Charon
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I'll probably catch flak - again - but here goes. Valves that loosen do not cause problems. All they do is get noisy. Valves that tighten can cause trouble, because if they tighten enough they will not seat; will leak; and may burn rapidly. I would not worry too much about having the service done at exactly 600 miles (which is 1000 km, rounded). It will no doubt survive for a while longer, but I WOULD want to have it done before, say, 1000 miles. Valve adjustment on this bike is to be done with the engine cold, which is taken to mean it hasn't been run for at least four hours before the adjustment. Shops usually want you to bring the bike in the day before so it can cool overnight.
As Verslagen said, the service is supposed to entail retorquing the head bolts. This requires removing the head cover. According to the Clymer manual, on some bikes the head cover cannot be removed with the engine in the frame. A reputable shop which actually looks up the bike will have to estimate the job with engine removal in mind, and shop rates are likely to run at least $80 per hour. The rocker arms are mounted to the head cover, so removing the head cover will mandate checking and probably readjusting the valve clearances. It can turn into a labor-intensive job. My guess is that the guy who quoted $600 might not be far wrong, and the guy who quoted $200 has no plan to remove the engine - which means he may not do the whole job.
JOG is correct. If you plan to have a shop do the maintenance as scheduled, this is an expensive motorcycle. But it isn't alone. Quite a few motorcycles have what is known as "shim under bucket" valve adjustment, which means any adjustment requires removing the cams. Labor charges are high, and the adjustment is done by purchasing and replacing shims.
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