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try taking the air shroud of and disconect the kill switsh wires from the coils and do a continuity from the green wire from the white plug in connector, it should be the wires to the left of the starter. then try to start it as usual. Let me know how you are doing. good luck.
Check the diodes in the wires to the coils. Trace the wires from the coils, and they should join together into a single wire. In the junction of the wires, there is diodes. There is a possibility the diodes burnt out which will not allow power to the coils. My experience was when one burnt out and only one cylinder would run. I replaced the wiring and both cylinders worked fine.
There are lots of possibilities. If the sparkplugs are fouled that can cause a weak spark, carbon residue that can ignite the incoming gas too soon. A plugged muffler is also a common cause, and will happen the most at highest RPM. Cross firing wires can also do it. If nothing else, it could be a burned or misadjusted valve, which a compression test would help determine.
Take off the covers. you will see the magnito above the flywheel. Look to see are the wires going to it loose or is the wire going from it to the spark plug broke. If not try taking the magnito off and sanding down the ends of it. They will probably be rusty.
Hope it helps.
I'm sorry for asking more questions, but doe this engine have points for ignition?? Look for cracks in the wire that may allow spark to jump to ground before reaching the spark plug. Also make sure the kill switch is not activated wile attemping to start the engine. I realize this may be knowledge already known, but I have to start with the basics before proceeding.