NGK CR8EH-9 Spark Plug (NGK5666)

$15.49

NGK CR8EH-9 spark plug for various makes and models. Please see Supported Models tab for a list of vehicle applications.

NGK traditional plugs are constructed for longer life and optimum performance. Corrugated ribs prevent flashover. NGK uses only the purest alumina silicate in its ceramic insulator which give all NGK plugs greater strength and better heat transfer. Copper cored and triple sealed to further aid in heat removal and prevent interior leakage.

NGK5666
Thread Size: 10mm
Reach: 19mm (3/4 inch)
Hex Size: 16mm (5/8 inch)
Half Thread Type: 12.7mm (1/2 inch) threaded
Gap: 0.9mm (.035 inch)
Heat Range: 8
Does not include terminal nut

Supported Models

HONDA 1990-1989 CB400F CB-1, HONDA 1990-1989 VTR250, HONDA 1997-1995 VF750CD, HONDA 2002-1991 ST1100, HONDA 2002-1992 ST1100A, HONDA 2002-1994 VF750C Magna, HONDA 2003-2012 CHF50/P Metropolitan I & II Scooter, HONDA 2006-2002 CB900F, HONDA 2006-2003 NPS50 Ruckus, HONDA 2006-2003 ST1300, ST1300P, HONDA 2007 NPS50/S Ruckus, HONDA 2007-2002 FSC600 Silver Wing Scooter, HONDA 2007-2006 CHF50 Metropolitan, HONDA 2007-2006 CHF50/S Metropolitan, Honda Metropolitan (CHF50), Honda Ruckus 50 (NPS50), Various unlisted makes/models

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Frequently Asked Questions

When will my order be shipped and how long does delivery take?

Orders containing in-stock items typically ship within 3–5 business days. Orders that include assembly will require 7–10 business days to prepare. Please note that during the holiday season (Thanksgiving through Christmas), processing times may be longer due to high order volume. Once your order has shipped, you’ll receive an email with tracking information. Most orders are shipped via Less Than Truckload (LTL) freight and generally arrive within 3–7 business days. Deliveries to remote areas (such as mountains, forests, valleys, or islands) may take longer. You can check the estimated delivery date on the carrier’s website using the tracking number we provide.

How your vehicle is shipped?

Unless otherwise noted, the vehicles we offer are shipped crated or on a pallet and do not come assembled unless you’ve selected our assembly service. Assembly typically requires a few basic tools and mechanical knowledge. If you're not confident in your ability to safely assemble a high-speed off-road vehicle, we strongly recommend selecting professional assembly or having it assembled by a local mechanic.

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Do you offer financing?

Yes. Buy-now-pay-later financing is available with our preferred partner, BreadPay® (please see their icon under product pricing for details).

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How can I get assistance if I have question on products?

Please call 888-886-5846 and talk to one of our knowledgeable sales representatives between 9am-3pm PST. Or send us email at orders@gokartsusa.biz.

What warranty is included with my purchase?

You're covered with confidence at GoKarts USA®. Your satisfaction is our top priority. Every purchase comes with manufacturer-backed warranty protection—including up to 12 months of engine coverage—to keep your ride running strong. TrailMaster products also include a 6-month parts warranty for added peace of mind.

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What does 95% or 98% Assembly Mean? What do I need to assemble if shipped in crate?

For shipping safety, most vehicles cannot be fully assembled prior to delivery.

Minor assembly is required—this typically includes installing mirrors, connecting the battery, adjusting handlebars, and other small components. Before operation, please ensure all screws and fasteners are tightened, engine fluids are at proper levels, and the battery is fully charged. Your factory warranty remains valid right out of the box.

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NGK CR8EH-9 Spark Plug (NGK5666)

Frequently Asked Questions

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