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What is the best spark plug for a 2003 Yamaha vstar 1100 custom?

NGK Iridium IX Spark Plugs

* Model: CR9EHIX

* Material: Iridium

* Heat range: 9

* Thread diameter: 12mm

* Reach: 19mm

* Gap: 0.032-0.034 in (0.8-0.86 mm)

These spark plugs are specifically designed for the 2003 Yamaha Vstar 1100 Custom and offer improved performance, fuel efficiency, and longevity compared to standard spark plugs.