NGK CR8EB Copper Spark Plug – 7784

NGK CR8EB Copper Spark Plug – 7784

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NGK CR8EB Copper Spark Plug – 7784

Keep your BRP Rotax marine engine running smoothly with the NGK CR8EB Copper Spark Plug, stock number 7784. Designed for dependable ignition performance in compact four-stroke marine engines, the CR8EB combines NGK's proven copper-core construction with a resistor design that delivers consistent spark, effective heat transfer, and reliable operation throughout the boating season.

The solid copper core helps move heat away from the firing tip while providing excellent electrical conductivity. This makes the NGK 7784 a dependable choice for engines that see frequent starting, extended cruising, and changing RPM ranges. Its resistor construction also helps suppress electrical interference that can affect sensitive onboard electronics.

Replacing worn or fouled plugs can help correct hard starting, rough idle, hesitation, misfires, and reduced performance. Whether you're completing scheduled maintenance or preparing your watercraft for another season, the CR8EB provides a proven replacement for compatible BRP Rotax 900 ACE applications.

Spark Plug Specifications

  • Manufacturer: NGK

  • NGK Part Number: CR8EB

  • NGK Stock Number: 7784

  • Plug Type: Standard copper-core resistor spark plug

  • Heat Range: 8

  • Thread Diameter: 10 mm

  • Thread Reach: 19 mm

  • Hex Size: 16 mm

  • Recommended Gap: 0.8 mm

  • Seat Type: Gasket

  • Sold Individually

Common Engine Applications

The NGK CR8EB / 7784 spark plug is commonly used with the BRP Rotax 900 ACE three-cylinder four-stroke engine family, including:

  • BRP Rotax 900 ACE

  • BRP Rotax 900 ACE 60 HP

  • BRP Rotax 900 ACE 90 HP

  • BRP Rotax 900 ACE HO

Common Sea-Doo Fitments

Depending on model year and engine configuration, the NGK CR8EB is used in Sea-Doo models such as:

Sea-Doo Spark

  • Sea-Doo Spark 2UP 900 ACE

  • Sea-Doo Spark 3UP 900 ACE

  • Sea-Doo Spark 60

  • Sea-Doo Spark 90

  • Sea-Doo Spark HO

  • Sea-Doo Spark TRIXX 1UP

  • Sea-Doo Spark TRIXX 2UP

  • Sea-Doo Spark TRIXX 3UP

Sea-Doo GTI & GTS

  • Sea-Doo GTI 90

  • Sea-Doo GTI SE 90

  • Sea-Doo GTI 900 ACE

  • Sea-Doo GTS 90

  • Sea-Doo GTS 900 ACE

Replacement & Cross-Reference Numbers

The NGK CR8EB may be used as a replacement for select BRP/Sea-Doo spark plug numbers, including:

  • BRP 415129403

  • BRP 415130795

  • BRP 420297925

Always confirm the original plug number and engine application before ordering.

Key Features

  • Genuine NGK CR8EB standard spark plug

  • NGK stock number 7784

  • Copper-core construction provides excellent heat dissipation

  • Resistor design helps reduce electrical interference

  • Supports reliable starting and smooth acceleration

  • Helps maintain efficient combustion across varying RPM ranges

  • Proven fit for select BRP Rotax 900 ACE marine engines

  • Ideal for routine Sea-Doo maintenance and tune-ups

Dependable Ignition for Rotax 900 ACE Engines

A fresh set of spark plugs is an important part of keeping a Rotax 900 ACE engine performing properly. Worn electrodes or combustion deposits can weaken spark quality and contribute to poor starting, hesitation, and inconsistent performance. Installing the correct NGK CR8EB plugs helps maintain dependable ignition and smooth power delivery.

For Sea-Doo Spark, Spark TRIXX, GTI, and GTS models equipped with a compatible BRP Rotax 900 ACE engine, the NGK CR8EB 7784 Spark Plug provides a proven combination of fit, durability, and reliable ignition performance.

Fitment Note: Sea-Doo has used different engines and spark plug specifications across model years. Verify CR8EB / NGK 7784 against your engine model, year, or original BRP part number before ordering.