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Power (PS): 11,7. Power (kW): 8,7. Engine type: 1-cylinder 4-stroke, air-cooled. Series/model: GX390 / GX390UT2XSHQ5. Cylinder capacity (cm³): 389. Crankshaft Ø (mm): 25. Crankshaft length (mm): 63. Crankshaft arrangement: horizontal. Crankshaft type: cyl Read more.