Not sure if its the "right" thing to do or not, but I had great results recently just pulling the plugs and silencer in my Ox66 motor, spraying a good dose of DeepCreep into each of the plug holes and each of the throttle bodies, then bumping the starter a couple times and letting it sit and marinate overnight. The next day, put her in the water, fired her up and watched the black goo drizzle out of the exhaust port for a minute along with lots of smoke.
After that, putt-putted out of the harbor, took her out for about an hour and she ran GREAT. Idled better, accelerated better, and according to the floscan, got better gas mileage (went from about 14-16 gph @ 4600 to 12-14 gph).