I have D-15 Series II that I had to take the carburetor apart because it was all varnished. After cleaning everything it still was not running to good. So, I tried adjusting the high speed idle screw (one on the bottom side) ran a little better but still not good and would stall. So, I tried the top idle screw. Well now I have totally messed it up!! I tried to do the adjustment the way the manual said but it did not work good. Is there another way to do the adjustment on it?? and/or if any one could tell me how to adjust it so it will run good again?? Thank for any and all help!!