I recently purchased a used 1999 Honda shadow vt1100c3 aero, and I´ve been riding it, the only thing that bugs me is there is a ticking noise at the top of the engine, I talked to a mechanic over the phone and he said it was probably just stuff getting caught in the valves, he then told me to buy some marvel mystery oil and let it run, will this solve it or could it be a really serious problem.