Hi, does anyone know if the mix screw on the carb screws in or out to lean off the fuel on a Fantic 205? also what fuel/oil ratio should it run on? Thanks, any info appreciated

80 to 1 on us gallon. In order to adjust your mixture, warm up the bike, turn up the idle, screw in the air mixture screw and rev the motor it will not rev down, then screw the air screw out at half turns until it revs down almost as quick as it revs up.

Use good synthetic oil at 50:1. The mixture screw on a Dellorto is a fuel screw not an air screw.