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You better check around because those numbers do not match any ngk iridium plugs that I could find. Those are standard plugs, not iridium, they are copper core. I have an HX and that's what I run. The cost about 12.00 for 4 and you would never get iridium for that. The ngk numbers 4 & 5 are heat ranges 5 being the colder plug, 4's best for lean burn.
Last edited by iveyjh; 04-24-2015 at 03:04 PM..
Reason: heat range
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