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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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