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Sounds like maybe ignition problem with weak spark or an intermittent electrical issue loading down the kill wire to the ignition.

You can find an online engine service manual for it here:

Kohler Engines: Magnum: Series Landing: Engines

You might find a Gravely online or paper manual for it here:


Ariens Order Owners Manuals

Looking in the engine manual there is a single coil that feeds both plugs. So if nothing seems to be shorting out the kill line into the coil (wire shorting against the frame, bad relay, bad safety switch, etc), the coil would be my guess as the culprit.

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