hey guys im probably being paranoid however i started my rb25 for the first time in about 3 weeks let it idle til it warmed up (idled fine and reved fine) when i turned it off i heard a slight rattle wasnt really loud and not sure if it was a knocking sound. it could have been something just rattling im not sure. like i said im probably just being paranoid. if it was a engine knock it would be making the noise the whole time right?