Easy — 1–2 hours
Description
The spark plug has a copper/nickel material grade with a copper core and nickel tip for the center electrode, and nickel for the ground electrode. It includes a non-removable nut electrical terminal type and a J-gap ground configuration. The hex size is 5/8" (16mm) and the reach is 0.689 IN (17.5 mm).
Fitment
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Specifications
| Brand | NGK TR6 |
| Part Number | NGK-4177 |
| Category | Ignitions and Electrical |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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