Engine & Drive Parts
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NGK Spark Plugs 7411 Spark Plug 7411
NGK Spark Plugs
$15.89 $8.84NGK Spark Plugs 7411 Spark Plug 7411Chosen 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-CPR8E
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7411
- Pack:
- 10
- Pkg.:
- Boxed
$15.89 $8.84 -
Sold Out, please call for ETA.
NGK Spark Plugs 7421 Spark Plug 7421
NGK Spark Plugs
$6.29 $5.08NGK Spark Plugs 7421 Spark Plug 7421Chosen 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-BMR6A
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7421
- Pack:
- 10
- Pkg.:
- Boxed
$6.29 $5.08 -
NGK Spark Plugs 7502 Spark Plug 7502
NGK Spark Plugs
$21.79 $11.58NGK Spark Plugs 7502 Spark Plug 7502Chosen 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-CR9EH9
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7502
- Pack:
- 10
- Pkg.:
- Boxed
$21.79 $11.58 -
NGK Spark Plugs 7599 Spark Plug #7599
NGK Spark Plugs
$9.99 $6.11NGK Spark Plugs 7599 Spark Plug #7599Chosen 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-CMR5H
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7599
- Pack:
- 10
- Pkg.:
- Boxed
$9.99 $6.11 -
NGK Spark Plugs 7734 Spark Plug 7734
NGK Spark Plugs
$6.39 $4.33NGK Spark Plugs 7734 Spark Plug 7734Chosen 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-BPR5ES
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7734
- Pack:
- 4
- Pkg.:
- Boxed
$6.39 $4.33 -
Sold Out, please call for ETA.
NGK Spark Plugs 7784 Spark Plug 7784
NGK Spark Plugs
$14.79 $7.61NGK Spark Plugs 7784 Spark Plug 7784Chosen 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-CR8EB
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7784
- Pack:
- 10
- Pkg.:
- Boxed
$14.79 $7.61 -
NGK Spark Plugs 7823 Spark Plug 7823
NGK Spark Plugs
$6.39 $4.32NGK Spark Plugs 7823 Spark Plug 7823Chosen 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-BPR4HS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7823
- Pack:
- 10
- Pkg.:
- Boxed
$6.39 $4.32 -
NGK Spark Plugs 7839 Spark Plug 7839
NGK Spark Plugs
$6.69 $4.52NGK Spark Plugs 7839 Spark Plug 7839Chosen 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-DR7EA
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7839
- Pack:
- 10
- Pkg.:
- Boxed
$6.69 $4.52 -
NGK Spark Plugs 7901 Spark Plug 7901
NGK Spark Plugs
$30.69 $16.85NGK Spark Plugs 7901 Spark Plug 7901 Original equipment on many late model applications Iridium at the fine-wire center electrode and platinum at the ground electrode provides maximum...- Part Number:
- 41-IJR7A9
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7901
$30.69 $16.85 -
Sold Out, please call for ETA.
NGK Spark Plugs 7928 Spark Plug 7928
NGK Spark Plugs
$3.99 $2.04NGK Spark Plugs 7928 Spark Plug 7928Chosen 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-B10ES
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7928
- Pack:
- 4
- Pkg.:
- Boxed
$3.99 $2.04 -
NGK Spark Plugs 7938 Spark Plug 7938
NGK Spark Plugs
$7.09 $4.52NGK Spark Plugs 7938 Spark Plug 7938V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved.Lowers ignition system voltage...- Part Number:
- 41-BKR5E
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7938
- Pack:
- 4
- Pkg.:
- Boxed
$7.09 $4.52 -
NGK Spark Plugs 90537 Spark Plug V-Power 90537
NGK Spark Plugs
$18.12 $8.01NGK Spark Plugs 90537 Spark Plug V-Power 90537V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved.Lowers ignition system voltage...- Part Number:
- 41-LFR6A11BLYB
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 90537
- Pack:
- 6
- Pkg.:
- Blister
$18.12 $8.01 -
NGK Spark Plugs 92482 Spark Plug 92482
NGK Spark Plugs
$7.29 $4.37NGK Spark Plugs 92482 Spark Plug 92482Chosen 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-DPR6EA9BLYB
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 92482
- Pack:
- 6
- Pkg.:
- Blister
$7.29 $4.37 -
NGK Spark Plugs 95945 Spark Plug V-Power 95945
NGK Spark Plugs
$17.69 $8.41NGK Spark Plugs 95945 Spark Plug V-Power 95945V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved.Lowers ignition system voltage...- Part Number:
- 41-LFR5A11BLYB
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 95945
- Pack:
- 6
- Pkg.:
- Blister
$17.69 $8.41 -
NGK Spark Plugs Bpr5Es11 Sparkplug 7634
NGK Spark Plugs
$6.79 $4.52NGK Spark Plugs Bpr5Es11 Sparkplug 7634Chosen 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-BPR5ES11
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- BPR5ES-11
- Pack:
- 4
- Pkg.:
- Boxed
$6.79 $4.52 -
NGK Spark Plugs BPR7HS Spark Plug 6422
NGK Spark Plugs
$6.58 $4.09NGK Spark Plugs 6422 Spark Plug 6422 Standard spark plugs are chosen by more automotive, motorcycle and marine engine manufacturers than any other. The unique copper core and exclusive electrode...- Part Number:
- 41-6422
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 6422
- Pack:
- 10
- Pkg.:
- Boxed
$6.58 $4.09 -
NGK Spark Plugs BR8HS Spark Plug 4322
NGK Spark Plugs
$6.88 $4.09NGK Spark Plugs 4322 Spark Plug Br8Hs Standard spark plugs are chosen by more automotive, motorcycle and marine engine manufacturers than any other. The unique copper core and exclusive electrode...- Part Number:
- 41-4322
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4322
- Pack:
- 10
- Pkg.:
- Boxed
$6.88 $4.09 -
NGK Spark Plugs BR9EYA Spark Plug 7548
NGK Spark Plugs
$9.52 $6.09NGK Spark Plugs 7548 Spark Plug 7548 Standard spark plugs are chosen by more automotive, motorcycle and marine engine manufacturers than any other. The unique copper core and exclusive electrode...- Part Number:
- 41-7548
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7548
- Pack:
- 10
- Pkg.:
- Boxed
$9.52 $6.09 -
NGK Spark Plugs C7HSA Spark Plug 4629
NGK Spark Plugs
$6.51 $4.29NGK Spark Plugs C7HSA Spark Plug 4629 Standard spark plugs are chosen by more automotive, motorcycle and marine engine manufacturers than any other. The unique copper core and exclusive electrode...- Part Number:
- 41-4629
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4629
- Pack:
- 10
- Pkg.:
- Boxed
$6.51 $4.29 -
NGK Spark Plugs CPR7EA9 Spark Plug 3901
NGK Spark Plugs
$15.96 $8.89NGK Spark Plugs 3901 Spark Plug 3901 Chosen by more automotive, and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak...- Part Number:
- 41-3901
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3901
- Pack:
- 10
- Pkg.:
- Boxed
$15.96 $8.89
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.