Comer S60 max rpm & sprockets?????

[knighty]

Hi Folks - I'm running an old Comer S60 for my son for practice at Tilbury and I'm wondering what the max rpm of the older S60 is supposed to be???.....I know the newer W60 rev to 12,000.....but I suspect the older S60 does not, probably due to the old box exhaust......I also notice that in the early 90's there were only two sprocket sizes allowed, 80 and 85.....which I think is quite smaller than what people run on the W60.....were the S60 sprocket sizes generally smaller "back in the day" which I now understand is pre 2003!!

I'm currently running a 94 tooth sprocket which is probably why he keeps spinning it!!!.......have just fitted an 86 tooth, lets see how that goes, but would appreciate knowing the S60 max rpm.