26/08/2026
Go for the better performance and quite a longer run !!! πββοΈπββοΈπββοΈπ¨
For your Honda CB400 Super Four (NC31), upgrading to the iridium CR8EHIX-9 is highly recommended and considered one of the best quality-of-life improvements for this specific platform.
The NC31 features an inline-four, high-revving, carbureted engine. Because of this unique mechanical blueprint, the iridium upgrade provides very noticeable real-world advantages.
Why Iridium is Better for the NC31???
1. Easier Cold Starts: Inline-four carb setups can be finicky during cold starts, especially if the bike sits for a while. The 0.6mm fine tip requires less voltage from your ignition coils to spark, meaning quicker, crisp starts without draining the battery.
2. Resists Carbon Fouling: Old-school carburetors easily foul plugs if the fuel mixture runs slightly rich or if you idle too long. Iridium runs hotter at its core tip, which burns off carbon deposits and prevents the bike from dropping a cylinder.
3. Smoother Low-RPM Idling: The ultra-focused spark creates more uniform combustion across all four cylinders. This cleans up the common "idling sputter" or hesitation that standard nickel CR8EH-9 plugs face when they degrade.
4. Less Maintenance Hassle: Changing plugs on an NC31 requires removing the seat, lifting the fuel tank, and negotiating tight spaces with a thin-walled plug wrench. Because iridium plugs last roughly 30,000 to 40,000+ kilometers, you do not have to perform this tedious task nearly as often as you would with standard nickel plugs (which degrade around 10,000 km).
The Verdict!!! πΉ βοΈ π
Of course, you will need four plugs total for your NC31. While buying four iridium plugs costs more upfront, the improved engine response, cleaner idle, and long lifespan mean they easily pay for themselves over time by keeping your classic Super Four running smoothly.
Your choice depends on your budget... π
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Hon Moto
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