So anywho been riding the bike every weekend since I got it LOVE it. But noticed something interetsing. When I fill it up with gas, i get this like extra little rattle noise that sounds like it's coming from between my legs when i'm either hard on the gas or going over bumpy roads (lots in ca). But after say 20 mins of riding it goes away. Does anybody else have this? It sure got me by suprise the first time.