cool bikes, forerunner of the watercooled GSXR motors.
While tyres will probably be quite expensive, modern dual compound radials last a lot longer than old bias ply on CB's. ( I'm pretty amazed on my 600, 1,500 miles and doesn't show wear, bias ply (Metzelers. Pirrelli Phantoms, etc) on 550 were worn out by 2000 miles)
Full service at dealer is likely to cost a bit but shouldn't need doing again for at least another 15~20,000 miles (except oil/filter, air in tyres and chain lube)
PJ