31E877, 31L777, 31M977, 31Q677, 31Q777, 31S777, 31S877, 31S977, 31U977,331707, 331777, 331807, 331877, 331977, 33M677, 33M777, 33M977, 33R777, 33R877, 33S777, 33S877. F1 Distribution: 4109734. Briggs & Stratton B&S Engines Intek OHV Professional Series 17.5 - 21bhp.
