Standard OE-approved copper core spark plug featuring a solid 98% pure copper core for enhanced heat dissipation and wider heat ranges. Built with trivalent metal plating for superior anti-corrosion and anti-seizing properties, a built-in resistor, a non-projected tip design tailored for moderate-to-high performance two-stroke applications, and a solid terminal configuration explicitly designed to resist vibration loosening.
Specs & Details
- Stock Number: 3961
- Part Number: BR8ES (Solid)
- 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: Nickel alloy center electrode (Copper core)
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Yamaha | YFZ350 Banshee / YFS200 Blaster | Two-Stroke Sport ATV | 1987–2006 |
| Yamaha | SuperJet / WaveRunner (Two-Stroke) | Personal Watercraft (PWC) | 1990s–2020 |
| Kawasaki | Jet Ski (Select Two-Stroke Models) | Personal Watercraft (PWC) | 1980s–2011 |
| Polaris / Ski-Doo | Older Snowmobiles | Two-Stroke Snowmobile | Select Vintage Years |
TSO Garage Note: A medium-cold heat range (8) standard resistor plug with a 19mm reach and a solid terminal nut. This is the exact solid-terminal equivalent to stock #5422 (the ubiquitous standard BR8ES). While it functions identically internally, the solid terminal makes it a superior choice for high-vibration applications like two-stroke personal watercraft (PWCs), snowmobiles, and large-displacement ATVs (like the Banshee) where standard removable nuts are prone to vibrating loose and causing ignition issues.
Compatibility
Fetching compatibility details...
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