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Greetings. Can anyone advise if I would improve starting on my '50 Comet C (standard 6 volt magneto) by using an Iridium spark plug? When I bought the machine it was fitted with an NGK B7ES for which the equivalent NGK Iridium plug is a BR7 EIX. I read that these plugs need 5000 volts less to spark. If not recommended what plug would you suggest.