This ticking noise began last week, the same day after I filled up & within a few hours of doing so. I have since gone through a few tanks of petrol. Here is a video of my bike (Well, the sound at least [media=youtube]D5fR0sKLpbM[/media] Others have similar sounds but mine is nowhere near as bad. I think it is coming from the top end. It can almost be heard travelling through the exhaust. The exhaust note sounds different, as if there is a corresponding sound to the tempo of the tick that sounds labored, almost. The noise does not disappear, get any better or worse whether the bike is warm or cold. This was filmed cold. As for the bike's performance, it seems fine. The same power is there, gears are changing ok for a 85,000km old clutch. But not half as loud and when revving, it cannot be heard above 2200rpm. I watched a cam chain tensioner adjustment video. I attempted this but the bolt into my CCT is an 8mm round head with no groove for a screw driver. Worse, it is seized up BADLY. I cannot make it budge.