Engine & Drive Parts
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NGK Spark Plugs 3961 Spark Plug Solid 3961
NGK Spark Plugs
$4.09 $0.00NGK Spark Plugs 3961 Spark Plug Solid 3961Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-BR8ESST
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3961
- Pack:
- 10
- Pkg.:
- Boxed
$4.09 $0.00 -
NGK Spark Plugs 3981 Spark Plug 3981
NGK Spark Plugs
$17.29 $9.36NGK Spark Plugs 3981 Spark Plug 3981Designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling.Fine-tipped iridium-center electrode ensures high durability and...- Part Number:
- 41-BR9EIX
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3981
- Pack:
- 4
$17.29 $9.36 -
NGK Spark Plugs 4043 Spark Plug 4043
NGK Spark Plugs
$6.19 $4.28NGK Spark Plugs 4043 Spark Plug 4043V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved.Lowers ignition system voltage requirementsIncreased fuel economyHigh durability resists electrical...- Part Number:
- 41-ZFR4F11
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4043
- Pack:
- 4
- Pkg.:
- Boxed
$6.19 $4.28 -
Sold Out, please call for ETA.
NGK Spark Plugs 4076 Spark Plug 4076
NGK Spark Plugs
$13.49 $9.25NGK Spark Plugs 4076 Spark Plug 4076Racing plugs feature a center electrode with a V-groove and a thicker ceramic shell for the high-heat applications in racing engines.Special center electrode designs and configurations to ensure durability and...- Part Number:
- 41-R6254K105
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4076
- Pack:
- 4
$13.49 $9.25 -
Sold Out, please call for ETA.
NGK Spark Plugs 4177 Spark Plug 4177
NGK Spark Plugs
$5.29 $3.84NGK Spark Plugs 4177 Spark Plug 4177V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved.Lowers ignition system voltage requirementsIncreased fuel economyHigh durability resists electrical...- Part Number:
- 41-TR6
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4177
- Pack:
- 4
- Pkg.:
- Boxed
$5.29 $3.84 -
Sold Out, please call for ETA.
NGK Spark Plugs 4210 Spark Plug 4210
NGK Spark Plugs
$4.09 $0.00NGK Spark Plugs 4210 Spark Plug 4210Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-B5HS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4210
- Pack:
- 4
- Pkg.:
- Boxed
$4.09 $0.00 -
Sold Out, please call for ETA.
NGK Spark Plugs 4253 Spark Plub 4253
NGK Spark Plugs
$24.49 $12.79NGK Spark Plugs 4253 Spark Plub 4253- Part Number:
- 41-PZFR7GG
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4253
- Pack:
- 4
$24.49 $12.79 -
NGK Spark Plugs 4291 Spark Plug 4291
NGK Spark Plugs
$6.19 $4.28NGK Spark Plugs 4291 Spark Plug 4291V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved.Lowers ignition system voltage requirementsIncreased fuel economyHigh durability resists electrical...- Part Number:
- 41-ZFR6F11
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4291
- Pack:
- 4
- Pkg.:
- Boxed
$6.19 $4.28 -
Sold Out, please call for ETA.
NGK Spark Plugs 4322 Spark Plug Br8Hs
NGK Spark Plugs
$4.09 $0.00NGK Spark Plugs 4322 Spark Plug Br8HsChosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-BR8HS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4322
- Pack:
- 10
- Pkg.:
- Boxed
$4.09 $0.00 -
NGK Spark Plugs 4522 Spark Plug 4522
NGK Spark Plugs
$5.89 $4.13NGK Spark Plugs 4522 Spark Plug 4522Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-BR9HS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4522
- Pack:
- 10
- Pkg.:
- Boxed
$5.89 $4.13 -
NGK Spark Plugs 4548 Spark Plug 4548
NGK Spark Plugs
$19.79 $10.26NGK Spark Plugs 4548 Spark Plug 4548Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-CR9EK
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4548
- Pack:
- 10
- Pkg.:
- Boxed
$19.79 $10.26 -
Sold Out, please call for ETA.
