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Briggs spark problem.

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16 hp horizontal Briggs, new piston/rings, points/condenser, .010 air gap on mag, points at .020, perfect timing marks. When I engage starter, I have spark until starter reaches full speed, then spark ceases, when key is released, starter stops, and engine rpm slows, spark shows on plug again. I've tried points at .010 and .030 and it makes no difference. At just starter speed points can't be bouncing/floating. Any ideas?

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