Taking in account all the responses on here , I would boil it down to this then. If everything is "new" and assuming it was made correctly and adjusted correctly, probably no advantage either way as far as wires design. Since we all know that isn't "real world" and we all know they are not made equal quality and all start deteriorating the day after they are born (plugs and wires both) , and once is probably all a hobby/collector tractor will ever get, then I would summise that a solid copper core wire and plug combination would be the best value and sustained carefree performance and that an aged /weathered set would probably show a performance/ reliability advantage between the two types. Now I'm not sure this difference would show up any more on a mag as apposed to bat/coil ignition. All indications say it would be equal. That leads me to believe that the mag/solid wire concensus may come from the fact that mag tractors are older , used less , neglected more so any of them that were ever fitted with "new" carbon wires/resister plugs for whatever reason probably have a marginal path to the electrode by now even tho they may look new yet. Like one poster said, and I believe it , a solid copper core all the way to electrode would work fine even with no coating and in the rain as long as kept away from metal whereas a broken down carbon core will resist so much the current will leach out and find a new easier path. Guess that's all folks.
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