How to adjust ignition timing kohler engine?

Need to set ignition timing kohler k321s engine|||the timeing is set at the crankshaft, an camshaft do you have it tore down? their are demples to alighn the gears. do you need to replace the pionts? piston should be at top dead center. piston at the top, both valves closed, install points, re gap contacts ,thickness of a standard business card|||The only adjustment to the timing is internal,with alignment marks on the camshaft and crankshaft.|||The points should be set to .016 -.020". There is no other ignition timing setting.