There is one for the MP3 300 LT ie here in the Wiki. Click on "Wiki" at the top of the page and under the "Model Directory & Model Specific Information" section look for the link at the end of the text "Model Directory". From that page you can see links to all of he manuals available by scooter model, grouped by marque.
Good luck. Oh and I would suggest getting dressed even for riding an MP3 to the shops to avoid any public decency hassles.