Home / 4 NGK Spark Plugs - For Mercury 250 Outboard Motor
4 NGK Spark Plugs - For Mercury 250 Outboard Motor
$31.77
Free shipping on all orders.
Qty In Stock: 20
The NGK 6431 Spark Plug (BU8H) is specifically designed for marine and small engine applications, delivering reliable ignition and long-lasting performance in demanding environments. Built with a solid copper core and a short-thread design, it offers excellent heat dissipation, corrosion resistance, and consistent starts for outboard motors and watercraft.
Features & Benefits:
🔧 Copper core ensures strong spark and efficient thermal transfer
🔧 Corrosion-resistant materials ideal for marine use
🔧 Short-thread design fits compact engine configurations
🔧 Pre-gapped for fast, accurate installation
Specifications:
Brand & Part Number: NGK 6431 (BU8H)
Material: Nickel with Copper Core
Thread Size: 14mm
Reach: 9.5mm (3/8 in)
Hex Size: 13/16 in (20.8mm)
Heat Range: 8
Seat Type: Gasket
Resistor: No
Gap: 0.7mm (0.028 in)
Choose NGK BU8H for reliable marine engine performance, corrosion resistance, and dependable ignition—order now!
Shipping Info
Free shipping on every US order. In-stock parts typically ship within 1 business day from Texas.
Returns
30-day returns on unused parts in original packaging. Wrong or defective items are replaced or refunded. See the return policy.
How do I confirm this part fits?
Match the brand and part number to your vehicle, or use the Parts Finder on the homepage. Contact us before ordering if you are unsure.
Are these parts new?
Yes. TXN Supply Co sells new parts from trusted OEM-quality brands — not remanufactured cores.
How fast will my order ship?
In-stock orders ship within 1 business day. Delivery time depends on your ZIP; most US addresses arrive in 2–5 business days.
What is your return policy?
Unused items can be returned within 30 days in original packaging. Customer-initiated returns may include a restocking fee and return shipping.
Customer Reviews
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Great product..works perfectly..super fast shipping
— nehem....
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Thank you !!
— tyras....
