Engine & Drive Parts
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NGK Spark Plugs 4495 Spark Plug 4495
NGK Spark Plugs
$17.79 $9.64NGK Spark Plugs 4495 Spark Plug 4495 Chosen 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...- Part Number:
- 41-BPZ8HN10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4495
- Pkg.:
- Boxed
- What's in the Box:
- 10
$17.79 $9.64 -
Sold Out, please call for ETA.
NGK Spark Plugs 6546 Spark Plug Iridium 6546
NGK Spark Plugs
$17.29 $9.39NGK Spark Plugs 6546 Spark Plug Iridium 6546 Designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling. Fine-tipped iridium-center electrode ensures high...- Part Number:
- 41-DCPR8EIX
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 6546
- What's in the Box:
- (1) Spark Plug
$17.29 $9.39 -
NGK Spark Plugs 5887 Spark Plug 5887
NGK Spark Plugs
$29.29 $14.74NGK Spark Plugs 5887 Spark Plug 5887 Original equipment on many late model applications Iridium at the fine-wire center electrode and platinum at the ground electrode provides maximum durability and performance The platinum at the ground...- Part Number:
- 41-IZFR5G
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5887
- What's in the Box:
- (1) Spark Plug
$29.29 $14.74 -
NGK Spark Plugs B8Hs-10 Spark Plug 5126
NGK Spark Plugs
$5.89 $4.13NGK Spark Plugs B8Hs-10 Spark Plug 5126 Chosen 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...- Part Number:
- 41-B8HS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5126
- Pkg.:
- Boxed
- What's in the Box:
- 4
$5.89 $4.13 -
Sold Out, please call for ETA.
NGK Spark Plugs 3478 Spark Plug 3478
NGK Spark Plugs
$16.99 $9.16NGK Spark Plugs 3478 Spark Plug 3478 Chosen 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...- Part Number:
- 41-CR8EK
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3478
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$16.99 $9.16 -
NGK Spark Plugs 6499 Spark Plug LFR4AE Mercury 8m0157328
NGK Spark Plugs
$11.79 $6.72NGK Spark Plugs 6499 Spark Plug LFR4AE Mercury 8m0157328 Chosen 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...- Part Number:
- 41-6499
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 6499
- What's in the Box:
- (1) Spark Plug
$11.79 $6.72 -
NGK Spark Plugs Bp8Hs-10 Spark Plug 3823
NGK Spark Plugs
$5.89 $4.13NGK Spark Plugs Bp8Hs-10 Spark Plug 3823 Chosen 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...- Part Number:
- 41-BP8HS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3823
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$5.89 $4.13 -
NGK Spark Plugs 7397 Spark Plug Iridium 7397
NGK Spark Plugs
$17.29 $9.36NGK Spark Plugs 7397 Spark Plug Iridium 7397 Designed specifically for the performance enthusiast. Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling. Fine-tipped iridium-center electrode ensures high...- Part Number:
- 41-TR5IX
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 7397
- What's in the Box:
- (1) Spark Plug
$17.29 $9.36 -
Sold Out, please call for ETA.
NGK Spark Plugs 1134 Spark Plug 1134
NGK Spark Plugs
$3.99 $2.41NGK Spark Plugs 1134 Spark Plug 1134 Chosen 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...- Part Number:
- 41-BR8HS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 1134
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$3.99 $2.41 -
NGK Spark Plugs 3133 Spark Plug 3133
NGK Spark Plugs
$18.09 $9.64NGK Spark Plugs 3133 Spark Plug 3133 Chosen 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...- Part Number:
- 41-BPZ8HS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3133
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$18.09 $9.64 -
NGK Spark Plugs Bkr5Es Spark Plug 2460
NGK Spark Plugs
$5.49 $3.61NGK Spark Plugs Bkr5Es Spark Plug 2460 Chosen 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...- Part Number:
- 41-BKR5ES
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 2460
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$5.49 $3.61 -
NGK Spark Plugs Bkr7Eku Spark Plug 5881
NGK Spark Plugs
$16.59 $8.43NGK Spark Plugs Bkr7Eku Spark Plug 5881 Chosen 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...- Part Number:
- 41-BKR7EKU
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 5881
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$16.59 $8.43 -
NGK Spark Plugs 4214 Spark Plug Iridium 4214
NGK Spark Plugs
$29.29 $14.74NGK Spark Plugs 4214 Spark Plug Iridium 4214 Original equipment on many late model applications Iridium at the fine-wire center electrode and platinum at the ground electrode provides maximum durability and performance The platinum at the...- Part Number:
- 41-IZFR7M
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4214
- What's in the Box:
- (1) Spark Plug
$29.29 $14.74 -
NGK Spark Plugs 1157 Spark Plug 1157
NGK Spark Plugs
$14.99 $8.09NGK Spark Plugs 1157 Spark Plug 1157 Chosen 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...- Part Number:
- 41-BR8HCS10
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 1157
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$14.99 $8.09 -
NGK Spark Plugs 2238 Spark Plug 2238
NGK Spark Plugs
$6.29 $4.08NGK Spark Plugs 2238 Spark Plug 2238 V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved. Lowers ignition system voltage requirements Increased fuel economy High durability resists...- Part Number:
- 41-TR5
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 2238
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$6.29 $4.08 -
NGK Spark Plugs 2623 Spark Plug 2623
NGK Spark Plugs
$5.89 $4.13NGK Spark Plugs 2623 Spark Plug 2623 Chosen 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...- Part Number:
- 41-BPR6FS
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 2623
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$5.89 $4.13 -
NGK Spark Plugs 3951 Spark Plug 3951
NGK Spark Plugs
$6.29 $4.08NGK Spark Plugs 3951 Spark Plug 3951 V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved. Lowers ignition system voltage requirements Increased fuel economy High durability resists...- Part Number:
- 41-TR55
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 3951
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$6.29 $4.08 -
NGK Spark Plugs 4095 Spark Plug Iridium 4095
NGK Spark Plugs
$29.29 $14.74NGK Spark Plugs 4095 Spark Plug Iridium 4095 Original equipment on many late model applications Iridium at the fine-wire center electrode and platinum at the ground electrode provides maximum durability and performance The platinum at the...- Part Number:
- 41-IZFR6F11
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 4095
- What's in the Box:
- (1) Spark Plug
$29.29 $14.74 -
NGK Spark Plugs 6208 Spark Plug 6208
NGK Spark Plugs
$9.29 $5.37NGK Spark Plugs 6208 Spark Plug 6208 Chosen 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...- Part Number:
- 41-LR8B
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 6208
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$9.29 $5.37 -
NGK Spark Plugs 6630 Spark Plug 6630
NGK Spark Plugs
$6.29 $4.08NGK Spark Plugs 6630 Spark Plug 6630 V-Power plugs offer economical performance and improved ignitability over nickel spark plugs. OEM and racer approved. Lowers ignition system voltage requirements Increased fuel economy High durability resists...- Part Number:
- 41-UR4
- Availability:
- In Stock - Ships same or next business day.
- Model #:
- 6630
- Pkg.:
- Boxed
- What's in the Box:
- (1) Spark Plug
$6.29 $4.08
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.