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I thought throttle being fully open would create less of a vacuum in the intake manifold allowing the engine to turn easier and hopefully giving sufficient RPM to work the governor?
But with the throttle fully open the pistons have to compress a full charge of air on every compression stroke.
So its "6 and a half dozen" then if you leave the throttle open the compression stroke using more energy to compress, close the throttle and the intake stroke takes more energy due to the vacuum?