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NGK 5687 Spark Plug
| Brand | NGK 5687 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | Taper cut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Removable nut |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | .032 |
| Ground Electrode Quantity | 1 |
| Hex Size | 13/16 |
| Insulator Height | 55.00 |
| Manufacturer Heat Range | 9 |
| Seat Type | Flat |
| Reach | .5 |
| Thread Diameter | 14.00 |
| Part Number | Br9hix |
| Stock Number | 5687 |
| Product line | Iridium IX Spark Plug |
| Fits | Cobra, Kawasaki, Maico, Moto-Ski, Ski-Doo, and Yamaha · 61 vehicles |
Iridium tip. Provides a durable firing surface for consistent ignition performance.
OE-style construction. Built to original equipment standards for dependable operation.
Heat range 9. Matched to the specified application requirements for this plug.
Cross-references AMS Automotive 4050, Champion Spark Plug 678 and DENSO Auto Parts 5381 for the same application. See all 15.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Iridium IX Spark Plug Overview
NGK Iridium IX Spark Plug 5687 is built for applications that call for a 14 mm, flat-seat spark plug with a 1/2-inch reach and a removable nut terminal. It uses an iridium center electrode, copper core, and nickel ground electrode to support consistent ignition performance. This NGK spark plug 5687 is listed for a wide range of vintage motorcycles and snowmobiles, including Kawasaki, Ski-Doo, and Yamaha applications.
Key Features
- Iridium center electrode tip for stable spark delivery
- Copper core center electrode for efficient heat transfer
- Nickel ground electrode with taper-cut tip design
- 5000 ohm resistor design for ignition noise control
- Flat seat, 14 mm thread, and 13/16-inch hex
- Pre-gapped at .032 inches for the base specification
Detailed Product Information
Part number 5687, also identified as BR9HIX, is an NGK Iridium IX spark plug engineered around OE-style construction standards. The design combines an iridium firing tip with a copper core center electrode and a standard ground configuration to promote reliable combustion in older two-stroke and small-engine applications. Fitment includes 1967-2000 Kawasaki, 1971-1979 Ski-Doo, 1972 Yamaha CS5, and 1994-2000 Cobra CM50 and BM50 models, with application-specific gap notes listed in the fitment data. This part cross-references Champion Spark Plug 678 and DENSO Auto Parts 5381 for the same application.
What It Is Used For
- Restoring weak or inconsistent spark output
- Replacing worn plugs with excessive electrode wear
- Addressing hard starting caused by plug fouling
- Improving ignition stability in older two-stroke engines
- Matching the specified heat range and reach for listed applications
Installation Notes and Tips
Verify the listed gap specification for the exact application before installation, since fitment notes vary by vehicle. Confirm the 14 mm thread diameter, 1/2-inch reach, and flat-seat design match the engine specification. Use the application notes for the correct gap setting on each listed Kawasaki, Ski-Doo, Yamaha, Maico, or Cobra model. Part number 5687 should be checked against the vehicle service information before final tightening.
Quality Assurance
NGK is a major OE supplier of spark plugs in North America and has more than 80 years of automotive manufacturing experience. The brand states that it maintains original equipment standards for durability and operational performance across its spark plug lineup.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 2000 | Cobra | CM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1999 | Cobra | CM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1998 | Cobra | CM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1997 | Cobra | BM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1997 | Cobra | CM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1997 | Cobra | KING | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1996 | Cobra | BM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1995 | Cobra | BM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1994 | Cobra | BM50 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1983 | Maico | 250 | -L | -- | 1/2" Reach; MC250; Gap 0.024"; Iridium IX Spark Plug |
| 1983 | Maico | 400 | -L | -- | 1/2" Reach; MC400; Gap 0.024"; Iridium IX Spark Plug |
| 1982 | Maico | 250 | -L | -- | 1/2" Reach; MC250; Gap 0.024"; Iridium IX Spark Plug |
| 1982 | Maico | 400 | -L | -- | 1/2" Reach; MC400; Gap 0.024"; Iridium IX Spark Plug |
| 1981 | Maico | 250 | -L | -- | 1/2" Reach; MC250; Gap 0.024"; Iridium IX Spark Plug |
| 1981 | Maico | 400 | -L | -- | 1/2" Reach; MC400; Gap 0.024"; Iridium IX Spark Plug |
| 1979 | Kawasaki | KD175 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1979 | Maico | 250 Enduro | -L | -- | 1/2" Reach; MC250; Gap 0.024"; Iridium IX Spark Plug |
| 1979 | Moto-Ski | Nuvik | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1979 | Ski-Doo | Everest 340 | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1979 | Ski-Doo | Everest 340E | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1978 | Kawasaki | KD175 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1978 | Maico | 250 Enduro | -L | -- | 1/2" Reach; MC250; Gap 0.024"; Iridium IX Spark Plug |
| 1978 | Moto-Ski | Nuvik | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1978 | Ski-Doo | Citation 300 | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1978 | Ski-Doo | Everest 340 | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1978 | Ski-Doo | Everest 340E | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1978 | Ski-Doo | Olympique 300T | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1978 | Ski-Doo | Olympique 340 | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1978 | Ski-Doo | Olympique 340E | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1977 | Kawasaki | KD175 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1976 | Kawasaki | KD175 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1976 | Kawasaki | KH250 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1976 | Kawasaki | KH500 | -L | -- | Set spark plug gap to 0.040 inches.; Iridium IX Spark Plug |
| 1975 | Kawasaki | F11 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1975 | Kawasaki | F7 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1975 | Kawasaki | H1 Mach III | -L | -- | Set spark plug gap to 0.040 inches.; Iridium IX Spark Plug |
| 1975 | Kawasaki | H2 Mach IV | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1974 | Kawasaki | F11 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1974 | Kawasaki | F7 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1974 | Kawasaki | H1 Mach III | -L | -- | Set spark plug gap to 0.040 inches.; Iridium IX Spark Plug |
| 1974 | Kawasaki | H2 Mach IV | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1974 | Kawasaki | KX450 | -L | -- | Set spark plug gap to 0.040 inches.; Iridium IX Spark Plug |
| 1973 | Kawasaki | F11 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1973 | Kawasaki | F7 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1973 | Kawasaki | H1 Mach III | -L | -- | Set spark plug gap to 0.040 inches.; Iridium IX Spark Plug |
| 1973 | Kawasaki | H2 Mach IV | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1973 | Kawasaki | S1 Mach I | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1973 | Kawasaki | S2 Mach II | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1973 | Ski-Doo | TNT 340 | -L | -- | TNT; Gap 0.020"; Iridium IX Spark Plug |
| 1972 | Kawasaki | F7 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1972 | Kawasaki | H1 Mach III | -L | -- | H1-B; MAG; Gap 0.028"; Iridium IX Spark Plug |
| 1972 | Kawasaki | H2 Mach IV | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1972 | Kawasaki | S2 Mach II | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1972 | Yamaha | CS5 | -L | -- | Spark Plug Gap: 0.024 inches; Iridium IX Spark Plug |
| 1971 | Kawasaki | F7 | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1971 | Kawasaki | G31M | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1970 | Kawasaki | G31M | -L | -- | Gap size is 0.020"; Iridium IX Spark Plug |
| 1968 | Kawasaki | A7 Avenger | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1968 | Kawasaki | A7SS | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1967 | Kawasaki | A7 Avenger | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
| 1967 | Kawasaki | A7SS | -L | -- | Set spark plug gap to 0.028 inches.; Iridium IX Spark Plug |
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