I weighed my bike using normal bathroom scales, one at a time under each wheel. Not the most accurate way but gives me a good indication of the final weight. The tank was empty and the fairings weren't on (just the seat) and it came to 161.kg. One litre of fuel is about 0.7kg and I need 2 in the tank after a race in case I get fuel tested. So lets say I'll have 3 litres just to be safe: 2.1kg. I'd say 4kg is an overestimate of the fairing weight so I should be about:
161.1 + 2.1 + 4 = 167kg
With 94 bhp I need the bike to weigh 170.5kg
So i'm going to be close to optimum.
I've also decided to vinyl wrap the bike rather than paint it. I've started the seat unit, and its pretty rubbish, but i've got the hang of it now and will probably do it again once i've done the fairings.