There is a difference between tearing things apart and modifying them. Tearing it apart would mean you have Yama-guts all over your garage... a very sad sight. Modifying them means you have un-neccisary parts all over your garage, but more part put back on your Yamaha 'modifying' it. Think of it this way. You go to a store. You try on many different clothes, but you don't like the styles that the store put together so you take the blouse from one outfit and the skirt from another and ther you go, you've just done your own modification.
*disclaimer* These comments were not meant to offend anyone. This sight is not only for info, but also for some laughs. IMHO, of course.