Hi all. Just inherited bike from my father in law. Last time he rode it, it was leaking fuel.It has sat, outside, for many months, probably 6 months. not started. was told leak was oring in manifold exhaust. replaced that. Wont start now. Think gas was bad. drained out, put new in, still wont start. is there a fuel filter that needs changed or lines need cleaned? not much experience working on bikes. none actually... thanks