96 t wolf problem

[JimandJacki Cariolano 0]

Hello to the group, I am working on a 96 timber wolf. Runs great until it gets good and warm then starts missing and puffs smoke and dies. Plug then is black and sooty. Clean plug and let it cool and then it runs fine again until it gets warm. Engine has decent compression, carb it clean. What am I missing?

[MarkinAR 123]

So black plug would be flooding which could be flooding or reducing spark.  Could be packed exhaust, needle valve and seat leaking, coil shutting down with heat, lot of options.