NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix), 4 Pack
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Best for
Best iridium for compact engines
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Current price
$31.49
Updated Jun 27, 2026 · 1 min read
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
The NGK LKAR7BIX-11S Iridium IX set draws a 4.5-star average from more than 2,800 verified-purchase reviewers, the lowest average among the standalone NGK iridium sets in this pool even though its review volume is substantial. The consensus is still broadly positive, framing it as a dependable iridium replacement for compatible compact engines, but the slightly softer rating is worth noting against its iridium siblings. Without independent lab or specialist-community signals, the score reflects owner satisfaction alone, and the gap between this set's 4.5 and the 4.7–4.8 averages elsewhere is the main reason it lands at the bottom of this list.
What reviewers liked
- Large verified-purchase base of more than 2,800 reviews
- NGK Iridium IX durability reputation
- Competitively priced four-pack
Where it falls short
- 4.5 average is the lowest among the NGK iridium sets here
- Similar part numbers raise the risk of fitment mistakes
- No independent or community testing data available
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The NGK LKAR7BIX-11S Iridium IX set draws a 4.5-star average from more than 2,800 verified-purchase reviewers, the lowest average among the standalone NGK iridium sets in this pool even though its review volume is substantial. The consensus is still broadly positive, framing it as a dependable iridium replacement for compatible compact engines, but the slightly softer rating is worth noting against its iridium siblings.
Without independent lab or specialist-community signals, the score reflects owner satisfaction alone, and the gap between this set's 4.5 and the 4.7–4.8 averages elsewhere is the main reason it lands at the bottom of this list. Some of that may reflect fitment confusion across similar NGK part numbers rather than the plug itself, so careful cross-referencing is especially important here.
- Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling
- The 0.6 millimeter laser welded fine Iridium tip ensures high durability and a consistently stable spark and the tapered ground electrode minimizes electrical quenching effect
- Longer insulator nose prevents fouling, the corrugated ribs on insulator prevents flashover, and a triple gasket seal eliminates combustion gas leakage
- Iridium alloy has extremely high melting point, giving it high durability to heat and electrical wear, perfect for today's high performance engines
- Trivalent Metal Plating provides superior anti-corrosion and anti-seizing properties
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