This has happened twice now on my old Wal-mart Yard Machine... I completely mow my yard.. turn off and a small fire starts coming out of the exhaust pipe..
At first I thought maybe old grass was in the cover or muffler , ( The cover with all the holes in it attached to a 3/4" or so, exhaust pipe)... It is all rusted out.. I looked again and the flame is definitely coming from the 3/4" pipe.. No Grass... So I'm guessing it is a build up of gas that can't burn because of the exhaust shooting out carbonioxide with little oxygen to fuel the flame.. Plus the air compression.. But that is just a guess..
What can I do to repair this and keep these fires from happening..?