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I fit Denso Iridium plugs to all my bikes and have never had a problem with them. The Denso ones have a finer tip than the NGK Iridiums and I've always understood that the concentration of voltage at a fine point leads to easier spark generation, such that they can take advantage of a wider gap and produce a better flame. In my experience, fitting the Denso Iridiums is a very good way to get speedier starting, and they seem to last so much longer than fat-electrode plugs that the extra expense is fully justifiable.
Nick
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