Thinking about this the other day, When my 80SG is on the center-stand the rear wheel is about 75mm, (3in), my 74TXA is 40mm, (1 3/4in), off the ground, ( true reading for the oil level). How much does the hard-tail frame drop at the rear? If the hard tail frame lowers the rear.....say 2-3in from a standard framed XS, that is a drop in the rear of close to 6in to take an oil level reading, (no center-stand), if you leave the front the same it has to be tilting the engine a hell of a way to the back, worse if the forks are extended.
Will that cause the transmission bearings to have to much oil around them as well as starving the big ends?