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I have a 1999 Suzuki GSF600S. When it's idling I can hear a ticking noise coming from the engine. The frequency of the tick is in line with the engine's RPM. Does this most likely mean I need to do the valve adjustment service?

I have a Haynes Manual but I never done any maintenance before that involves removing valve covers or getting into the engine's internals. If that is what the noise most likely is I guess there's no time like the present...

I was just about to post the same thing about my bike and saw this one. I just started having the same exact noise/problem with my bike. THe ticking increases with the higher rpms (and becomes louder, so much so that it is annoyingly loud on highway) I have a ninj 250, 2000 miles on it. I push it kinda hard and do the normal newby crappy job of shifting and stuff. Hope I didn't flub it up.

The first place to start looking for a noise in the valve train is to check the valve lash and adjust if necessary. Have a good look at the cam chain and tensioner while you are poking around in there.