Well, i finally got around to checking the valve clearances today. The intake left and right were both 0.10 and exhaust left and right were both 0.20. I know this is on the minimum tight side which i hope is ok? but as they expand as they get hotter i cant see that its the valves causing the ticking. I also checked the ACCT which is in gread order as well as the cam chain which seems to be adjusted nicely and correctly. So, after reassembling i fired her up and all sounds perfect until after a 5 mile blast to get things nice and hot and hey presto, ticking like a bomb. What sould i check next guys?