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On a waste spark system you should use double platinum plugs. Because the cylinders fire on the compression stroke on the positive side and the exhaust stroke on the negative side, copper plugs would burn out very fast. As an example, double platinum plugs are advertised as 100,000 plugs, but I wouldn't go past 50,000 miles due to the possibility of the plug getting stuck in the engine. The copper plug on the same engine would only go about 15,000 miles. Based on the locations of the plug applications on various vehicles, I would not want to change plugs every 15,000 miles.

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Q: What type of spark plug is used on waste spark ignition?
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