Yard Force 26 Dual-Stage, Electric Start, 208cc B&S YF26-DS21-GSBYard Force 26 Dual-Stage, Electric Start, 208cc Briggs & Stratton CR950 Snow Engine, Model YF26-DS21-GSB. Local Pick-Up is recommended. The YARD FORCE 26 in. Dual-Stage Snow Thrower is equipped with a Briggs & Stratton Snow Series CR950 208cc engine with electric/manual start to clear up to.