Adjusting float to affect mixture

[Kevin Nortness]

I've got a 1986 40hp evinrude motor that's coughing and wanting to stall while accelerating. The carbs are model 395790. I did a cleaning on both of them, then this problem developed. This model has fixed high speed and low speed orifices, so if I understand right, they can't be adjusted (I didn't pull them out during cleaning). When I first took them apart, I noticed both floats were tilted upwards from parallel, so I leveled the new ones out and set the float drop within specs. Now I'm wondering if the last person to service these carbs knew something I didn't. I'll take them apart again and bend the floats back upwards, but I wanted to check first if anybody knew exactly what that kind of change this is effecting. My guess would be that it's leaning out the mixture. Thanks, Kevin

 

[joereeves]

The floats have nothing to do with the amount of mixture flowing thru the fuel passages/jets. Adjust the floats as follows and carefully clean the jets with a piece of single strand steel wire as solvent just doesn't do that job properly.

(Carburetor Float Setting)
(J. Reeves)

With the carburetor body held upside down, the float being viewed from the side, adjust the float so that the free end of the float (the end opposite the hinge pin) is ever so slightly higher (just ever so slightly off level) than the other end. And when viewed from the end, make sure it is not cocked.

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