The Improbable Bulk
Join Date: Jul 2005
Location: Wilkes-Barre, PA
There is special paper for decals. Search google for a plethora of choices. I believe they are mostly inkjet, and that would seem like the reasonable choice. I don't know whether laser would add value to the process, I would use inkjet if I were print my own decals.
Are you looking to recreate the original decals, or just create some of your own design? If your own design, you can measure with a tape measure and figure out what size seems best to you. If you are looking to recreate the originals, you need to let people know what model and year your bike is. Then someone with the right model can take measurements. Also, the proper decals, or a copy of them, may be available from people who create decals.