Decarbonizing 1999 Johnson 175 Carb.

[Bigshrimpin]

I don't know about the Johnson carbs motors . . .

On my Merc and Old Yamaha - I just shot the stuff down the throats of the carbs (while the motor was running) and followed the directions on the back of the powertune can which is a nice short version of the boat setup article.

The last time I did this . . . After the motor cooled down some during the soak period . . . I also removed the plugs and fired some spray directly onto the pistons. I turned the flywheel by hand to move the pistons back and forth to get a better shot at some of the heavier carbon spots. I don't know if that hurts (probably should talk to a professional), but the carbon seem to disolve away nicely.