G'day Bob.
As TT said 1,1/2 out is the starting point. Depends on the state of tune, pipes, air filter (or not) and size of carb.
On my A7 with a 32mm Mk1 it's 2,1/4.
It's really a trial thing once the motor is up to operating temp. At idle wind out 1/4 at a time, let it settle and give a few blips. Do this til she starts to 8 stroke then wind it back till she falters. Half way between the two should be just right.
Cheers