check the bolts there are long ones and short ones if you have a long one in a short hole you will have a rattle
check fender and cowl
A friend with an 04 had this exact symptom. One of the 4 front Cowl bolts was missing! The whole cowl was rattling whenever he went over a bump. It sounded worse that what it was. Made him think his front suspension was broken...:agree:
The missing bolt is $5 and went under the cylinder head down almost at the bottom of the cowl near where the engine guards go around the valve cover.