Best Bosch Powersports Spark Plugs in 2026

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Better Performance

Good Brand Name NGK

G-Power Platinum

Designed to operate over a much wider heat range than ordinary plugs

Resists carbon buildup and pre-ignition

Often specified as original equipment, NGK spark plugs are the best combination of performance and longevity.

Offering the Quality, Reliability and Durability You'd Expect from an OEM Manufacturer

NGK is the world's largest supplier of OEM spark plugs

DENSO Unique Twin-Tip Structure

1.1mm platinum center electrode

360 Laser welding

Fit Type: Universal Fit

The Patented Diamondfire Ground Electrode Is Secured To The Shell With Two Legs To Help Facilitate Heat Transfer, And To Withstand The Intense Vibration Of Powersport Engine Applications

Improved Starts: Patented Edge-To-Edge Design Concentrates Spark Energy, Which Results In Quick And Easy Starts In Any Conditions

Revolutionary surface air gap firing technology featuring four yttrium-enhanced ground electrodes delivers the longest, most powerful spark for ultimate engine performance

Four yttrium-enhanced ground electrodes provide optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life

Electrode gap is factory set to provide ease of installation - never requires adjustment

Double Iridium electrodes - iridium firing pin and iridium ground electrode inlay - offer higher performance

OE-matched spark position for compatibility with Gasoline Direct Injection (GDI) technology

Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize for installation

Double Iridium firing pin and ground electrode inlay provide 4X longer service life compared to standard copper plugs

0.6mm fine wire firing pin provides superior ignitability and performance

360 Degree continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability

OE Type Copper Spark Plug

Sample Image Provided May Differ From Actual Product.

High performance engine spark plug for a variety of powersport applications, specifically designed to increase power, reduce fuel consumption, and improve hydrocarbon emissions

E3's patented DiamondFIRE edge-to-edge electrode provides maximum performance with increased efficiency, and a faster more complete burn

Proprietary electrode design presents multiple sharp edges to the center electrode providing maximum performance for longer life of this premium spark plug

Double Iridium firing pin and ground electrode inlay provide 4X longer service life compared to standard copper plugs

0.6mm fine wire firing pin provides superior ignitability and performance

360 Degree continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability. Torque Specs - Cast Iron - 11-18 Pounds. ft. Aluminum - 11-15 lb. feet

Fit most Stihl, Husqvarna, Poulan Equipment and more

Genuine Bosch WRS6F, WSR6F, 503235111, 11104007005, 00004007000, bpmr7a, rcj7y, 503235108

Stihl Part Number 1110 400 7005 can be replaced NGK-BPMR7A 0000 400 7000

Spark Plugs

Ignition Parts

Set Of Spark Plugs 6 PIECE

High performance engine spark plug for a variety of powersport applications, specifically designed to increase power, reduce fuel consumption, and improve hydrocarbon emissions

E3's patented DiamondFIRE edge-to-edge electrode provides maximum performance with increased efficiency, and a faster more complete burn

Proprietary electrode design presents multiple sharp edges to the center electrode providing maximum performance for longer life of this premium spark plug

Laser welded Platinum inlay ground electrode provides 3X longer service life compared to standard copper plugs

Fine wire Platinum firing pin for better ignitability and performance

Unique 360 continuous laser weld fuses corrosion resistant Platinum firing pin to base

FOR HIGH-PERFORMANCE ENGINES: Motorcycle spark plug for a variety of powersport applications, specifically designed to increase power, reduce fuel consumption, and improve hydrocarbon emissions

PATENTED TECHNOLOGY: DiamondFIRE ground electrode is secured to the shell with 2 legs that help facilitate optimal heat transfer and withstand the intense vibration of powersport engine applications

IMPROVED STARTS: Patented Edge-to-Edge design concentrates spark energy, which results in quick and easy starts in any conditions

High performance engine spark plug for a variety of powersport applications, specifically designed to increase power, reduce fuel consumption, and improve hydrocarbon emissions

E3's patented DiamondFIRE edge-to-edge electrode provides maximum performance with increased efficiency, and a faster more complete burn

Proprietary electrode design presents multiple sharp edges to the center electrode providing maximum performance for longer life of this premium spark plug

Brand New Bosch Spark Plug, Set of 8

OE #'s: 004 159 81 03, 004 159 25 03, 004 159 60 03, 004 159 63 03, 004 159 64 03

Bosch #: 0242140521, ZR6SII3320, 7430

Electrode Gap [mm]: 0,5

Number of Poles: 1

Outer thread [mm]: 14