning and rebuilding. If so, rebuild it, using a complete carburetor kit. The adjustment procedure follows.
(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)
Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.
Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.
Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.
Note: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.
When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.."
