NGK 3521 CR9EIX Iridium IX Spark Plug
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New South Wales 2000,
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Precision spark plug for smooth combustion
The NGK 3521 CR9EIX Iridium IX Spark Plug delivers reliable ignition for stable engine performance. Featuring a laser-welded iridium centre electrode, this resistor-type plug provides exceptional anti-fouling and high-performance durability. It is a premium upgrade for selected Yamaha WaveRunner (PWC) models, engineered for improved starting, idling, and throttle response.
NGK 3521 CR9EIX Iridium IX Spark Plug Features:
- Built to NGK standards for long life and consistent performance
- High-quality upgrade/ replacement
- Trivalent metal plating for strong anti-corrosion and anti-seizing protection
- Corrugated ribs help prevent flashover
- Pure alumina silicate ceramic insulator for strength and efficient heat transfer
- Copper core aids heat dissipation
- Triple seals help prevent gas leakage
NGK 3521 CR9EIX Iridium IX Spark Plug Specifications:
Shell:
- Model Number: CR9EIX
- Part Number: 3521
- Thread Diameter: 10 mm
- Thread Pitch: 1.0 mm
- Seat Type: Gasket
- Reach: 19 mm (3/4")
- Hex Size: 16 mm (5/8")
- Terminal Type: Removable Nut
- Overall Height: ISO
- Gap: 0.8 mm (0.031")
Centre Electrode:
- Material: Iridium
- Type: Fine Wire
- Size: 0.6 mm
- Design: Non-Projected
Ground Electrode:
- Material: Nickel
- Type: Standard
- Shape: Taper Cut
- Quantity: 1
Electrical Performance:
- Resistor: Yes (5k Ohm)
- Heat Range: 9
Installation:
- Torque (Aluminium): 10-12 Nm (7.2-8.7 lb-ft)
- Torque (Cast iron): 10-15 Nm (7.2-10.8 lb-ft)
Compatible Yamaha WaveRunner (PWC) Models:
- VX Series: Compatible with selected models equipped with MR-1 engines
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