09 Xt660X fuel cap
 

I seem to have a problem with my fuel cap, when I bought the bike I noticed that it was pretty loose. But the bike ran well and it never leaked fuel. The cap is now vibrating that much that it�s really loud, and I�m thinking that it might start leaking soon. I have taken it apart, checked the internals and then put it all back together but the vibrations still persist. Has anyone had this problem?