ENGINE DESIGN 1-cylinder, 4-stroke engine DISPLACEMENT 690 cm³ BORE 105 mm STROKE 80 mm POWER IN KW 54 kW STARTER Electric starter LUBRICATION Forced oil lubrication with 2 oil pumps TRANSMISSION 6-speed PRIMARY DRIVE 36:79 SECONDARY GEAR RATIO 16:40 COOLING Liquid cooled CLUTCH APTC(TM) slipper clutch, hydraulically actuated EMS Keihin EMS with RBW, twin ignition CHASSIS FRAME DESIGN Chromium-Molybdenum steel … Continue a ler 690 DUKE