I just got my honda 2 smoke 2 weeks ago! Can't get my jetting correct, plug fouling and very black, smokes.. Typical problems. I've dropped the jetting down to 380 main and 35 pilot air screw 2 1/2 to 3 turns out (big drop) still rich so I dropped the float (it was set correctly according to the manual) 1mm to 8.5mm and it did help but didn't fix it! my elevation is 5800 ft! Reason I feel the float is high: first day I got it, it was loosing a bit of gas out of the overflow while it was in my truck and fouling plugs bad before any adjustments so I did the above and now after the adjustments: after idling for 10 to 15 seconds during a ride (stopped talking...) I can hear the sound of the engine, it change as if the float bowl has been given time to fill while not using much gas? Also if its shut off for even a short few mins, I start it, it smokes excessivly and if I give it throttle right away it'll foul the plug. The Idle does sound lean after the engine has been run hard, again for only a few seconds (it should be a little lean with that pilot and air screw out that far) till the float bowl is given time to overfill? P.S. air screw adjustments don't seem to change much as if the float level is still slightly high.