Is this a common issue for bikes with carbies? I haven't heard the pinging noise for years but I think I'm hearing the noise a bit too often on my bike (it has carbies). I say "think" because wind noise is loud and almost drowns it out. It seems to have coincided with filling up using standard unleaded from the BP on Beach Rd. I don't recall hearing it for the previous 670km (filled up twice at my local Shell with standard unleaded).