Spark Plug NGK Iridium IX CR9EIX (3521)

The NGK 3521 (CR9EIX) Iridium IX spark plug is a high-tech solution designed for modern high-performance engines, primarily in motorcycles. The key feature is its ultra-fine 0.6mm iridium center electrode, which ensures stable spark generation under extreme loads and reduces the required secondary voltage. The special tapered-cut ground electrode minimizes the flame quenching effect and promotes more complete combustion of the air-fuel mixture. The use of iridium alloy guarantees high corrosion resistance and extends the service life up to twice that of standard nickel plugs. This model (SKU 087295135211) offers excellent self-cleaning properties, preventing carbon fouling even during frequent short-distance trips. It is highly recommended for high-performance engines from Kawasaki, Suzuki, and Yamaha, where instant throttle response and reliability at high RPM are critical.