Mate, I've said the same on the RGV forum myself to Sam (from BDK) see here but trust me, that FZR is properly quick. It's a good match for the ZXR's and their 80 odd bhp is not in doubt.
Dean (on said FZR) beat 4 RS's and a TZ in the Open, only Dan (on his RS), MJ and a young Stuart Mitchell (on an RS125) were within 15 seconds of him come the chequered flag.
I'd read all the posts on the RGV forum with guys moaning about them (all the "400" diesels), heard Bill complain and even seen Leighton (in VJ23 era) on TV being shot to bits by them, however nothing but nothing prepares you for them, they go more like 600's than 250's.
I know Wayne was blown away by their speed.
And that modern 1000 that makes 180 bhp will do it year in year out, no one is claiming these 400's don't need a rebuild every year or so which is probably going to be around 1500 miles at the most.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread