Took delivery of my Pan Am last June. Now have 11k miles on it. Wonderful bike, very pleased with it's performance, handling, comfort. However, I have learned that the maintenance schedule specifies replacing the four spark plugs every 10k miles! This is in addition to a fairly expensive service of torquing fasteners and checking wiring connections that is supposed to be done every 10k. I've owned and ridden motorcycles for over 50 years, including at least one of every widely sold brand. I've never had to change plugs that often on a four stroke engine. With the electronic ignition and fuel injection now common, it's hard to imagine this is really necessary. Has anyone seen their plugs after 10k, or have any experience with this?