I adjusted the tappets using the timing mark at TDC. Rode the bike and wanted to get the top end tapping noise to go away so after reading some of the posts, I adjusted them again after taking the cam cover off and using the timing mark on the cam at TDC. I test rode the bike and noticed the bike has a noticeable power increase. The tapping noise is still there but I am now believing this is just the way the engine sounds normally. I am living with the noise. I do recommend that you take the extra 2 minutes and take the cam cover off and use the timing mark on the cam gear at TDC to set your tappets.