Alright, so I've finally decided to try to fix the noise in the engine of my cl350. Ever since i got the bike it had some top end clatter, but i just rode it and said whatever. Now, under a heavy load or whenever lots of torque is needed (like accelerating from a stop going up hill) I get a nasty knock coming from what I'm pretty sure is the top end. Also, the clatter has gotten worse but its still just kinda of af a metalic "******-*****" humming just aubidly beneath the exhaust. I think there might be a slight loss of preformance, but I dunno if its because of this. But before I go tearing the whole thing apart I just wanted to get some opinions on what could be the problem.