Well Mister Buccaneer here is my two cents on this question. Back when I was racing snowmobiles we ran the points a little wide. Wider points make more advance. Narrower points retard timing. Those old motors didn’t care much. Can you put a dial indicator in the spark plug hole and check where the points break? Your new coil might be sparking at a different spot than the original one. At start up you need about .020 thou BTDC to get you going. A dial indicator and a continuity light should tell you where the points break.
dale
