Champion Copper Plus Marine Spark Plug 876M (QL16V) - OEM 502178/509924 Equivalent, 16mm Copper Core

The Champion Copper Plus Marine Spark Plug 876M (also designated QL16V) is a copper-core marine spark plug built as an OE-type replacement for outboard engines. Champion's Copper Plus line uses a copper core center electrode to deliver increased conductivity and accurate heat range control, helping the plug wear evenly over its service life while resisting fouling in marine ignition systems. The plug carries superior corrosion resistance and is engineered to resist overheating under the sustained heavy loads that outboard engines place on ignition components, supporting dependable, consistent firing.

This spark plug is built to conform with ISO and SAE standards, so it installs and performs as a proven, dependable replacement rather than a generic substitute. It uses a 16mm thread size and a metal-shell, copper-core construction, and is sold as a single spark plug (1 count). It carries Champion's own plug number 876M and is cataloged under the marine designation QL16V. For engines that call for OEM ignition parts numbered 502178 or 509924, the Champion 876M (QL16V) is the equivalent copper-core replacement. It is stocked in our Evinrude outboard spark plug category, making it a straightforward choice when replacing worn or fouled plugs on compatible outboard motors that specify a 16mm copper spark plug.

Specifications

• Brand: Champion
• Manufacturer Part Number: CCH876M
• Champion Spark Plug Number: 876M
• Product Line: Copper Plus
• Core Material: Copper
• Thread Size: 16 millimeters
• Top Material Type: Metal
• Unit Count: 1 spark plug
• Weight: 0.15 pounds
• UPC: 037551005178
• OEM Equivalent Part Number: 502178, 509924

Fitment

Stocked as an Evinrude outboard spark plug, the Champion 876M (QL16V) fits outboard engines that specify a 16mm copper-core marine spark plug carrying OEM equivalent numbers 502178 or 509924. Confirm your engine calls for one of these OEM numbers before ordering.

Replaces (OEM)

• 502178
• 509924

Frequently Asked Questions

What engines is the Champion 876M spark plug designed for? The Champion 876M (QL16V) is stocked as an Evinrude outboard spark plug and is intended for outboard engines that call for a 16mm copper-core marine spark plug carrying OEM equivalent numbers 502178 or 509924.

Does the 876M cross-reference to an OEM part number? Yes, the Champion 876M (QL16V) is an equivalent replacement for OEM numbers 502178 and 509924.

What is the difference between the 876M and QL16V designations? 876M and QL16V refer to the same Champion Copper Plus marine spark plug; 876M is Champion's own plug number and QL16V is the marine catalog designation for that same part.

What thread size does this spark plug use? The Champion 876M marine spark plug has a 16mm thread size.

Is the electrode on this plug copper or platinum? The Champion 876M (QL16V) uses a copper core center electrode rather than platinum or iridium, which gives strong conductivity and accurate heat range control.

How much does the Champion 876M spark plug weigh? This Champion Copper Plus marine spark plug weighs 0.15 pounds and ships as a single plug.

Is this a genuine Champion part or an aftermarket copy? The 876M (QL16V) is a genuine Champion Copper Plus spark plug, manufactured and sold as an OE-type replacement rather than a third-party clone.

Does this spark plug resist fouling in marine use? Yes, the copper core design of the Champion 876M is built to resist fouling and provide superior corrosion resistance in marine ignition systems.

How many spark plugs come in one order? One order of the Champion 876M (QL16V) includes a single spark plug (1 count).

What standards is the Champion 876M built to? The Champion 876M (QL16V) is built to conform with ISO and SAE standards for proven, dependable ignition performance.

Will the 876M hold up under heavy outboard engine loads? Yes, the Champion 876M (QL16V) is engineered to resist overheating under heavy outboard engine loads while maintaining dependable performance.

What is the UPC for the Champion 876M spark plug? The UPC for the Champion 876M (QL16V) marine spark plug is 037551005178.