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  1. Nutball

    Ported 590 not starting, BADLY want to fix at-home!

    Is the spark plug and decompression valve tight?
  2. Nutball

    Ported 590 not starting, BADLY want to fix at-home!

    Did you take the muffler off and check the condition of the piston? The 590 can developed a leaky check valve in the main nozzle that can cause unsteady and lean idling.
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