I have 2 work colleagues trying their hand at racing for the very first time.Both have been doing trackdays for a couple of years on R1's. For classic racing they're using cheap '87ish FZ600 aircooled.After sorting out the jetting,they're putting out 57 and 58 rwhp.
Only exhausts and rear shock may be changed and on 16" wheels too.
Should be good,now where are my thermals
Mark.