Ducati's first-generation Monster lineup included the M600, M750, and M900, each denoting the engine size. The M600 debuted in 1994. In 1998, Ducati introduced the Monster Dark series, starting with the M600 Dark. To clear out existing Monster parts, Ducati released several limited edition models in 1999, including the notable Monster City, featuring unique blue color, leather briefcase-style saddlebags, and raised handlebars. Additionally, starting in 1994, Ducati produced the M400 for select markets with strict regulations on engine size and power, such as Italy, Japan, and Singapore, along with export to countries like Indonesia, the Philippines, Taiwan, and Thailand. The M400 shared components with the M600 but featured a shorter stroke crankshaft and smaller diameter pistons.
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