I have a 09 xb12ss with 6200 miles on it. Lately its been making a weird vibrating noise which sounds like its coming from the front. It does this at idle when first started and occasionally afterward. Sounds like something is loose but I can't find it. Bike runs and shifts like new. Anyone ever experienced this or have any hints in which direction to go? I don't want to put it in the shop but will if that annoying noise continues.