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cracked coils …. your’s are surely not that bad !! but they can fire to ground unded the unseen part …. touching the mag plate.
one thing you should check is presence or absence of sparks the moment it dies on you… loss of ignition sparks would confirm the cause .
if you do have good sparks (test quickly) fuel is likely still the main issue to chase down .
check the air nipple hose feeding air pressure to the side tank connector … make certain it is not cracked.
also check the small vertical hose on the side of the powerhead.
further down the road you may have to ckeck the check valves controlling/feeding crankcase pressure to the tank. they sit behing the intake maifold plate.
if your engine runs a minute it should have been able to build up “some” pressure in the tank …test by openning the tank cap quicly when it dies it should go pssst! as air escapes.
one test you can do after you pushed the primer button and started the engine is to lift the tank above the engine to gravity feed the fuel to it .
btw… did you ever do compression test on the cylinders ??
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