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Bayou 250 intermittent spark

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So I picked up a bayou 250 for cheap, ran great, smoked real bad. I did the top end, rode it about an hour and it stalled and wouldn't start. It would fire once occasionally, but wouldn't keep running. Figured out it wasnt a fuel issue, so I checked the spark. When I pull it with the recoil it has decent spark, but if I crank it with my battery charger with the engine start function, it has no spark. So whats happening is it only has spark if you spin it slowly, but if it spins faster, it loses spark. The crankshaft sensor is good according to my ohm meter, and I visually inspected it, I swapped the cdi box and coil off my 220 with no change. Grounds appear to be good, haven't seen any issues with the wiring

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Unplugging the voltage regulator doesnt cause any changes so I think that would eliminate any issues with the stator and regulator. What else could cause this?

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