2005 Suzuki Select Model, Compact 4-stroke, four-cylinder liquid-cooled engine with DOHC, 16-valves, Twin Swirl Combustion Chambers, plus gear-driven counterbalancer for smooth operationElectronic fuel injection system, fed by 46mm throttle bodies and ram air intake with large volume airboxLightweight shim-under-bucket valve train with narrow 14 degree valve angle for high combustion chamber efficiencyHigh efficiency liquid cooling system for optimum engine operating temperature, including compact air-cooled oil cooler and oil-jet piston coolingSCEM (Suzuki Composite Electro-chemical Material) plated cylinders minimize cylinder size and improve heat dissipation6-speed transmission with high-capacity clutch featuring back-torque limiter system for smooth downshifts and scissors-type primary gear for reduced gear noiseLarge volume 4-into-2 exhaust system with stainless steel head pipes and lightweight aluminum silencersDigital direct-ignition system combines an ignition coil with each spark plug cap for reduced weight and stronger spark