BHP Reading of the Dyno

Right i've had my 750 dyno'd with a race filter/ Runs sweet as anything now lol! However the Dyno read out was 66BHP which as it was on the rolling road was at the back wheel. Am i right in thinking the standard BHP (also 66) is read from the fly wheel? If thats so which i'm confident it is, do any of you know the ratio for these bikes in terms of what is roughly lost through the transmission...? I was thinking it cant be far away from the 900's power when standard?

Thanks for any reply's

Luke