i have a 2000 r6 that i jsut bought. within the week that i bought it there was a knocking/ ticking sound in the front end of the engine just under the gas tank. i was told a that is was probably the the cam chain was loose and i needed to tighten it. but then i was told by someone else that you cant tighten the stock chain, its a self adjusting. what should i do about it and how do u replace it? i wanna save money and do it myself, and if i have to replace it i want to put a self adjusting chain tensioner on it. is it hard to replace or should i take it in to have done? were do i find directions on how to do it myself?