Matt,
There is an ongoing debate about this subject. The people who sell the so called high performance( resistance) spark plug wire will tell you that it is superior to the kit supplied wire. If you have access to a good ohm meter you can answer the question yourself. Test an equal length of copper or metal core plug wire with ANY resistance wire and you'll see the difference. High performance plug wire is designed for automotive use or engines having a high voltage ignition systems. The Chinese 2 stroke ignition is not equal to these systems and added resistance between the voltage source, CDI, and the plug will have a negative effect on engine performance. Resistance equates to lower voltage at the plug and I don't care who says different. Lower voltage at the spark plug electrodes equates to a weaker spark. Now, lets look at the RF interference problems with electronic speedometers. Yes, in some cases, depending on the quality of the speedometer in question, a resistance spark plug wire might help with the problem. And, if your engine is running in good form and you have the correct fuel mixture and your plug is not prone to fouling due to worn rings or cylinder walls, you can run the resistance wire with little to no noticable effects. But lets stop foolling ourselves with claims that "High Performance" spark plug wire is better than a good copper core wire for these little engines. It just ain't so. I will continue to maintain that most ignition ills with the Chinese 2 stroke engines are due to the kit supplied spark plug and loose connection at the boot and the plug. A quality spark plug and a good automotive plug boot with a proper fitting terminal will fix most of those plug related problems. The other problem is poor wiring connections at the CDI, engine wire terminals. Get rid of the plug in connectors, solder the connections and insulate with heat shrink tubing. Eliminating bad connections will put you ahead in the performance department. Anyone care to argue with me?