Iridium Power Spark Plug

The Denso IU31 Iridium Power spark plug is engineered for enhanced firing performance through its advanced design. It utilizes a 0.4mm iridium-tipped, laser-welded fine wire center electrode, which requires less voltage for a stronger spark. The U-Groove ground electrode, featuring a taper cut shape, further boosts ignitability while minimizing quenching. Constructed with precision, this spark plug includes machine-rolled threads to ensure smooth installation and removal without cross-threading or seizing. The insulator is made from purified alumina powder, providing exceptional strength and superior thermal conductivity, while its five-rib design effectively prevents flashover. A copper-glass seal ensures a gas-tight connection between the center electrode and the insulator. Key specifications include a 10mm thread diameter with a 1.0mm pitch, a gasket seat type, and a 19mm reach. The hex size is 5/8" (16mm), and it features a removable nut terminal type. The pre-set gap is .035" (0.9mm). This plug is also a resistor type, with a value of 5k Ohm, and has a heat range of 31. Torque specifications are provided for both cast iron and aluminum engines, recommended at 7-11 lb. ft. While classified as an automotive part, the available fitment data indicates applications primarily in powersports, specifically for the Suzuki DR650SE Base model from 1996 to 2007. No automotive applications are currently associated with this part.