Finished doing the top end rebuild, also took off the starter and chain. The bike started right up on the first kick and idled, however I heard a loud tapping sound. Sounds like it could be coming from the valve cover, like one of the tappets are hitting the cover? I made sure the cam was lined up correctly with the score mark on the alternator before I put the cam chain back on. Also, the bike didn't easily start a second time, but the carbs may be a little rich. Could this tapping sound just be from the lack of oil in the head, and will it go away after it has a few minutes to circulate the oil? Also I made sure to fill the two cam tubs with oil before putting the cover back on.