I have heard they are good for 20,000 before any adjustment is necessary. Again this is simple. Just remove 6 Alan bolts on each head, and adjust away. Half an hour tops . The six carbs may sound like a nightmare to synchronize, but this is only a 20-minute job.
Shaft drive means no messy chains or adjustments.
Just change the oil in the rear every couple of years, full service around 6000. Hydraulic clutch and brakes means no adjustments for wear and tear. The aftermarket accessories you can buy for the Valkyrie. is second to none, and there is more coming out all the time. I have bought parts from England, the States and the North of Ireland. There must be about 5 different crowds that make seats for it, so there should be something for everyone in the audience.