Thank you Weld.....
Just popped in and gotta rush off again so will be back later to reply properly but in answer to the gearing thing, I am running an 11" kart rear tyre instead of a big bike wheel and this will bring the gearing right down to something nearer the norm. We are pulling about 60MPH on the long straights at tracks that are about 1.2km all the way round.
It's a 200 which is the displacement limit for a 4 stroke in the regs. 85cc for a two stroke.
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