Wiki search tips:
Don't use the search box. Instead, use a combination of categories and your browser's "find" function. Like, say you want to find an article about the carb on a Motobecane. You go to the "Motobecane" category linked on the main page. Then there's a list of articles organized alphabetically. Alphabetical organization works on categories like the "Moped Jargon" one, but it's really not the best way to organize a bunch of articles that aren't named consistently like on most of the brand categories (and it'd still be a mess even if they were named consistently). So, hit CTRL+F and type "carb" into the little find box. (This how it works in Chrome, but I assume Firefox and Safari have similar functions). That will highlight "carb" every time it appears on the page, and then you can look at those articles to see if they have anything to do with what you want to know. Same goes for the repair and performance categories.
Also, if you need a manual, check out the MRA or google "Macbecane Mobylette."