2009 Suzuki VStrom 650, Engine FeaturesTwin spark plug cylinder heads for optimum combustion and reduced emissions.Compact 645 cc, 90 degree liquid-cooled V-twin, DOHC 8-valve engine tuned for strong low to mid rpm power90 degree V-twin cylinder layout eliminates primary vibration without a counterbalancer, keeping the engine simple and compactLightweight chain-driven DOHC, shim-under-bucket valve system with 31 mm intake valves and 25.5 mm exhaust valvesElectronic fuel injection system featuring the Suzuki Dual Throttle Valve System (SDTV) - maintains optimum air velocity in the intake tract for smooth low-to-mid rpm throttle response and high torque output - includes Auto Fast Idle System (AFIS)High capacity liquid-cooling system enhances engine performance and durability - coolant routing is integrated with the clutch cover and engine case for a cleaner look and reduced weightSmooth-shifting 6-speed transmission with vertically staggered transmission shafts for a shorter, more compact crankcase