Dont worry Steve im not going to tinker with the valve clearances,im going to check and adjust IF needed to the maufactures spec and my warranty will be fine because i wont tell them.Dont no how your going to explain the hole you drilled through your baffles though,thats why i got the cobra back box,my original box is as new so i can pop it back on for when it goes in for service and if they ever start doing emmisions on the MOT.My tappets arnt bad by any means ive just got a trained ear so im going to check them for my own piece of mind.Take care out there mate,its bloody freezing,wish i had heated grips,but summer will be here soon ,right!!!????? Take Care Mate DSL