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The way I understand it, the duty cycle on a pulsed ground FV would be the INVERSE of what you would expect. It would read "on" when the FV was not receiving a ground and "off" when it is receiving a ground. That would mean that your "real" duty cycle for the FV being on is 12%, which holds hands with what everything else is telling you. Easily verified by leaving the meter hooked up and removing the oil tank cap, which will introduce unmetered air into the system and lean out the mixture, so your duty cycle should go "up" (down on your meter).
Regards,
Brian Petry, Springboro OH
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