Suzuki Dual Throttle Valve (SDTV) digital fuel-injection system. In SDTV induction system, each
throttle body barrel has two butterfly valves, a primary valve controlled by the twist grip and a
secondary valve controlled by the ECM based on engine rpm, gear selection and the position
of the primary valve. The secondary butterfly valve opens and closes to maintain ideal intake
air velocity, improving high combustion efficiency, thus resulting in a linear throttle response,
increased low-to-mid range torque.