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I have a 1972 M817 which apparently shuts down by way of a dash-mounted handle/cable that shuts the fuel off. I previously had a 1978 M817 which did not have this feature, and I shut it down by turning both the Battery and Run switches to the off position. On the 1972, even if I turn off both switches the rig still runs without a hiccup, until engaging the fuel shutoff. Does anyone know which method is better, or why the 1972 would still run with both switches turned off?