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Questions for 7790 or 920 Diesel Owners

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I've been using mine this spring for rototilling and noticed a couple of oddities----or maybe they're normal for the Lombardini engine. First one is idling. It will idle at a reasonable slow speed and then all of a sudden it acts like it fell off the "cam" and slow way down and then stall out shortly after that. Second, when tilling next to some grass, the exhaust coming out of the muffler deflects the grass--------but not in a consistent fashion or location. It's almost like the engine is misfiring, but it's running fine. Is any of this normal?? Other than the things above, it starts and runs very well. Not burning oil either since I replaced the rings.

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