Tillotson High/Low-Speed Mixture Screw Spring adds tension to the carburetor's fuel mixture screws on the high and low side circuits to hold them to the carburetor.
Running the screw out more than 3 turns risks the adjustment screw backing out. To temporarily fix this problem, add an extra mixture screw washer. If you are experiencing tuning screw adjustments more than 3 turns out you may have incorrect carburetor, carburetor problems, or fuel delivery issues. Contact your engine or carburetor builder if you cannot fix your issues.
24B-449 OE Tillotson High/Low Speed Mixture Screw Spring Fits HL-1A HL-129E,HL-132H,HL-166B&C,HL-189F,HL-227A,E,HL-229A,HL-321E,HL-232A,E, HL-250A,B,C,D,E HL-274E, HL-,292G,HL-293A,F,HL-299E,HL-304E, HL-304WX,WXA,WXG,HL-306A, HL-314E,HL-314F&G, HL-324A,HL-334A,AA,B,AB,WX,WXA,WXG,HL-339A,HL-341A,HL-342A, HL-348A,B,C,D,E, HL-352A,HL-355A,B,C,D,E HL-357A,B, HL-360A, HL-360B,C HL-365A&B,HL-366A,HL-368A,HL-371A,HL-374A, HL-380A,B, HL-383A, HL-384A&B, HL-385A, HL-388A,HL-395A,HR-181B,HR-184A,HR190A,HR-191C,HR-191G,HR-196A,HW-10A,B HW-11A,B, HW-12A, HW-17A, HW-19A, HW-22A, HW-23A, HW-27A, HW-30A, HW-31A, HW-32A, HW-33A, HW-34A, HW-35A, HW-43A, HB-10A, HB-11A, HB-12A, HC-103A,HC-112A, HM-1A, HM-2A, HM-12A, HX-10A, HX-12A