My gpx has approx 130km on the clock so far, and when its started from cold, I can hear a metallic tinkling kind of noise. It sounds like there are bits of metal doing laps of the engine or something. (I have very little knowledge of engine mechanics, sorry) It goes on for a few minutes. Its been down to the dealer for a look, but as it was ridden down and warm, the sound wasn't being made. I do plan to leave it overnight at the dealers when time allows. Any ideas ?