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Displacement: 4.4 cu in (72.7 cc) Bore: 1.14" (29.0mm) Stroke: 0.87" (22mm Weight: 115oz (3260g ) Practical RPM: 1,200 - 7,800RPM Crankshaft Threads: M10x1.25 Center of Engine to Drive Washer: 3.4" (86mm Mounting Bracket to Center of Engine: 3.8" (96mm Mounting Bracket to Drive Washer: 7.2" (182mm Outer Diameter: 230mm Vertical Mounting Hole Bracket Centers: 80mm Horizontal Mounting Hole Bracket Centers: 110mm