This may help.

With the motor at TDC (all valves closed) and the cam sprocket removed everything should align something like this...



Note the notch on the decompressor shaft is at about 11-12 o'clock, the camshaft notch is at 12 o'clock and the lobe on the inner end of the decompressor shaft should be facing the front of the bike. (Make sure the lobe is engaged in the slotted part of the decompressor pin).

__________________