Task: Explanation
Input (English): The Ducati 749 is a 90° V-twin Desmodromic valve actuated engine sport bike built by Ducati Motor Holding between 2003 and 2006. Designed by Pierre Terblanche, the 749 was available as the 749, 749 Dark, 749S, and 749R. It shared many of its parts with the 999, with the exception of a slightly smaller 180/55 profile rear tire, smaller cylinders, and different cylinder heads, giving it a smaller displacement of 748 cc. This smaller engine is higher revving and produces a lower peak horsepower than the larger engine used in the 999. The 749S model, like the 999, incorporates features rarely found on production motorcycles, including adjustable rake (23.5° or 24.5°) and five-position adjustable rearset mounts. Question: The desmodromic valve engine, widely used by Ducati, uses cams and levers to close its valves in place of what conventional mechanism? Answer: spring
Output (English): The Ducati 749 is a 90° Vtwin Desmodromic valve actuated engine sport bike built by Ducati Motor Holding between 2003 and 2006.