NGK BR9EIX Spark Plug – Heat range 9 resistor iridium performance plug for KZ, CR125, YZ125, Mod Moto, and Open 125cc engines. 14mm thread, 19mm (3/4") reach, 13/16" hex. Iridium fine-wire center electrode with nickel ground delivers strong, consistent spark and combustion stability at high RPM. Slightly hotter heat range than BR10EIX for leaner or hotter conditions; extended life and better performance than nickel plugs.
NGK 10 Heat Range Spark Plug Comparison
| Plug | Electrode | Ground | Ignition Strength | Longevity | Notes |
|---|---|---|---|---|---|
| R7282-10 | Iridium fine wire | Platinum slant | Highest (race-focused) | High | True racing plug, maximum stability under extreme RPM/pressure |
| R7376-10 | Iridium fine wire | Platinum slant | High | High | Very similar to R7282-10, uses standard plug cap, lower cost |
| BR10EIX | Iridium fine wire | Nickel | Good | Longest | Best street/dual use; iridium life + broad compatibility |
| BR10EG | Nickel | Nickel | Moderate | Shortest | Budget racing plug; older tech, wears faster |
