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E3 spark plugs for automotive and powersports applications have a unique multi-leg ground electrode that is pre-gapped at the factory to meet the O.E. requirements for the vehicles they are listed to fit. No further gapping is required.
E3 lawn & garden plugs are gapped at the factory, but may require some adjustment to meet your O.E. engine requirements.
If it is necessary to widen the gap, do so with a tool that only pulls back on the ground electrode without touching the center electrode or the porcelain. To close the gap on a plug, gently tap the plug, electrode first on a hard surface.