I use NGK... it's the same 1/16 turn instructions on my Suzuki outboard (also NGK) and I use the same method of 1/4 -1/2 turn. Been good with those over 6 or 7 changes.
I was told that the Motorcraft iridium's are made by NGK?
I opted for the NGK DIFR6D13, since these were suggested by a local Honda dealership. These seem to be perfectly fine for the CR-Z. No complaints at all.
I've been running the NGK "rs7" plugs 06K905601M in my wagon since I went IS20 with an APR stage 3 91 tune. Stock gap out of the box was .026. I've now put about 6k on them and have had zero issues.
I have NGK ruthenium’s and it is noticeably smoother at idle vs iridium’s. Literally zero idle “pop” or misfires
NGK Iridium gapped at 0.026 only. They’re great
I drive a 01 4runner and I run NGK plugs and wires. Almost 300k on the dash.
We changed that spark plug and the customer was happy with the magneto drop. That spark plug worked fine on a Champion spark plug bomb test.
I have measured resistance above 5k and determined the plug to be causing a problem. Typical resistance is 1-3 kOhm, sometimes less for a new one.
I gapped them at 0.70mm, still the car was not what it was. And at high speed the km go up but there is no pulling like before.
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