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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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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