Best Bosch Spark Plugs in 2026

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

FREE SHIPPING to anywhere IN USA and territories For This Item

Better Performance

Good Brand Name NGK

Sold in packs of 4

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

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

Iridium Spark Plug (8 Pack)

OE Type Copper Spark Plug

Sample Image Provided May Differ From Actual Product.

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

Trouble-free ignition

Easy start even in cold weather

Extended spark plug life

✪ 100% brand new and high-quality spark plug A7TC.

✪ Compatible with: NGK: C7HA, C7HSA, C5HA, C5HSA, C5HSB, CR5HS, CR5HSA, CR5HSB, C6HA, C6HSA, CR6HS, CR6HSA, CR7HSA. U22FS-U, U16FS-U, U16FS-UB, U16FSR-UB, U20FS-U, U20FSR-U, U22FSR-U. Champion: PZ7HS, Z9Y, Z10, Z10YC, Z12, Z8, Z9Y. AC S102F. Autolite: 2795. Bosch: UR3AS.

✪ For GY6 50cc-125cc horizontal engines. For 50cc-70cc 90cc 110cc 125cc 140cc 150cc 160cc engines. For most motorcycle, atv, quad, scooter, go kart, moped, chopper, buggy , pit bike, dirt bike, racing bike, mini bike and other bike.

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

Plugs easy to replace: factory-pre-set electrode gap, no adjustment necessary; Bosch advices not to lubricate the thread. Requested tightening torque or angle see on package

High reliabilty: excellent cold start behaviour

High wear resistance and robustness: special ceramic material with high dielectric and mechanical strength;

5118 PLZKAR6A-11 Spark Plug

Quality Assured

1 Pack

Electrode Gap [mm]: 0,5

Number of Poles: 1

Outer thread [mm]: 14

Plugs easy to replace: factory-pre-set electrode gap, no adjustment necessary, important instructions for installation, e.g. the correct tightening torque, can be found on the packaging, Bosch advises not to lubricate the thread

Start gardening season confident even after winter break: high reliability and excellent cold start behaviour

High wear resistance and robustness: special ceramic material with high dielectric and mechanical strength

EXTENDED CHANGE INTERVAL: The Autolite Iridium XP automotive replacement spark plug is engineered to last for up to 100,000 miles depending on engine type making it one of the most durable spark plugs on the market today

FUEL EFFICIENCY: These spark plugs utilize a 0.6mm finewire iridium centerwire tip design with laser welded technology for maximum fuel efficiency. Our finewire electrodes produce more focused and consistent ignitability resulting in less fuel consumption

OPTIMAL PERFORMANCE: This replacement iridium spark plug provides better durability and a more focused ignition for better overall ignitabilty and optimal performance

Single Quantity

No Core Charge Req.

Weight: 0.12lbs

Bosch contact set, ignition distributor for Mercedes Benz 1 237 013 027