NGK DCPR8E SPARK PLUG - 4339

NGK DCPR8E SPARK PLUG - 4339

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Part Number: 41-4339

NGK DCPR8E Spark Plug – 4339

The NGK DCPR8E Spark Plug, stock number 4339, is a proven ignition replacement for a wide range of Sea-Doo personal watercraft powered by BRP Rotax 4-TEC and ACE engines. Designed for dependable spark delivery in demanding marine conditions, it helps maintain quick starting, smooth idle quality, responsive acceleration, and consistent performance throughout the RPM range.

Built with NGK's copper-core electrode technology, the DCPR8E efficiently transfers heat away from the firing tip while maintaining reliable ignition under changing engine loads. Its resistor construction helps suppress electrical interference, an important feature on modern watercraft equipped with electronic engine management, digital gauges, and other onboard systems.

Worn or fouled plugs can cause hard starting, hesitation, rough running, misfires, and reduced power. Replacing them as part of routine Sea-Doo maintenance helps keep the engine performing as designed and reduces the chance of ignition-related problems on the water.

Spark Plug Specifications

  • Manufacturer: NGK

  • Part Number: DCPR8E

  • NGK Stock Number: 4339

  • Type: Standard resistor spark plug

  • Heat Range: 8

  • Thread Diameter: 12 mm

  • Thread Reach: 19 mm

  • Hex Size: 16 mm

  • Electrode Core: Copper

  • Standard Spark Gap: 0.8 mm on many 1503 applications

  • Sold Individually

Common BRP Rotax Engine Applications

The NGK DCPR8E / 4339 is used in select Sea-Doo engines, including:

  • BRP Rotax 1503 4-TEC

  • Rotax 1503 NA

  • Rotax 1503 NA iTC

  • Rotax 1503 Supercharged

  • Rotax 1503 SCIC

  • Rotax 1503 SCIC iTC

  • Rotax 1503 HO ACE

  • Select Rotax 1630 ACE applications

Common Sea-Doo Model Applications

Depending on year and engine configuration, the NGK 4339 is found in Sea-Doo models such as:

Sea-Doo GTI

  • Sea-Doo GTI 130

  • Sea-Doo GTI 155

  • Sea-Doo GTI SE 130

  • Sea-Doo GTI SE 155

  • Sea-Doo GTI Limited 155

Sea-Doo GTX

  • Sea-Doo GTX 155

  • Sea-Doo GTX 215

  • Sea-Doo GTX Limited

  • Sea-Doo GTX 230

Sea-Doo RXP

  • Sea-Doo RXP 155

  • Sea-Doo RXP 215

  • Select RXP-X applications

Sea-Doo RXT

  • Sea-Doo RXT 215

  • Sea-Doo RXT 230

  • Select RXT-X applications

Sea-Doo Wake

  • Sea-Doo Wake 155

  • Sea-Doo Wake Pro 215

  • Select Sea-Doo Wake Pro models

Sea-Doo FishPro

  • Sea-Doo FishPro Sport 170

  • Sea-Doo FishPro Trophy 170

Additional applications include select Sea-Doo models equipped with compatible Rotax 1503 and 1630 ACE engine packages.

Key Features

  • Genuine NGK DCPR8E spark plug

  • NGK stock number 4339

  • Proven application for Sea-Doo personal watercraft

  • Compatible with select Rotax 1503 4-TEC and 1630 ACE engines

  • Copper-core electrode provides efficient heat dissipation

  • Resistor construction helps reduce electronic interference

  • Promotes reliable starting and smooth acceleration

  • Helps maintain consistent combustion under varying engine loads

  • Excellent choice for seasonal maintenance and tune-ups

Built for Sea-Doo 4-TEC Performance

Sea-Doo 4-TEC engines depend on proper spark plug condition to deliver the smooth, responsive performance these watercraft are known for. Heat cycles, fuel deposits, and normal electrode wear eventually reduce ignition efficiency, making regular inspection and replacement an important part of preventative maintenance.

For compatible Sea-Doo GTI, GTX, RXP, RXT, Wake, Wake Pro, and FishPro models, the NGK DCPR8E 4339 provides dependable NGK quality and proven marine performance.

Fitment Note: Sea-Doo has used several engine families and spark plug specifications within the same model names. Spark gap can also vary by engine application. Always verify NGK DCPR8E / stock #4339 against your Sea-Doo model year, Rotax engine type, and original spark plug specification before ordering or setting the gap.