. . . .a 53.6 lap of Brands Hatch Indy circuit on that though
on a production bike?
Yup, 1998 Suzuki GSX-R750, with Pirelli Diablo Corsa tyres. I was running 54.5 second laps all day and I couldn't get the hang of Graham Hill bend, which was slowing me a lot. Finally got it right on my last session. The tyres were pretty shagged though
My 2004 GSX-R750 was lighter and more powerful but I never really trusted it as much - it was "twitchy" and I never went below 55 seconds on it. I was faster on it at Snetterton though.
They were great days but knackering - the ride to Snetterton aout 130 miles, all day track session, then 130 miles home again.