Well, I was mowing underneath a cluster of very large white pines the other day with my 60" Turf Ranger (completely eliminating the need for trimming underneath - hehe - try that with your Z) you know, sticking the deck way underneath, reversing out, repeating, etc.
Low and behold, about 30 seconds later, flames shot up in front of the Kohler 20. Couldn't tell what was going on at first but needless to say I was running scared...
Seems as if the mower "pruned" a dead white pine stem about 18" long with two or three tufts of dead white pine needles attached and the muffler had ignited it. It was burning right there next to the rubber fuel line. I estimated I had about 5 seconds to react so after shutting down the mower I jumped off and found a small section of not-yet-burnt stem to grab and toss away from the machine. Net result: no damage.
O.K., O.K., I'm trying to figure out what the moral of the story is....any suggestions?