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An Italian sport-touring bike, theÂ Ducati ST4s Desmoquattro was in production from 2002 to 2005. It has a liquid cooled, v-twin 996cc engine and a top speed of 161 mph (259 km/h).
The ST4s gets its desmoquattro name from its engine, which has four desmodromic valves per cylinder. Desmodromic valves close the cylinders with a cam and lever system as opposed to the more conventional spring system.
The ST4s Desmoquattro was based on and was largely unchanged from the Ducati 996 engine. Although the ST4s made slightly more power and torque than the 996 Super-Bike due to the mostly straight-through design of the ST4s' exhaust, compared to the under-seat exhaust of the 996. The ST4s'chassis design was based on the ST4 but with the 996's larger engine, and new improved suspension. The ST4s had standard colour matched luggage and came equipped with a center-stand, an accessory power outlet, and could also be equipped with ABS starting in 2003. The 2004 model also had a trip computer.
At speed the ST4s' ergonomics are great. Compared with other sport-tourers, the ST4s has quite a sporty riding position. A torso-forward riding position is best suited on long trips at highway speed; riders will want much-needed weight over the front wheel to help keep the tires on the road. Overall the ST4s is an amalgamation of all the best parts of Ducati's ST4 and the 996, it is one heck of a ride.