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NGK 7909 Spark Plug
| Brand | NGK 7909 |
|---|---|
| Resistance | 1 |
| Ground Electrode Tip Design | Standard |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | .028 |
| Ground Electrode Quantity | 1 |
| Hex Size | 13/16 |
| Insulator Height | 55.00 |
| Manufacturer Heat Range | 8 |
| Seat Type | Flat |
| Reach | .429 |
| Thread Diameter | 18.00 |
| Part Number | Ab-8 |
| Stock Number | 7909 |
| Product line | Standard Spark Plug |
| Fits | Moto-Ski and Ski-Doo · 32 vehicles |
OE-style design. Built to original equipment standards for ignition service.
Copper core. Copper center electrode core with nickel tip materials.
Standard spark plug. For secondary ignition service in specified applications.
Cross-references Baldwin B2, Bosch 7909 and Hayden 372 for the same application. See all 22.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Overview
NGK 7909 is a standard spark plug built with a copper center electrode core, nickel tip materials, and a flat seat design. It is engineered for older snowmobile applications that call for a 0.020-inch gap and a removable nut terminal.
Compatible with select Ski-Doo and Moto-Ski models, this spark plug supports reliable ignition performance in vintage two-stroke applications. The NGK 7909 part number is also referenced as AB-8.
Key Features
- Standard spark plug design for secondary ignition service
- Copper center electrode core with nickel tip materials
- Flat seat construction with a removable nut terminal
- Pre-gapped at .028 with a 13/16 hex size
- Heat range 8 for specified application requirements
Detailed Description
NGK 7909 is a standard spark plug from NGK’s Standard Spark Plug line, a product family focused on OE-style ignition service. NGK’s long-standing role as a major OE spark plug supplier is reflected in the materials and construction used here, including a copper core center electrode, nickel ground and center tip materials, and a standard ground configuration. The NGK 7909 part number appears in fitment for Ski-Doo Everest 440, Ski-Doo TNT 440, Ski-Doo TNT 292, Ski-Doo TNT 640, Ski-Doo TNT 775, Ski-Doo Nordic 640E, Ski-Doo Nordic 640ER, Ski-Doo Valmont 640ER, and Moto-Ski Futura applications.
This spark plug cross-references Bosch 7909 for the same application.
What It Is Used For
- Restoring ignition performance in older snowmobile engines
- Replacing worn plugs that cause hard starting
- Addressing misfire, fouling, or weak spark conditions
- Maintaining correct gap and heat range for specified applications
Installation Notes and Tips
Verify the required gap, seat type, thread diameter, and heat range before installation. This plug is listed for applications with a 0.020-inch gap requirement, so confirm the engine specification against the vehicle service information before use. The removable nut terminal allows installation in systems that require that terminal style.
Quality Assurance
NGK manufactures spark plugs to original equipment standards and supports a broad range of automotive, motorcycle, marine, and small engine applications. The brand’s OE supplier background and North American manufacturing and distribution network support consistent product availability and application coverage.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 1979 | Moto-Ski | Futura | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1979 | Ski-Doo | Everest 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1979 | Ski-Doo | Everest 440E | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1978 | Moto-Ski | Futura | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1978 | Ski-Doo | Everest 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1978 | Ski-Doo | Everest 440E | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1977 | Moto-Ski | Futura | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1977 | Ski-Doo | Everest 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1977 | Ski-Doo | Everest 440E | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1976 | Ski-Doo | Everest 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1976 | Ski-Doo | Everest 440E | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1975 | Ski-Doo | Everest 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1975 | Ski-Doo | TNT 440 | -L | -- | Exc. FA; Gap 0.020"; Standard Spark Plug |
| 1974 | Ski-Doo | Everest 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1974 | Ski-Doo | TNT 440 | -L | -- | Exc. FA; Gap 0.020"; Standard Spark Plug |
| 1973 | Ski-Doo | TNT 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1972 | Ski-Doo | Nordic 640ER | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1972 | Ski-Doo | TNT 292 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1972 | Ski-Doo | TNT 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1972 | Ski-Doo | TNT 640 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1972 | Ski-Doo | TNT 775 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1971 | Ski-Doo | Nordic 640E | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1971 | Ski-Doo | TNT 292 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1971 | Ski-Doo | TNT 340 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1971 | Ski-Doo | TNT 440 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1971 | Ski-Doo | TNT 640 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1971 | Ski-Doo | TNT 775 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1971 | Ski-Doo | Valmont 640ER | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1970 | Ski-Doo | Nordic 640E | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1970 | Ski-Doo | TNT 292 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1970 | Ski-Doo | TNT 340 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
| 1970 | Ski-Doo | TNT 640 | -L | -- | Gap size is 0.020"; Standard Spark Plug |
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