Pgo 150 intermittent issue

[Jgerv]

Alright I have a 2006 genuine blur 150 (pgo 150). I have an issue where it cuts out after warm and will sometimes stall when it comes to a stop. It will run fine and reach top speed/rpm cold and then cuts in and out when warm. I replaced intake and gaskets, adjusted valves, went through carb. When I replace the spark plug the problem is fixed for 20 miles and then starts again. Coil pack, stator??? It has to be a spark issue. Fuel is getting through the carb and carb is clean.