Honda MC systems are based on the open system as shown in your diagram. As John T points out, the onlyt ground path is the electrode in one plug, through the head aluminum, to the other plugs ground electrode then center electrode, then back to the coil other winding. In fact there is only one winding in the Honda coil with plug wires attached at each end of that winding, whereas your diagram has a connection between two windings (same reality). There is no reason I can think of that would preclude the use of two coils on one set of points in a conventional setup, that is with the center connection in your diagram connected to the points as the primary is connected to the secondary in a "normal" ignition coil. This would allow the ground circuit to be established with one wire off the plug and not grounded. This might also explain why the removal of the non operating (fowled) plugs wire might allow the other to operate due to opening a shorted secondary. Just thinking. Jim
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