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Been using NGK spark plugs for 40 years without issue. No problems with the iridium either. There is virtually no difference in performance compared to copper plugs. Technically copper plugs have larger surface area so easier to spark and fatter spark, whereas iridium have much longer life (double that of copper) so higher cost is covered. If getting to your plugs is an all day job, go with iridium.
Verified purchase: Yes | Condition: New
Good price the bike starts better I recommend this product.
Verified purchase: Yes | Condition: New
Used them before nice spark plug the best in my opinion
Verified purchase: Yes | Condition: New
What can you say about a spark plug - it sparks
Verified purchase: Yes | Condition: New
Definitely made a difference to my bike 👍
Verified purchase: Yes | Condition: New
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