Did a service on my CB400 a couple of weeks ago, in which I checked valve clearances (all AOK thankfully- cams out to adjust if you don't have the right tool to change shims with) cleaned/disasembled carbs, set pilot screws, and balanced carbs, as well as changing ALL the O-rings in the cooling system since the bike was so apart, and the radiator was out so I could get the valve cover off.....

Anyhow, took me 10 hours straight- put that at 60 bucks an hour and you have $600 plus parts...
Gatton Kawasaki quoted me $800 for a major service for my ZZR1200.....and it is heaps easier to service than the CB400, believe it or not....lotsa swearing doing the Honda- piece of piss doing the ZZR- pretty much the same as my ZZR1100 which was good to service too- time consuming but straightforward. E.g. to adjust the valveclearance- if a shim requires changing- you just move the rocker arm across and down beside the valve spring- this exposes the shim, and you can pull it out with a magnet or magnetised screwdriver- replace shim with new one, and put the rocker back- none of the cams out BS that a lot of other bike valve trains have!

Supposedly there is a tool you can buy to get the shims out of an engine like the CB but I've never seen it.
