FWIW: the timing is not adjustable on the Mag 18, although the older KT's have points so there is some adjustment using point gap variation.
While checking flywheel key's is always a good thing, Mag.18's rarely have that problem, but I would look at the magnets on the underside of the flywheel, as frequently because of the ageing now, the attaching glue tends to loosen which can and does cause CHARGING problems.( but not spark)
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