I am less than 200 miles away from 18,000. did the plugs, cleaned the filter, changed the chain and sprockets, and had the tires changed for the first time, all this at around 10,000 miles. Like bear said the plugs probably didn't need changing but figured might as well since I was doing the filter, stock plugs still looked good. Only reason I did the chain was because I swapped the rear sprocket to A 44t so with the advice of the members here I had the chain and front sprocket done as well, went with an x-ring chain. I do regular oil changes at around 3000, lube the chain every 300 to 500 miles. Haven't checked the valves yet, and my versys runs like A champ, god I love this bike.