The paint was supplied to Yamaha by Nippon Paint. I do not have the color code. The PPG or Sherwin Williams refinishing stores may have a cross reference by year/model/description. Even it they do, it may not match. Your best bet is to take a painted part into one of the refinishing stores and have them color match. BWC is dead on about working with test panels before you begin painting
If you have not worked with base/color/clear systems yourself it may be worth the money to just turn the job over to a body ship.
Drop a line and let us know how it goes