Hate to say this but I think the Barber museum got their specs wrong! I had one of these. The 1991 Trophy made a claimed 125bhp at the rear wheel and I was clocked by a police patrol car at 140mph on one! Needless to say I was walking everywhere for a while after that! The stats Barber quote are for the later twin headlight models which was tuned for lower BHP but fatter torque curve I believe.
Motorcycle Photo Of The Day 
Hate to say this but I think the Barber museum got their specs wrong! I had one of these. The 1991 Trophy made a claimed 125bhp at the rear wheel and I was clocked by a police patrol car at 140mph on one! Needless to say I was walking everywhere for a while after that! The stats Barber quote are for the later twin headlight models which was tuned for lower BHP but fatter torque curve I believe.