I would ignore any sounds you hear till you ride the bike at least 5km to warm up the engine... maybe even 10km.
the most important valve adjustments are the first ones. I cant remember if its at 600 miles and 4000 miles, or just 4000 miles for the first time.
The reason is the new engine parts, esp the valves, wear in and seat themselves within the first few thousands miles of riding. So as the valves seat further into the heads, the clearance gets smaller (tighter)
if the tappets riding on the cam also wear in, they would tend to make the setting looser - so its a race between one surface or the other to see which way the adjustment goes for the first time.
After the first several thousand miles things tend to settle down and you usually find they are within the acceptable range when you check them.
If its the valves that are tapping that is not a terrible thing, unless they get really loose. Valves that are too tight, and dont make any tapping noise are a bad sign, because when they get too tight the valve stays open a little all the time, and the hot exhaust gases blowing thru the surface will melt the gap between the valve and the head seat.
They call them Tap-its for a reason: they are suppose to tap tap tap. If they stop tapping they are too tight. Bikes with hydraulic lifters dont make a tapping noise, you dont have one.
But short answer is: if you have not had them checked / adjusted for the first two intervals in the service table, definately get them done.
You can do it your self if you want to save money - its all screwdriver and wrench turning - but you have to take off the seat, the gas tank, the air intake box, and pull some of the wires off the carbs so you can loosen them and move them out of the way a few inches
then you take the fake plastic valve covers off to get (finally) to the tappet covers.
There are good websites that will walk you thru this step by step. If you follow the yamaha service manual they tell you to remove the carbs from the bike - which is more than you need to do. Follow the shorter instructions (might be on you tube) and just move the carbs out of the way. If you start pulling throttle and choke cables off, that is not necessary.
Last thing: get new o rings for the tappet covers - its about 2 to 3 hours to do the complete job, and if the o rings ooze oil because you re-used them, its 2 to 3 hours to replace it. They are $4 each and you need 4.
Last edited by KCW; 08-23-2018 at 06:51 PM.