NGK Spark Plugs 4549 Spark Plug 4549
NGK Spark Plugs
$4.29 $0.00NGK Spark Plugs 4549 Spark Plug 4549Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-CR7HSA
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4549
- Pack:
- 10
- Pkg.:
- Boxed
$4.29 $0.00 -
NGK Spark Plugs 4551 Spark Plug 4551
NGK Spark Plugs
$5.89 $4.13NGK Spark Plugs 4551 Spark Plug 4551Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-BR9HS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4551
- Pack:
- 10
- Pkg.:
- Boxed
$5.89 $4.13 -
NGK Spark Plugs 4554 Spark Plug 4554
NGK Spark Plugs
$12.09 $6.73NGK Spark Plugs 4554 Spark Plug 4554Racing plugs feature a center electrode with a V-groove and a thicker ceramic shell for the high-heat applications in racing engines.Special center electrode designs and configurations to ensure durability and...- Part Number:
- 41-R5671A8
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4554
- Pack:
- 4
$12.09 $6.73 -
Sold Out, please call for ETA.
NGK Spark Plugs 4578 Spark Plug 4578
NGK Spark Plugs
$8.89 $0.00NGK Spark Plugs 4578 Spark Plug 4578Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-CR7E
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4578
- Pack:
- 10
- Pkg.:
- Boxed
$8.89 $0.00 -
NGK Spark Plugs 4623 Spark Plug 4623
NGK Spark Plugs
$5.89 $4.13NGK Spark Plugs 4623 Spark Plug 4623Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-DR5HS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4623
- Pack:
- 10
- Pkg.:
- Boxed
$5.89 $4.13 -
Sold Out, please call for ETA.
NGK Spark Plugs 4629 Spark Plug 4629
NGK Spark Plugs
$4.29 $0.00NGK Spark Plugs 4629 Spark Plug 4629Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-C7HSA
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4629
- Pack:
- 10
- Pkg.:
- Boxed
$4.29 $0.00 -
NGK Spark Plugs 4644 Spark Plug Vpower 4644
NGK Spark Plugs
$6.19 $4.21NGK Spark Plugs 4644 Spark Plug Vpower 4644V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved.Lowers ignition system voltage requirementsIncreased fuel economyHigh durability resists...- Part Number:
- 41-BKR7E
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4644
- Pack:
- 4
- Pkg.:
- Boxed
$6.19 $4.21 -
NGK Spark Plugs 4677 Spark Plug 4677
NGK Spark Plugs
$16.59 $8.41NGK Spark Plugs 4677 Spark Plug 4677Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-BR9ECS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4677
- Pack:
- 10
- Pkg.:
- Boxed
$16.59 $8.41 -
Sold Out, please call for ETA.
NGK Spark Plugs 4684 Spark Plug 4684
NGK Spark Plugs
$0.00NGK Spark Plugs 4684 Spark Plug 4684Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life.•?Triple gasket sealing process...- Part Number:
- 41-BR10ESSLD
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4684
- Pack:
- 10
- Pkg.:
- Boxed
$0.00
Spark Plugs for Power Boats
Keep your engine performing at its best with high-quality boat spark plugs designed for outboards, inboards, and sterndrives. At PowerBoatSupply.com, we carry a full selection of NGK spark plugs, AC Delco spark plugs, and other trusted marine brands to fit a wide variety of engines. Whether you’re replacing a single spark plug for a boat motor or outfitting an entire set, you’ll find durable, OEM-recommended options that deliver reliable ignition, smooth starts, and long-lasting performance on the water.
Why Spark Plugs Matter for Marine Engines
Spark plugs are a small but critical part of your boat’s ignition system. They provide the spark that ignites the fuel-air mixture, powering your engine forward. Worn or fouled boat motor spark plugs can lead to misfires, poor fuel economy, hard starts, or even engine damage. That’s why routine replacement with the right spark plug type is essential for keeping your boat running smoothly all season long.
Our Spark Plug Selection
We stock a wide range of marine spark plugs to cover all your needs, including:
- Standard spark plugs – affordable and dependable for routine use
- V-Power spark plugs – improved ignitability for better performance
- Iridium spark plugs – advanced durability and longer service life
- OEM-specific plugs – designed to fit Mercury, MerCruiser, and other popular marine engines
From Mercury outboards to MerCruiser sterndrives, our inventory includes the correct Mercury boat motor spark plugs to keep your engine running at peak efficiency.
When to Replace Your Spark Plugs
Most marine experts recommend inspecting and replacing spark plugs every season, or at least every 100 hours of operation. Signs that your plugs need replacement include difficulty starting, engine hesitation, reduced fuel efficiency, or visible carbon buildup on the electrodes. Swapping them out regularly is an inexpensive way to protect your boat engine and prevent costly repairs.
Shop Spark Plugs Online With Confidence
PowerBoatSupply.com makes it easy to find the exact boat spark plugs you need. With fast shipping, competitive pricing, and our decades of marine parts experience, we’re your trusted source for boat motor spark plugs and engine tune-up parts. Order today and get back on the water with confidence.