Fuel-injected, 50 cubic inch (805cc), eight-valve, liquid-cooled, 45 degree V-twin engine tuned for exceptional low rpm power and torque.GSX-R-derived electronic fuel injection system features 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).