Found the issue with the missfire, as it occured again at the Barry Sheen Festival at Hampton Downs in Oct 2012, - water in the ECU box was the issue. There are two small air vent holes in the old-school ECU's , and these are big enough to let water in - and cause the intermittent running.
Fitted Metzeler slicks for the barry Sheene event also - and we went slightly quicker on those than our previous best on the bike, although having the aussie contingent there helped with the motivation as well.
Next thing is to fiddle with the seat / bar / footpeg position on the bike to improve its turn in and balance.
GW
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