Description
Overview:
The NGK BR9HS-10 is a resistor-type spark plug for small petrol engines where clean, consistent ignition is required. It uses a durable steel shell with a ceramic insulator and a central electrode to create the spark that ignites the air-fuel mixture. With its short-reach design and M14 thread, it suits many compact, air‐cooled engines often found in construction and garden equipment, such as chainsaws, brushcutters, hedge trimmers, and cut-off saws. It is supplied as a single plug. Key dimensions include a 20.8 mm (13/16 in) hex for easy socket access, 9.5 mm (3/8 in) reach for shallow cylinder heads, and a preset 1.0 mm (0.040 in) gap. Part code is BR9HS-10 with manufacturer reference 4551.
Key Features:
- Reliable cold start and stable running due to resistor design (helps reduce electrical interference)
- M14 x 1.25 thread for common small-engine compatibility (14 mm diameter, 1.25 mm pitch ≈ 0.049 in)
- Short 9.5 mm (3/8 in) reach for shallow plug holes in compact cylinder heads
- 20.8 mm hex (13/16 in) for straightforward fitting with standard sockets
- Factory-set 1.0 mm (0.040 in) gap for consistent ignition performance
- Robust ceramic insulator and metal shell aimed at long service life under high temperatures
- Suitable for many air-cooled two-stroke applications where a heat range "9" plug is specified
- Sold individually for convenient maintenance and like-for-like replacement
Typical Applications:
Used in small petrol engines on construction and landscaping equipment where a short-reach M14 plug is specified, including chainsaws, brushcutters, hedge trimmers, and disc cutters. Also found in certain compact generators, pumps, and similar machinery requiring a resistor plug with a 1.0 mm (0.040 in) gap and 20.8 mm (13/16 in) hex.
Also known as:
Sparking plug, resistor ignition plug, engine ignition electrode, petrol engine igniter, high‐tension ignition plug.
Alternate Part Numbers:
09482-00467, 0948200467
Product Specifications
| L&S Part No. | BR9HS-10 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | NGK |
| OEM No. | 4551 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Key Features | - Resistor design reduces electrical interference for stable engine performance - M14 x 1.25 thread fits common small-engine applications - 9.5 mm reach suits shallow cylinder heads - 20.8 mm hex allows easy socket access - Preset 1.0 mm gap ensures consistent ignition |
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