NGK LFR5A-11 SPARK PLUG - 6376

NGK LFR5A-11 SPARK PLUG - 6376

  • Sale
  • $9.99
Shipping calculated at checkout.
Part Number: LFR5a11

NGK LFR5A-11 V-Power Spark Plug – 6376

The NGK LFR5A-11 V-Power Spark Plug, stock number 6376, is a proven replacement for select Yamaha, Mercury, and Mariner four-stroke outboard engines. Designed for dependable ignition under demanding marine conditions, this plug helps maintain quick starts, smooth idle quality, responsive acceleration, and consistent power throughout the RPM range.

NGK's V-Power design features a V-cut center electrode that positions the spark toward the edge of the firing surface, helping promote reliable ignition of the air-fuel mixture. A solid copper core provides efficient heat transfer, while the resistor construction helps reduce electrical interference with onboard electronics.

Spark plugs naturally accumulate deposits and electrode wear over time. Replacing them during scheduled maintenance can help correct hard starting, hesitation, intermittent misfires, rough running, and declining fuel efficiency. For compatible four-stroke outboards, the NGK 6376 provides a straightforward way to restore proper ignition performance.

Spark Plug Specifications

  • Manufacturer: NGK

  • Part Number: LFR5A-11

  • NGK Stock Number: 6376

  • Series: V-Power

  • Plug Type: Resistor

  • Center Electrode: Nickel alloy with copper core

  • Heat Range: 5

  • Thread Diameter: 14 mm

  • Thread Reach: 26.5 mm

  • Hex Size: 16 mm / 5/8"

  • Spark Gap: 1.1 mm / approximately .043–.044"

  • Projected firing tip

  • Sold Individually

Common Yamaha Engine Applications

The NGK LFR5A-11 / 6376 is specified for select Yamaha four-stroke outboards, including:

  • Yamaha F75 75 HP

  • Yamaha F80 80 HP

  • Yamaha F90 90 HP

  • Yamaha F95 95 HP

  • Yamaha F100 100 HP

  • Yamaha F150 150 HP

  • Yamaha LF150 150 HP Counter-Rotation

  • Yamaha F200 200 HP

  • Yamaha LF200 200 HP Counter-Rotation

  • Yamaha F225 225 HP

  • Yamaha LF225 225 HP Counter-Rotation

  • Yamaha F250 250 HP

  • Yamaha LF250 250 HP Counter-Rotation

Common applications include the F80 from 1999, F90 from the mid-2000s, F100, F150 beginning in 2004, and select F200/F225/F250 engines. Exact usage varies by model designation and production year.

Mercury & Mariner Engine Applications

NGK 6376 is also used in select Mercury and Mariner four-stroke engines, including:

  • Mercury 75 HP FourStroke

  • Mercury 90 HP FourStroke

  • Mercury 115 HP EFI FourStroke

  • Select Mercury 225 HP four-stroke applications

  • Mariner 75 HP Four-Stroke

  • Mariner 90 HP Four-Stroke

Some Mercury four-stroke engines from this period shared Yamaha-derived engine architecture, making the LFR5A-11 applicable to specific Mercury and Mariner power packages.

Common Boat Applications

Because these outboards were offered by numerous boat manufacturers, the NGK LFR5A-11 can be found in compatible engine packages installed on boats such as:

Grady-White

  • Grady-White Fisherman 180

  • Grady-White Fisherman 209

  • Grady-White Freedom 205

  • Grady-White Adventure 208

  • Grady-White Gulfstream 232

Key West

  • Key West 1720 Sportsman

  • Key West 189 FS

  • Key West 203 FS

  • Key West 219 FS

  • Key West 239 FS

Sea Hunt

  • Sea Hunt Triton 172

  • Sea Hunt Triton 188

  • Sea Hunt Triton 202

  • Sea Hunt Ultra 211

  • Sea Hunt Ultra 234

Carolina Skiff

  • Carolina Skiff J-Series

  • Carolina Skiff DLX Series

  • Carolina Skiff JVX Series

  • Carolina Skiff Sea Chaser models

Scout

  • Scout 175 Sportfish

  • Scout 195 Sportfish

  • Scout 205 Sportfish

  • Scout 210 XSF

  • Scout 222 Sportfish

Hurricane

  • Hurricane SunDeck 187

  • Hurricane SunDeck 217

  • Hurricane SunDeck 2200

  • Hurricane SunDeck Sport Series

Parker

  • Parker 1801 Center Console

  • Parker 21 SE

  • Parker 21 DV

  • Parker 23 SE

  • Parker 2320 Sport Cabin

Additional applications may include compatible Yamaha-powered Boston Whaler, Cobia, Skeeter, Pathfinder, Sportsman, Robalo, Tidewater, Sea Fox, Century, Sailfish, EdgeWater, Ranger, Stratos, and other fishing or recreational boats.

Yamaha & Mercury Cross References

Common reference numbers associated with this application include:

  • NGK LFR5A-11

  • NGK 6376

  • Yamaha LFR-5A110-00-00

  • Mercury 33-859495

Always confirm the OEM number and engine serial information before using a cross-reference for replacement.

Key Features

  • Genuine NGK LFR5A-11 V-Power spark plug

  • NGK stock number 6376

  • Popular replacement for Yamaha four-stroke outboards

  • Fits select Mercury and Mariner applications

  • V-cut electrode promotes dependable ignition

  • Copper core provides efficient heat dissipation

  • Resistor construction helps suppress electronic interference

  • 1.1 mm factory gap specification

  • Supports smooth starting and consistent acceleration

  • Ideal for seasonal maintenance and complete tune-ups

Dependable Ignition for Yamaha Four-Stroke Outboards

Yamaha four-stroke engines depend on the correct spark plug specification to deliver smooth power and reliable performance. Electrode wear, combustion deposits, and repeated heat cycles can eventually weaken ignition quality, making periodic replacement an important part of preventative maintenance.

Whether you're servicing a Yamaha F75, F80, F90, F100, F150, F200, F225, F250, or a compatible Mercury/Mariner four-stroke, the NGK LFR5A-11 Spark Plug – 6376 provides proven NGK quality for dependable performance on the water.

Fitment Note: Yamaha and Mercury have used different spark plug specifications within the same horsepower ranges as engine designs changed. Boat model and horsepower alone do not confirm compatibility. Verify NGK LFR5A-11 / stock #6376 against your engine model, production year, serial number, or original OEM spark plug before ordering.