First time at Circuito de Cartagena on 78 Z650 lot of fun!!. Next year want to do some races if money allows me. (This year put a lot on my 77 Z1000)
I need loss weight, racing seat, cams, and 18x2.15 front wheel to cacth 110/80/18 Avon AM22. Probably Z1R wheel.
well, if you are going to run in the 750 class anyway, you might as well go full 750......
my racer was built around a gpz750 with a 810 wiseco kit, but even if this season has been my best (finished second) it wasnt really a match to the better open class bikes (up to 1100)
you have indeed to check your regulations. if the 750 class has a cut-off of 1979 (before 16 valve CB750F/GSX750 ) then a 650/750 will be very competitive. it's a much better bike than sohc750 GS750 . IMHO
here the 16 valve 750 have to run in open class as 750 max.