Mel wrote:How often do I need to have a 'major' service?
I am completely mechanically clueless so don't even really know the difference between the two.
For all intents and purposes:
Minor service = oil and oil filter change, air filter wash and reoil, carb balance. Takes a couple of hours if you stop for heaps of smoke breaks
Major service = as above, plus valve clearance check and sparkplug change. Takes between 3 hours (if the valve clearances are in spec), and a week (if the valve clearances are out and the shop doesn't have shims in stock).
On my own ZX6, the valve clearances needed adjustment once, when the bike had 10,500km on it. Every time I've gone digging around under the cam cover since, it's been to go, "Yup, still within spec... yup, still within spec... yup, still within spec..."