My new 900 custom at 1200kms has just developed a tick sound that occurs when I open the throttle and release it. It appears to be coming from below the forward part of fuel tank. It's something similar to a butterfly snapping on a carb. I just had my first oil change and check and the mechanic seemed to be unconcerned. But as it has just started, I wondered if perhaps someone else has experienced this. It is quite noticeable.