bbeem
Senior Member
- First Name
- Ben
- Joined
- Nov 10, 2018
- Threads
- 38
- Messages
- 1,131
- Reaction score
- 617
- Location
- Iowa
- Vehicle(s)
- 19 si sedan, FZ1, CR450R, Shadow 750
- Vehicle Showcase
- 1
I want to try them, where'd you order? What was the factory gap? You like them? Thanks.What part numbers did you try? I switched to Ruthenium HX on my Si about two months ago and I didn't have any fitment issues. I also greased them up with dielectric grease, so it's possible the boot slipped over more easily.
I don't recall seeing any size difference in the ceramic insulator between them, though. I compared OEM with the HX side by side as I swapped them out.
I used NGK 91784 regapped to around 0.028"
Edit: I pulled out the old plugs and checked again, there is no size difference in the insulator between the OEM Si plug and NGK 91784.
I think they didn't give you an appropriate part to try. They currently do not have a part number of the HX plugs they recommend for the 10th gen civic. I chose this part by cross-referencing all 26 Ruthenium parts against the OEM plug spec.
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