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NGK 6419 Spark Plug
| Brand | NGK 6419 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Standard |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .036 |
| Ground Electrode Quantity | 1 |
| Hex Size | 5/8 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 9 |
| Seat Type | Flat |
| Reach | .75 |
| Thread Diameter | 10.00 |
| Part Number | Cr9ehi-9 |
| Stock Number | 6419 |
| Product line | Laser Iridium Spark Plug |
| Fits | Honda · 27 vehicles |
Laser iridium design. Provides precise ignition performance with a durable iridium center electrode.
OE supplier heritage. Backed by NGK's long-standing focus on original equipment ignition standards.
Application-specific fitment. Built for listed Honda motorcycle and scooter spark plug applications.
Cross-references AMS Automotive 6419, 5388 and IUH27D for the same application. See all 3.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Laser Iridium Spark Plug Overview
NGK Laser Iridium Spark Plug 6419 is built for specific Honda motorcycle and scooter applications that call for a 0.036-inch gap and a flat-seat design. This spark plug combines an iridium center electrode with a nickel ground electrode for consistent ignition performance across the listed fitments, including Honda CBR650F, CB600F 599, and CRF150R applications.
Key Features
- Laser iridium center electrode for precise spark delivery.
- Copper core center electrode for efficient heat transfer.
- Nickel ground electrode with standard tip and standard configuration.
- 0.036-inch pre-gap for the listed Honda applications.
- Flat seat, 10 mm thread diameter, and 5/8-inch hex size.
- Part number 6419, also identified as CR9EHI-9.
Detailed Description
NGK 6419 is a laser iridium spark plug engineered around the specifications shown in the product data: 5000 ohm resistance, 0.75-inch reach, stud terminal, and heat range 9. The iridium tip supports stable ignition characteristics, while the copper core and nickel ground electrode help manage heat and durability in demanding small-displacement and high-revving Honda engines. This part number 6419 is listed for a wide range of Honda fitments, including 2020 Honda CRF150R, 2018 Honda CBR650F ABS, and 1991-1994 Honda CBR600F F2.
NGK’s OE supplier background and long-standing ignition focus make this spark plug a direct choice for buyers looking for an OE-style replacement from a recognized ignition specialist. This part cross-references AMS Automotive 6419 for the same application.
What It Is Used For
- Restoring weak or inconsistent spark output.
- Addressing misfire conditions tied to worn plugs.
- Replacing plugs with excessive electrode wear or fouling.
- Maintaining proper ignition performance in listed Honda motorcycles and scooters.
- Supporting smooth starting and steady combustion in the specified applications.
Installation Notes and Tips
Verify the specified gap before installation and confirm the flat-seat design matches the engine’s requirements. Use the listed part number 6419 and CR9EHI-9 reference when checking application data for your Honda model. Fitment includes 2020 Honda CRF150R, 2018 Honda CB650F ABS, 2014-2016 Honda CBR650F, 2010 Honda NHX110 Elite, and 1988-1990 Honda NX250.
Quality Assurance
NGK is a major OE spark plug supplier in North America and manufactures ignition components to original equipment standards. The brand’s manufacturing focus and application coverage support consistent product quality for the listed fitments.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 2020 | Honda | CRF150R | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2020 | Honda | CRF150R Expert | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2018 | Honda | CB650F | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2018 | Honda | CB650F ABS | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2018 | Honda | CBR650F | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2018 | Honda | CBR650F ABS | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2016 | Honda | CBR650F | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2016 | Honda | CBR650F ABS | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2015 | Honda | CBR650F | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2015 | Honda | CBR650F ABS | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2014 | Honda | CBR650F | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2010 | Honda | NHX110 Elite | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2006 | Honda | CB600F 599 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2004 | Honda | CB600F 599 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 2000 | Honda | CBR600F F4 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1999 | Honda | CBR600F F4 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1998 | Honda | CBR600F F3 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1997 | Honda | CBR600F F3 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1996 | Honda | CBR600F F3 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1995 | Honda | CBR600F F3 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1994 | Honda | CBR600F F2 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1993 | Honda | CBR600F F2 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1992 | Honda | CBR600F F2 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1991 | Honda | CBR600F F2 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1990 | Honda | NX250 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1989 | Honda | NX250 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
| 1988 | Honda | NX250 | -L | -- | Gap 0.036"; Laser Iridium Spark Plug |
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