Richard (Rick) Losh, did the pinstripes. The Dunkel Blue parts have red and white stripes, with the exception of the upper side panels that have a single red stripe. The seat cowl in Scheme Code 130 was painted Dunkel Blue, but I choose to use Hell Silver with a single white pinstripe. Here is a short video showing Rick applying the pinstripes.
VIDEO: 1983 BMW R100RS Rick Losh Painting Pinstripes
Here some pictures of the pinstripe work, but I think the video is better able to show Rick’s technique built up over more than 40 years.