I took a large Phillips screwdriver and punched a hole in the spark arrestor and immediately noticed an increase in performance. I also suffered to failure of the secondary clutch, had this repaired, and they noticed I had the wrong drive belt, the replacement of both of these items made a big difference. I have never experienced a slow down on our 2017 like you are describing, so I am GUESSING a belt or clutch problem.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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