Any motorcycle I've seen that has a yellow 'center' line painted on it (for stropping and loading on ships and gliders) Has the line pretty well in the center of the chain case......Like this NOS Norton case. I think that would be near enough for your purpose! Ron

email (option): ronpier@talk21.com

Turns out weight at the front wheel is 85Kg and the rear is 115 Kg.

Tie a rope around the front & around the back wheels
Tie the other ends to a stout beam
Tie a rope around the beam & raise it off the ground
Slide this rope till the beam sits horizontal.
That is the balance point.
A lot easier to do that it sounds.

email (option): bsansw1@tpg.com.au