I got chainsaw duty during long yellows and after the race. Had problems with the moror cutting off after running a few seconds. Found that the air filter was clogged with saw dust and that also caused the spark plug to foul badly. I am down to only two more pine beetle infested trees to cut up and put under clear plastic to solarize those critters.
Ouch! That hurts. Smoke smunches the rear end.. dang.