I do mine as and when. I try to do the oil every 4000 miles on the commuter bike and once a year on the VTR which doesn't do many miles. I always do oil and filter together and the airfilter is cleaned once a year on the vtr (K+N) and about the same on the cockroach. I do the fork oil every other year (more often on the vtr as it goes through the occasional seal) and brake fluid once a year (but I have a habit of changing calipers and master cylinders and things) Coolant, I only change if it leaks and bearings, wheels, tyres, forks, lights etc I check fairly often on the cockroach, every month or so. This is just the way I do things, not a recommendation and is based on my usage. I also go with Techno on the belief that service schedules are over cautious and as such don't mind going over the distance on the cockroach. If I do a trackday then all the above changes and I will thoroughly check everything before hand and change the oil.