Thanks to all who replied. Took the bike out to warm it up and it is running fine again. Bern came over and we checked it with the Twinmax and it was as near as perfect, just a small tweak needed. So you can get it right with the Carbtune, but I can see that the Twinmax is more sensitive and quicker.The advice to use the Carbtune upside down comes from the Morgantune website and specifically mentions R series BMWs as having lower vacuum.
Hopefully Bern has recovered from the close range Stebel Nautilus horn demo.......
Regards
Roger
Advice needed
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