Poulan Pro 31Cc Trimmer Carburetor Adjustment. Learn how to adjust your poulan pro, weed eater and craftsman trimmer equipped with a za. Cut a 25ft length of line and insert one end into the center cavity of the empty spool.

Turn the hi jet screw counter clockwise 1 1/2 turns. The left screw is the “low” adjustment and the right screw is the “high” adjustment. The price was great and the delivery was fast from amazon.