Power (PS): 11,7. Power (kW): 8,7. Engine type: 1-Zylinder 4-Takt, luftgekühlt. Series/model: GX390 / GX390UT2XQA4. Cylinder capacity (cm³): 389. Crankshaft Ø (mm): 25,4. Crankshaft length (mm): 88,5. Crankshaft arrangement: horizontal. Crankshaft type: Read more.