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    Z645 low top end rpm's

    2014 JD Z645, 2300 hrs. The top end throtle speed appears to be down 500+ rpms. Idle is fine. Changed fuel filter Cleaned air filter Seafoam thru carb (never could make it stall) Drained gas & ran 1 gal thru system with seafoam added No improvement Change plugs? (Original)
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