I've had a Deweze Slope Mower for almost 2 years and have had problems with the new muffler from Deweze $270 burning off the mower after only 5 hours. The flame from the exhaust ports is blue and evidently the carb is out too lean/rich. When I got the low bid in a municipal auction the unit had 295 hours and now only has @302 hrs. The city had rigged a cheap pancake muffler (1) to the two exhaust port pipes. I wanted it quiet before I heard feedback on the excessive noise - sounds like a midlife crisis bike (hog), so I ordered the factory muffler for $270 from Deweze and it lasted 1 afternoon before burning and falling off the mower. I need to know about carb adjustments before fixing this expensive muffler so I can use this beast and probably sell it. New ones are $19000 to $20000. This one is hardly used so I'll get it back to new condition (paint, clean) and sell it off for 9-10K on Ebay. Thanks for helping.