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I have been trying to tune my yt6800 that I received for free. It starts up nicely and runs but under load it starts to backfire. I have tried to adjust the carb with the 2 adjustment screws on top of the engine but they do not make any difference. I changed the fuel filter thinking it might be clogged. It was dirty but that again did not make any difference. I would appreciate any help.
Thank you.
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