I think that the 23 ft-lb figure is for the M8 bolts which are used on the later version "clutch carrier" design. I seem to think that the proper figure for the M6 bolts would be in the 15-16 ft-lbs range, someone may likely correct me - I've got to figure this out eventually too as I've got a 78 R100 that has the similar older-style clutch, too.