I'm lending my CBR400 (which I'm building as we speak) to a friend so that he can do a trackday at Cadwell next month, to save me having to buy a pile of sprockets and to save him having to mess about changing them all day, can anyone give me a clue as to gearing for Cadwell Park please?

65 bhp (ish)

I was guessing at 15/41 or 15/42 ???

my NC30 wants 15/43 or 14/41 kind of gearing..

Something like that should see you good..

We ran 2 NC29s round there a couple of weeks backs, one was 14/40 and the other 14/42. The 14/42 was the way forward....both bikes putting out about the same amount of power as you.