I will add to the discussion that the function of the carbon resistor wire is 2 fold. TO increase the spark voltage a little (9000ohms per foot of wire), which makes a little more energetic spark at the gap, and to prevent the wire from being an antenna for radio waves. THIS is more of a suppression by conductor wave propagation than a absorption of energy. The resistive element mentioned by John is sure involved, but not for suppression of RF. Magnetic suppression wires are real copper or stainless wire wrapped around a stranded Kevlar or glass fiber core. These have the near zero resistance of a solid wire (they are a continuous conductor) and the winding of the wire in a coil suppresses the RF noise. A single (to me most important) issue with carbon wires is that they deteriorate and can/do become near non conductors in a way that can put far more resistance into the circuit than 10 000 ohms or so. 40 000 ohms can cause coil failure and cap/rotor failure from no place to send the spark. as it fails, the tractor still runs well, but the mag (or coil for that matter) is being stressed. Neither Magnetic, nor solid wire have that issue if kept in good condition. Jim
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