NGK CR9EB Spark Plugs for Yamaha Jet Boats — 8-Pack Nickel/Copper OE-Style, Heat Range 9

NGK CR9EB (stock no. 6955) is a set of eight nickel/copper standard replacement spark plugs designed to meet the original-equipment fit and performance requirements for select Yamaha jet boat engines from 2003–2015.

These NGK Standard spark plugs deliver dependable ignition characteristics and factory-style specifications for compatible Yamaha FRT, LAT, SRT and SXT series engines. Built with a copper core and nickel-alloy tip, a ceramic insulator, and an integrated resistor, they balance conductivity and noise suppression while matching OE reach, thread diameter, and heat range for straightforward installation and consistent combustion.

Which Yamaha models and years will these plugs fit?

The CR9EB (6955) plugs are confirmed for a range of Yamaha jet boats produced between 2003 and 2015. Fitment covers several engine families and model designations—always cross-check with your boat’s VIN, owner’s manual, or NGK fitment charts before purchase.

• Compatible series include FAT1100, FRT1100, LAT1100, SRT1000/SRT1100 and SXT1100 variants.
• Common boat models: AR210, SX210, 212SS, 212X, SR230, AR230, SX230 and several 232 Limited editions.
• Year coverage: examples range from 2003 (SR230) through 2015 (LAT1100 1052cc models).

What are the key specifications and materials of these plugs?

These NGK plugs use traditional OE-style materials and dimensions to match factory expectations: a copper core for heat transfer, a nickel-plated center tip for durability, and a high-grade alumina-silicate ceramic insulator. The parts include a built-in resistor to reduce electrical interference and a crush washer for a gas-tight seat.

• Part number: CR9EB, stock number: 6955; heat range: 9.
• Thread: 10.0 mm (0.394") diameter with 19.0 mm (0.750") reach; 5/8" (16 mm) hex.
• Pre-gap: 0.8 mm (0.032"); insulator height: 50.8 mm (2.00").
• Construction: copper core, nickel alloy tip, ceramic insulator, resistor type, single J-gap ground electrode.

How does installation and maintenance look for these NGK plugs?

Installation is straightforward for anyone familiar with spark plug replacement: verify the correct plug gap, torque to the manufacturer’s specification, and replace in sets to maintain even ignition. The CR9EB design mirrors OE geometry so swapping into stock locations requires no modifications.

• Gap out of box: 0.8 mm (0.032"); adjust only if your engine manual specifies otherwise.
• Use a 5/8" (16 mm) socket and torque per Yamaha recommended values for crush washer seating.
• Replace plugs in full sets (this listing supplies eight) to keep uniform ignition across cylinders.

What performance and reliability features should I expect?

Designed as a standard replacement, these NGK plugs focus on steady, OE-like ignition performance rather than premium iridium longevity. Expect reliable heat dissipation from the copper core and effective noise suppression from the integrated resistor, which helps protect electronics and radios.

• OEM-style nickel alloy tip offers solid durability in marine ignition environments.
• High-grade ceramic insulator for strong dielectric strength and sealing.
• Triple-gasket-style sealing and crush washer ensure combustion integrity.

Who is this for: Boaters and service technicians who need an affordable, factory-spec replacement spark plug set for Yamaha jet-propelled boats built between 2003 and 2015. This eight-pack suits owners performing scheduled tune-ups, fleet maintainers, or anyone restoring original ignition components while keeping installation simple and parts consistent with OEM design.