NGK Iridium IX Spark Plug | Stock #3520 (BR8ECMIX)

High-performance iridium alloy spark plug engineered for exceptional durability and enhanced ignitability. Features an ultra-fine 0.6mm wire center electrode that ensures a stable, concentrated spark, quicker engine starts, improved throttle response, and superior anti-fouling characteristics. Like its standard counterpart, it features a unique "bantam" compact overall height and a tapered-cut ground electrode explicitly engineered for applications with limited clearance above the cylinder head. Built with trivalent metal plating for advanced anti-corrosion and anti-seizing performance, a built-in resistor, a non-projected tip, and a solid terminal configuration to resist vibration loosening.

Specs & Details

• Stock Number: 3520
• Part Number: BR8ECMIX
• Thread Size: M14 - 1.25
• Reach: 19.0 mm (0.750 in)
• Seat Style: Gasket (Flat)
• Heat Range: 8
• Resistor Type: Resistor (5,000 Ohms)
• Terminal Type: Solid Terminal (Non-Removable Nut)
• Electrode Material: Iridium fine-wire center electrode (0.6mm)

Two-Stroke Vehicle Fitment

TSO Garage Note: A medium-cold heat range (8) specialized fine-wire iridium upgrade featuring a compact "bantam" insulator height and a solid terminal. The BR8ECMIX serves as the premium high-performance counterpart to the standard BR8ECM (Stock #3035). It is heavily favored as an anti-fouling, high-durability upgrade for late-90s to modern large-displacement KTMs, Husqvarnas, and select Kawasaki two-strokes where the frame or fuel tank leaves extremely limited clearance above the cylinder head. The compact design prevents physical interference, while the solid terminal and tapered-cut ground electrode reliably withstand heavy off-road vibration.