OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Trimmers and Brushcutters McCulloch Trimmers & Brushcutters dose any one know the

The procedure is as follows for a walbro carby.

Step 1: Bottom both screws.

Step 2: Back off the 'H' (high) screw one turn.

Step 3: Back off the 'L' (low) screw one and a quarter turns.

Step 4: Start machine then open 'L' screw till you do not have any hesitation (or very little) going up to full RPM'S.

Step 5: On full thrittle adjust till the machine is running at maximum RPM'S and then back off the 'H' screw by 1/8 of a turn.