The Himalayan is tank off, screw out a cover then feeler gauges, spanner and screwdriver. Call it an hour the first time 30 minutes after that. My 1973 Honda has a very similar system.
The CB500 has the tray with the coils in the way after the tank is off and the head cover has to come off after that. Took me three hours. I was OK, nothing to adjust, but if you did have one out you need to remove, measure (add a micrometer to your tool kit?) and order a shim. The removal has the easy if scary looking Honda system of pulling the follower shaft. The shims are a standard size, so a workshop will have a set to exchange, at home you'd be waiting for the Postie. I would not want to do this in the car park of the Holiday Inn Express in Marakech, but then again I'd be pushed to do 16000 miles and not pass a Honda dealer or my own workshop.
It's the shaft versus chain argument all over again, do you want to do a simple job often or a big one less often.
Andy
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