Experience enhanced engine performance with the NGK CR9EIX (3521) Iridium IX Spark Plug, one of NGK’s highest-quality ignition solutions. Manufactured in Japan, this premium iridium spark plug delivers excellent ignition efficiency, improved throttle response, better fuel economy, and outstanding durability.

The ultra-fine iridium center electrode provides a consistent and powerful spark while reducing ignition voltage requirements. Its advanced design helps maintain smooth engine operation even under high-temperature and demanding riding conditions.

NGK Iridium IX plugs are trusted worldwide by motorcycle manufacturers and performance riders because of their reliability, advanced technology, and long-lasting performance.

Key Features & Benefits

✅ Genuine NGK Iridium IX Series Spark Plug
✅ Made in Japan quality
✅ Fine iridium tip for stable and powerful spark
✅ Improved throttle response and acceleration
✅ Better fuel efficiency
✅ Longer lifespan compared to standard spark plugs
✅ Superior anti-corrosion and anti-seizing protection
✅ Smooth engine running performance
✅ Excellent ignition efficiency
✅ Designed for high-temperature engines

Technical Specifications

Model: NGK Iridium IX CR9EIX
Part Number: 3521
Electrode Type: Iridium Center Electrode
Thread Size: 10 mm
Thread Length: 19 mm
Hex Size: 16 mm
Spark Position: 1 mm
Seat Type: Flat Sealing Seat
Resistance: 5k Ohm
Country of Manufacture: Japan

Compatible Bikes

✔ Honda CB150F
✔ Suzuki GS150
✔ Suzuki GS150SE

Original Reference Numbers

• SUZUKI: 99000-79A37-U7E
• YAMAHA: 90793-20123
• YAMAHA: 90793-20125
• YAMAHA: 90793-22086

Why Choose NGK Iridium IX?

NGK is a globally trusted spark plug manufacturer known for supplying ignition technology to leading motorcycle and vehicle manufacturers. Iridium technology offers:

• Reduced fuel consumption
• Longer service life
• Faster ignition
• Improved engine response
• More efficient combustion
• Reliable performance in extreme conditions