Remove the control panel from the front of the genset.
Inside, go to the coil.
Remove the small white wire from the coil, and remove the spark plug wire from the spark plug.
Set your meter to ohms.
Place one meter lead to the tab on the coil that you removed the white wire from.
Touch the other lead to the screw holding the small black wire that comes off the coil.
It should read 0.5 ohms.
Now place one meter lead into the spark plug wire, and the other lead to that same screw.
It should read 1,100 ohms.
If either reading are out of spec, the coil is bad.
Now set the meter to VAC.
Connect one lead to the small white wire you removed from the coil.
Touch the other lead to a clean engine ground.
Press and hold the start button for 5 or 6 seconds.
At cranking speed, you should see between 15 and 50 VAC.
If you do not, the magneto is bad.