I believe the coils tend to overheat when the motor is run without the lower cowls. I’ve heard that John Deere Pony motor coils work, with some modification.

Ah’ the ole Lauson twin coil conundrum comes up again. What John C said is true. The new coils that are available on e-bay are for maytag Model 72 twin motors and are very good , and very expensive. Two styles are offered , be sure that you get the one for your mag, either Eisemann or Wico. Another option that I know works, I GLC member did the conversion is to use a John Deere pony motor coil. These are also available on ebay or your friendly neighborhood farm implement dealer. I bit of modification to the armature lamination is required to fit the smaller bore of the pony coil.
As for the melted coil on the Lauson, that condition is commonly encountered. The cause, I have heard is either running a low idle for long periods or running the motor without the lower cowling installed.
Joe B

To check timing, first set points to 0.020" and clean, remove one cylinder head. Turn crankshaft over slowly clockwise until breaker arm just starts to open. At this point the piston should be 5/32" from the top face of the cylinder.
If ignition is out of time, loosen the two screws holding the magneto starter in place. Move the stator assembly right or left until the points start to open with 5/32nds from the top face of the cylinder. Tighten the two screws. Be careful and you can reuse the old head gasket. I don’t know where you can buy a new one if your’s get broken.