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Hi, Well, there is an issue with metal migration between the contacts on the points, if you have NOS points, that is. I have newer carbon faced points in all my older machines, and they don't care about battery polarity. The other thing is the way a coil is wound. These are what's known as 'autotransformers' which have nothing to do with automobiles, despite the name.:-) That means that the primary (6v) coil windings are shared with the secondary (high voltage) ones. The way it's wound, the negative side would be at the one end of the coil and attached to a lug, while the positive side tap (which is further up the coil) is attached to the case. The high voltage connection is attached to the other end of the coil. Now this doesn't mean a whole lot, but by reversing the battery you now have less effective turns of wire in the secondary. That will lead to a reduction in spark voltage and you might run into plug fouling or other such problems. I wish I could draw a diagram, as the text description really doesn't make this very clear. Of course, there were also negative ground 6v coils in the world, so it's possible that the original modifier swapped the coil out and all this would then be meaningless. Stan
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