I recently purchased a 97 Royal Star Tour Classic with 12,600 original miles. The bike looks as new, was running perfectly, idled smoothly at a low rpm and carburated and excellerated smoothly.
At the advice of Steve, my motorcycle, ATV, and boat mechanic for the last 25 years, I decided to give it a complete tune-up as the plugs were original and the tires needed to be replaced from old age. I am glad I did.
My mechanic (an independent gentleman who had worked several years as the lead mechanic at a large Yamaha dealership) found 3 intake valves that were out of spec (tight). Two were slightly tight, and the 3rd was actually out of spec. He has all the Yamaha service tools and was able to easily swap out the shims for the correct size to set the valves back to spec.
The bottom line is that I am glad that I had this done instead of waiting until the 26,600 mile (42,000 km) service interval.
Steve has also had experience swapping in V-Max cams into Royal Stars. The owner at the dealership he worked at had their very 1st Royal Star (his personal ride) modified as such by Steve.
I showed Steve (the mechanic) the threads from "pegscraper" on fitting the 32mm carbs. He thought that it was a "pretty neat" conversion, especially the custom turned carb bases, and also noted with interest the use of the V-Boost system actuated manually.
Bottom line, service your ride and don't ignore the valves. Any solid valve system needs to be checked as all valve trains wear, even those as well designed and understressed as the V-4 in the Royal Stars and Ventures.
Ironically, my Royal Star appears to be a cosmetic match to the "Pegscraper's" ride. Now iif it just had the "suds" like his has......
Keep the shiny side up and Ride like the other guy can't see you!!