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Spark Plugs Replacement Schedule

Old 05-15-2018, 02:43 PM
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NGK is an original equipment manufacture for the S2000 spark plugs.
The factory spark plug for the S2000 is the Laser Platinum No. 7.


Laser Platinum - Factory specified plug. Honda recommends replacement every 60k miles or sooner.

These plugs are pre-gapped at .044". Do not adjust gap.

Iridium IX - For forced induction (supercharged/turbocharged), we recommend the Iridium IX. Use heat range No. 7 for power up to 375 bhp and No. 8 for power in excess of 375 bhp.

Iridium plugs offer increased electrical efficiency with a narrower iridium type electrode.

The primary benefit of this plug is is thermal resistance making it ideal for high horsepower supercharged or turbocharged applications which experience high cylinder temperatures. We recommend inspection / replacement at 30k miles.

Heat range No. 7 pre-gapped at .044" and No. 8 at .032".

Adjust plug gap from factory specification (.044") approximately .004" less for every 50 bhp added. For example: an application adding 150 bhp to the factory 240 bhp would require a .032" gap (.044" - .012").
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Old 05-15-2018, 05:43 PM
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Gapped at 0.044"?! These are Japanese cars and the OEM plug spec is (as I noted in a very short message) metric, of course: 1.1mm. Not sure how these inexact Imperial measurements keep creeping in here.

-- Chuck
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Old 05-15-2018, 11:05 PM
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And copied from <Scienceofspeed>American website,no less
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Old 05-15-2018, 11:14 PM
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Originally Posted by Chuck S View Post
Gapped at 0.044"?! These are Japanese cars and the OEM plug spec is (as I noted in a very short message) metric, of course: 1.1mm. Not sure how these inexact Imperial measurements keep creeping in here.

-- Chuck
Perfectly accurate, imperial was around long before metric and is a vastly superior system, that's why even though you are on the wrong side of the Atlantic (and the road) you still use miles on your road signs, mind I can understand your confusion, the good old USA totally fecked up on Gallons.
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