Fram XS3924 Autolite Xtreme Sport Iridium Powersports Spark Plug

The Autolite XS3924 Xtreme Sport Iridium is a performance-grade powersports spark plug engineered for motorcycles, ATVs, snowmobiles, jet skis, and boats. Built to withstand the extreme combustion temperatures of high-revving powersport engines, the XS3924 meets or exceeds OE design standards right out of the box.

Key Features:

• Iridium-enhanced 0.6mm fine-wire center electrode for superior ignitability, faster fuel combustion, and a more focused spark compared to standard plugs
• Sport V-trim tapered ground electrode with platinum tip for improved ignitability, smoother starts, and consistent long-term performance
• Mid-projection fine-wire design delivers a sharper, more precise spark with virtually no gap erosion over the life of the plug
• High-alumina multi-rib ceramic insulator provides excellent thermal conductivity and superior insulation for durability under demanding conditions
• Copper core center electrode aids in heat dissipation and improves fouling resistance
• Up to 26% quicker engine starts than standard non-fine-wire spark plugs (independent lab tested)
• Up to 21% fewer hydrocarbon emissions than standard plugs, promoting better fuel efficiency and horsepower
• Built-in 4,000-ohm resistor suppresses ignition interference
• Meets or exceeds OE design specifications

Specifications:

• Thread Diameter: 14mm
• Thread Pitch: 1.25mm
• Thread Reach: 19mm (3/4 in)
• Hex Size: 5/8 in (16mm)
• Seat Type: Gasket (Flat)
• Preset Gap: 0.044–0.045 in (1.1–1.15mm)
• Center Electrode Tip: Iridium, 0.6mm Fine Wire
• Ground Electrode Tip: Platinum, Taper Cut
• Resistor Value: 4,000 Ohm
• Heat Range: 3
• Terminal Type: Solid (Non-Removable)

The Autolite XS3924 is sold individually. With a proven design that combines iridium durability with platinum ground electrode technology, this plug delivers reliable ignition performance across all seasons and riding conditions.