Hi Dave Hi all
CG kickstart shaft is 16mm - on the parallel section behind the splines and the two I have are 15.7 and 15.9 on the splines.
Now as an aside and a high level of serendipity whilst fiddling about looking at this I thought - are these different from the Yam ones I have - and a TZR 250 kickstart lever fits really well on the CG shaft - so much so that the kick start now tucks away real neatly and does not scart the silencer on the way through. This also suggests that RD500, RD250, 350, 350LC and 350YPVS amongst others will also fit. Took CG lever back into shed and in passing offered it up to the TZRotax - and it does not hit the frame on its swing if I centre it on the kickstart splines - which are about 25mm so the CG will not fit, however if I turn the boss spindle of the Rotax one down a couple of mm the CG pedal will fit the boss, and the design of the CG pedal means it will work left handed if I carefully file the Rotax boss. So your question may well have answered two of my problems - thanks.
R