I replaced the top end on my blaster 4-5 days ago & have been breaking it in. For the first hour or so of the break in process the spark plug was a dark gray & thought i was running it lean so i dropped the clip to richen it up for the remainder of the break in & now the plug is black & just barely wet but its been running great! Today i noticed that the top end has started making a noise when before i couldnt hear any kind of engine noise at all! All the bolts are tight & i have retorqued everything already so Im wondering if i need to tear it back down? The crank bearings seemed fine & the rod play was fine...i had checked all that prior to replacing the top end. Its my first blaster & ive read they make noise but im still kinda worried since it wasnt making any noise & it is now...its not loud & i can only hear it at an idle...almost sounds like valve noise to me if it had valves! Any insight would be appreciated!