Engine & Drive Parts
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NGK Spark Plugs 4551 Spark Plug 4551
NGK Spark Plugs
$6.69 $4.52NGK 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...- Part Number:
- 41-BR9HS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4551
- Pack:
- 10
- Pkg.:
- Boxed
$6.69 $4.52 -
NGK Spark Plugs 4554 Spark Plug 4554
NGK Spark Plugs
$14.09 $7.86NGK 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...- Part Number:
- 41-R5671A8
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4554
- Pack:
- 4
$14.09 $7.86 -
NGK Spark Plugs 4623 Spark Plug 4623
NGK Spark Plugs
$6.69 $4.52NGK 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...- Part Number:
- 41-DR5HS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4623
- Pack:
- 10
- Pkg.:
- Boxed
$6.69 $4.52 -
NGK Spark Plugs 4644 Spark Plug Vpower 4644
NGK Spark Plugs
$6.99 $4.52NGK 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...- Part Number:
- 41-BKR7E
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4644
- Pack:
- 4
- Pkg.:
- Boxed
$6.99 $4.52 -
NGK Spark Plugs 4677 Spark Plug 4677
NGK Spark Plugs
$18.19 $9.85NGK 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...- Part Number:
- 41-BR9ECS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4677
- Pack:
- 10
- Pkg.:
- Boxed
$18.19 $9.85 -
NGK Spark Plugs 4695 Spark Plug 4695
NGK Spark Plugs
$6.39 $4.32NGK Spark Plugs 4695 Spark Plug 4695Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-CR4HSB
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4695
- Pack:
- 10
- Pkg.:
- Boxed
$6.39 $4.32 -
NGK Spark Plugs 4717 Spark Plug 4717
NGK Spark Plugs
$34.69 $18.93NGK Spark Plugs 4717 Spark Plug 4717- Part Number:
- 41-PMR9B
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4717
- Pack:
- 4
$34.69 $18.93 -
NGK Spark Plugs 4823 Spark Plug 4823
NGK Spark Plugs
$6.69 $4.52NGK Spark Plugs 4823 Spark Plug 4823Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-DR6HS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4823
- Pack:
- 10
- Pkg.:
- Boxed
$6.69 $4.52 -
NGK Spark Plugs 4922 Spark Plug 4922
NGK Spark Plugs
$6.79 $4.52NGK Spark Plugs 4922 Spark Plug 4922Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-BR6ES
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4922
- Pack:
- 4
- Pkg.:
- Boxed
$6.79 $4.52 -
NGK Spark Plugs 4929 Spark Plug 4929
NGK Spark Plugs
$6.59 $4.46NGK Spark Plugs 4929 Spark Plug 4929Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-DPR8EA9
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4929
- Pack:
- 10
- Pkg.:
- Boxed
$6.59 $4.46 -
NGK Spark Plugs 4952 Spark Plug 4952
NGK Spark Plugs
$6.39 $4.32NGK Spark Plugs 4952 Spark Plug 4952Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-BKR7ES11
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4952
- Pack:
- 4
- Pkg.:
- Boxed
$6.39 $4.32 -
NGK Spark Plugs 5129 Spark Plug 5129
NGK Spark Plugs
$6.69 $4.52NGK Spark Plugs 5129 Spark Plug 5129Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-DPR7EA9
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5129
- Pack:
- 10
- Pkg.:
- Boxed
$6.69 $4.52 -
NGK Spark Plugs 5469 Spark Plug 5469
NGK Spark Plugs
$6.39 $4.33NGK Spark Plugs 5469 Spark Plug 5469Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-DR7EB
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5469
- Pack:
- 10
- Pkg.:
- Boxed
$6.39 $4.33 -
NGK Spark Plugs 5531 Spark Plug 5531
NGK Spark Plugs
$6.69 $4.52NGK Spark Plugs 5531 Spark Plug 5531Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-DPR6EA9
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5531
- Pack:
- 10
- Pkg.:
- Boxed
$6.69 $4.52 -
NGK Spark Plugs 5534 Spark Plug 5534
NGK Spark Plugs
$6.69 $4.52NGK Spark Plugs 5534 Spark Plug 5534Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-BPR7ES
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5534
- Pack:
- 10
- Pkg.:
- Boxed
$6.69 $4.52 -
NGK Spark Plugs 5553 Spark Plug 5553
NGK Spark Plugs
$6.39 $4.33NGK Spark Plugs 5553 Spark Plug 5553Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-BKR6ES11
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5553
- Pack:
- 4
- Pkg.:
- Boxed
$6.39 $4.33 -
Sold Out, please call for ETA.
NGK Spark Plugs 5626 Spark Plug 5626
NGK Spark Plugs
$4.79 $2.45NGK Spark Plugs 5626 Spark Plug 5626Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-BUHW2
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5626
- Pack:
- 10
- Pkg.:
- Boxed
$4.79 $2.45 -
Sold Out, please call for ETA.
NGK Spark Plugs 5666 Spark Plug 5666
NGK Spark Plugs
$21.79 $14.09NGK Spark Plugs 5666 Spark Plug 5666Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-CR8EH9
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5666
- Pack:
- 10
- Pkg.:
- Boxed
$21.79 $14.09 -
On Sale
NGK Spark Plugs 5728 Spark Plug 5728
NGK Spark Plugs
$4.79 $1.86NGK Spark Plugs 5728 Spark Plug 5728Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-BMR4A
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5728
- Pack:
- 10
- Pkg.:
- Boxed
$4.79 $1.86 -
Sold Out, please call for ETA.
NGK Spark Plugs 5827 Spark Plug 5827
NGK Spark Plugs
$10.59 $9.25NGK Spark Plugs 5827 Spark Plug 5827Racing 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...- Part Number:
- 41-B9EGV
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5827
- Pack:
- 4
$10.59 $9.25
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.