we run on a similar length straight on carpet at our local club.
gearing varies a LOT between motors, with some below 5 and others up around 6.
I've run a speed passion 13.5 there on a ratio of about 5.1
It also depends greatly on the speedo that he's got, the newer 'dynamic timing' ones mean you gear a lot higher (6 or even 7) and let the speedo change things around.
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