Home / 1 Pack Denso 5378 Iridium Power Spark Plug IWF20
1 Pack Denso 5378 Iridium Power Spark Plug IWF20
$21.77
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The Denso 5378 Iridium Power Spark Plug (IWF20) is designed for compact engine applications requiring strong ignition performance in tight spaces. Featuring a fine-wire iridium electrode and 10mm thread size, it ensures reliable spark, enhanced combustion efficiency, and long-term durability—perfect for motorcycles, scooters, and small displacement engines.
Features & Benefits:
🔧 Slim-profile iridium tip delivers high-energy spark
🔧 Ideal for motorcycles and compact engine layouts
🔧 Resists fouling and supports consistent performance
🔧 Pre-gapped for quick, accurate installation
Specifications:
Brand & Part Number: Denso 5378 (IWF20)
Material: Iridium
Thread Size: 10mm
Reach: 19mm (0.75 in)
Hex Size: 14mm
Heat Range: 20
Seat Type: Gasket
Resistor: Yes
Gap: 0.6mm (0.024 in)
Equip your small engine with the Denso IWF20 Iridium Power plug—engineered for efficient combustion and lasting reliability!
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.
