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Plug wires running too close to each other may cause "cross-fire". That is when the wire next to the one firing fires through induction at the same time. If you are running a high output ignition keep the wires an inch apart - at least.

Retarded ignition timing can also cause the exhaust to pop.
Make sure all the plugs are gapped the same; I found that my engines like a small gap (.030") Some have better luck with large gaps (.040" to .060")
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