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The Autolite Xst3926 is a set of iridium-enhanced spark plugs aimed at small outdoor engines such as lawn mowers, trimmers and other lawn and garden equipment. Autolite claims the fine-wire iridium center electrode gives quicker, more consistent starts than standard copper plugs, and the yttrium-enhanced ground electrode is built to hold up under high heat and pressure. The multi-rib ceramic insulator is there for thermal conductivity and insulation. Against basic copper plugs it offers longer service life and easier starts; against premium platinum plugs it sits in a similar price and durability class, with iridium's edge being a sharper, more reliable spark.
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Lowest price we've seen: $5.99 on Nov 10 at NAPA. Tracked across 1 store since Nov 10.
The Autolite XST3926 Extreme Start is an iridium spark plug set for outdoor equipment, including lawn and garden machines. It is a performance-grade, resistor-type plug.
The fine-wire center electrode is iridium-enhanced and starts the engine 26% quicker and more consistently than standard copper plugs. The ground electrode is yttrium-enhanced to transfer heat well and hold up under high temperatures and pressure.
The insulator is a high-alumina, multi-rib ceramic that conducts heat and insulates well.
