Thanks for this Ed, you make a good point which was previously overlooked. If you read post 24 you'll learn that I finally cured this annoying and illusive problem. The culprit was an alumium engine mount (supplied with the WildCard kit) which was transmitting engine vibration through the airframe and aerating the fuel (despite the tank being padded with foam rubber and using an anti-foaming fuel additive)

Simply changing the engine mount for my usual cheap plastic one cured the problem and transformed the engine's performance as well as its reliability. To say I'm pleased is quite an understatement as this problem dogged me all through the summer!

Tony