Both of you know that the M18 is a magneto, wasted spark engine right?
It uses one mag, and fires both plugs at the same time. The only way for it not to fire on one cylinder is if a wire is bad, or a plug is bad. The wires are built into the mag and are not replaceable.
TRY NEW SPARK PLUGS!!! NOT USED!
Verify spark at both cylinders when its warm first. I doubt it is the mag, since it runs fine cold, and only appears to miss on one cylinder.
It sounds like the missing cylinder is the left one. Do a compression check on it with the motor hot. I think you will find that once warm, the compression on that cylinder will be lower than the right. Adjust the valves and see if that helps.
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