I haven't seen anything with a flywheel magneto system in lawn care equipment that spark more or less than 1 spark per rpm. The Briggs 4 cycle engine with magneto ignition are wasted spark setup otherwords they fire the spark plug on both TDC compression (actually about 15-20 degrees before) and on the exhaust stroke making them firing once per rev. Of course they don't produce power on the exhaust stroke but can produce flame out if there is a miss fire on compression. I had one Kawasaki that nearly burned my leg on miss-fire by shooting a one foot flame plus made me jump from the report. Even the v-twins with two coils will still be the same setup.
I think the only time you are going to need the other settings is if things are driven off the camshaft or in the automobile that using a single coil and a distributor where you are sensing the coil wire before the distributor cap.
On that generator I am assuming you are using 50 hz so the off load speed should be only slightly higher than 3000 to produce about 51hz (3060 rpm) as generator have slight governor droop from off load to full load.
As 12K being high it might be right as the chainsaws I work on can be as high 14K depending on the make and model.
