when they are properly adjusted they will tap loud enough to hear them. You hear it more if you have a windshield on the bike, it reflects the sound up to your ears more.
When you dont hear them tapping then you have to worry they are too tight.
Did you let the bike sit overnight and adjust the valves with the engine stone cold? (say yes) If you ran the engine at all and then adjusted the valves, they wont be right.
Next time you check them see if they are within spec before you loosen the nuts. If they are in spec there is no reason it loosen the nut and set them again.
Last time I checked mine they were fine after 12,000 miles since the last check.
Also, make it easy on yourself - there is a range that is acceptable. For example if the intake is suppose to be within 4 to 6 thousands, if the 4 gauge will slip thru and the 6 wont - you are good. Some people try to get the exact snug feel on the middle gauge (5 in this example). Its a waste of your time, the engine runs over a wide range of temps, if the spec is 4 to 6, then thats close enough.
Last edited by KCW; 11-24-2018 at 08:02 PM.