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 high-output cold-weather or high-revving applications, a factory pre-gapped 0.8mm / 0.031" gap, and a solid terminal configuration explicitly designed to resist vibration loosening.
Specs & Details
- Stock Number: 4677
- Part Number: BR9ES (Solid)
- Thread Size: M14 - 1.25
- Reach: 19.0 mm (0.750 in)
- Seat Style: Gasket (Flat)
- Heat Range: 9
- Resistor Type: Resistor (5,000 Ohms)
- Terminal Type: Solid Terminal (Non-Removable Nut)
- Electrode Material: Nickel alloy center electrode (Copper core)
- Factory Gap: 0.8 mm (0.031 in)
Two-Stroke Vehicle Fitment
| Make | Model | Engine Type | Year Range |
| Yamaha | YZ 125 | Two-Stroke Motocross | 1990s–Present |
| Honda | CR 125R | Two-Stroke Motocross | 1980s–2007 |
| Ski-Doo / Polaris | Various Liquid-Cooled Snowmobiles | Two-Stroke Snowmobile | 1990s–2010s |
| Various | High-Compression Modified Two-Strokes | Motocross / Enduro / Sled | Select Years |
TSO Garage Note: A cold heat range (9) standard resistor plug with a 19mm reach, standard gap, and a solid terminal nut. The BR9ES is the colder, standard-electrode counterpart to the BR9EG, serving as the factory OEM heat range for high-revving 125cc motocross engines and many traditional liquid-cooled snowmobiles. The solid-terminal variant is ideal for high-vibration applications where removable terminal nuts can back out under aggressive racing frequencies or high-frequency sled harmonics.
Compatibility
Fetching compatibility details...
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