Decoding NGK Spark Plugs! Everything you need to know about NGK spark plugs.
Plug Temperature – Quick Reference Chart
| Plug Temperature | Temperature Use | NGK | Denso Equivalent |
| Colder Plugs | Hot Weather | BR11EGV | IW34 |
| Cold Plugs | Warm – Hot Weather | BR10EGV | IW31 |
| Normal plugs | Average Weather | BR9EGV | IW27 |
| Warm Plugs | Cold Weather | BR8EGV | IW24 |
Note: Whilst still available, EGV spark plugs (1.0mm centre electrode diameter) have become outdated and are being superseded globally by the IX “iridium” spark plug (0.6mm centre electrode diameter) which provide optimal performance by reducing the “quenching effect“)
NGK Part Numbers & Letters
Youtube: Spark Plug Numbers & Letters – NGK Spark Plugs -Tech Video
Reading a spark plug when tuning
Youtube: Reading a Spark Plug-NGK Spark Plugs-Tech Video
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