slight tapping noise in engine?

[aj1soad]

Ive got an 03 fazer with 17900 on the clock. After repairing a hole in the exhaust, changing the oil ad fitted new plugs I've noticed that there is a tapping noise coming from the head. I can hear it on both sides but its louder on the right side. It there all the time even when the bike is warm. I tend to hear the sound more when im on the bike. Is this normal for fazers?