NGK PMR9B 4717 Laser Platinum Spark Plug Kawasaki Ultra 250/260/300/310 STX

Vehicle Fitment

• 2009-2013 Aprilia Scarabeo 200 (Base, 200cc)
• 2003-2007 Kawasaki STX-12F (JT1200, 1,199cc)
• 2004-2015 Kawasaki STX-15F (JT1500, 1,498cc)
• 2009-2010 Kawasaki STX (JT1500, 1,498cc)
• 2007-2008 Kawasaki Ultra LX (JT1500, 1,498cc)
• 2007-2008 Kawasaki Ultra 250X (JT1500, 1,498cc)
• 2009-2010 Kawasaki Ultra 260X (JT1500, 1,498cc)
• 2009-2010 Kawasaki Ultra 260LX (JT1500, 1,498cc)
• 2011-2016 Kawasaki Ultra 300 (JT1500, 1,498cc)
• 2011-2016 Kawasaki Ultra 300X (JT1500, 1,498cc)
• 2011-2016 Kawasaki Ultra 300LX (JT1500, 1,498cc)
• 2014-2023 Kawasaki Ultra 310 (JT1500, 1,498cc)
• 2014-2023 Kawasaki Ultra 310X (JT1500, 1,498cc)
• 2014-2023 Kawasaki Ultra 310LX (JT1500, 1,498cc)
• 2015-2023 Kawasaki Ultra 310R (JT1500, 1,498cc)
• 2016-2023 Kawasaki Ultra 310X SE (JT1500, 1,498cc)

Fitment Notes

• Designed for personal watercraft (PWC) applications only; not intended for automotive use.
• Replaces Kawasaki OEM part number 92070-3707 on all confirmed 1,498cc JT1500 platform applications.
• STX-12F uses the 1,199cc engine; all other Kawasaki models listed use the 1,498cc supercharged inline-4 engine.
• Sold individually (1x plug per unit); most listed Kawasaki models require 4 plugs per watercraft.

Features

• Laser-welded platinum fine wire center electrode delivers precise, consistent spark for improved combustion and ignitability.
• Dual platinum construction - platinum tip on both center and ground electrode - ensures slow, even wear for extended service life.
• Iridium-grade durability with a platinum center electrode that withstands high temperatures in supercharged PWC engines.
• Trivalent metal shell plating provides superior anti-corrosion and anti-seizing protection in marine environments.
• Pure alumina silicate ceramic insulator offers superior strength, better heat transfer, and resistance to dielectric punch-through.
• Triple gasket seal construction prevents combustion gas leakage for long-term reliability under sustained high-RPM use.
• Corrugated insulator ribs prevent electrical flashover during high-load watercraft operation.
• 98% pure copper core aids in heat dissipation, maintaining stable operating temperature across the powerband.

Specifications

• NGK Part Number: PMR9B
• NGK Stock Number: 4717
• Plug Type: Laser Platinum (Dual Platinum)
• Thread Diameter: 10mm
• Thread Pitch: 1.0mm
• Seat Type: Gasket
• Thread Reach: 19mm (3/4")
• Hex Size: 5/8" (16mm)
• Terminal Type: Solid (Non-Removable)
• Resistor: Yes - 5,000 Ohm
• Manufacturer Heat Range: 9
• Center Electrode Material: Platinum Alloy
• Ground Electrode: Platinum Pad
• Torque Spec (Cast Iron): 7.2-10.8 lb-ft
• Torque Spec (Aluminum): 7.2-8.7 lb-ft
• OEM Replacement for Kawasaki: 92070-3707

Included Components

• 1x NGK PMR9B Laser Platinum Spark Plug

Product Description

The NGK PMR9B (Stock No. 4717) is a Laser Platinum spark plug engineered for high-performance personal watercraft engines, with primary fitment covering Kawasaki's JT1500 supercharged inline-4 platform spanning the STX-15F, Ultra 250X, Ultra 260, Ultra 300, and Ultra 310 series. The dual platinum construction - featuring laser-welded platinum tips on both the center and ground electrodes - delivers significantly lower wear rates than standard nickel plugs, making it ideal for the high-temperature, high-RPM demands of supercharged marine engines. It is the OEM-equivalent replacement for Kawasaki part 92070-3707.

The 10mm thread with gasket seat fits directly into Kawasaki's compact cylinder heads without modification. The built-in 5K Ohm resistor suppresses electromagnetic interference, protecting watercraft electronics and sensors from ignition-generated noise. With the smaller 10mm thread size specific to Kawasaki's PWC engine family, confirming thread diameter before installation is recommended. These plugs are sold individually - most Kawasaki JT1500 four-cylinder watercraft require a set of four plugs per service interval.