140iB2 Specifications Sheet Cylinder Capacity 8.39 cu.in 137.6 ccm Power Rating 13.5 HP 10 kW Bore Diameter 1.88 in 48 mm Stroke 1.49 in 38 mm Weight 8.58 lbs 3900 g Speed Range 1200-8500 RPM Crankshaft 3 Ball bearings Connecting Rod Needle bearings on both ends Oil / Gasoline Ratio 1:50 - 1:80 Mix Ignition Input Voltage: 6.0 to 8.0 V 6.0 V NiCD / NiMH or 7.2 V LiPo / Li Ion Propeller 2-Bladed 28 x 12 30 x 10 30 x 12 32 x 10 32 x 12 3-Bladed 26 x 14 27 x 12 27.5 x 13 28 x 14