If the relevant service sheet tells you the required degrees of maximum advance, or inches/millimetres before top dead centre in terms of piston position,then it's not hard . . .About 32-34 degrees (5/16ths?) is probably close, but don't take that as gospel.
Put pistons in said position turning the engine in the normal direction of rotation to get them there, using timing disc on the crank, stick down plug hole or whatever. If the Hunt thing is a 'dead spark' magneto (ie fires both plugs at once - I think it is from what little I have read) then no need to worry which cylinder is on compression.
Set (correctly adjusted) points on mag to be just starting to open (turning them in the correct direction!). Mount the drive pinion and ATD, with it in the advanced position - ie held fully open against the springs with a bit of wedge-shaped wood or whatever. Carefully do up the nut - without letting the mag or engine setting move anywhere. (A good idea to check before-hand that the nut runs up its thread easily all the way.) The taper should grab the pinion quite quickly and easily. Tighten nut, and then check complete setting again before putting timing cover etc back.
If the gods are with you, the pinion should stick on the taper, the mag won't move, the pistons won't either, and you'll be ready to roll. Don't forget to take any wedges out of the ATD . . .
If it's not a dead spark magneto, then it's possible the plug leads will end up the wrong way round. If you have sparks but it won't go, or makes embarrassing noises, swap 'em round. I don't know how the points' positon relates to the HT leads on a Hunt.
Good luck and hope you roar into life asap.
