Champion QL78YC Marine Spark Plug 938M - Copper Core, Nickel Electrode, Bombardier 505449/505448/437929 Equivalent

The Champion QL78YC marine spark plug (938M) is an OE-type replacement plug built for dependable ignition performance in marine engines. It uses a copper core center electrode to increase conductivity and improve heat range control, which helps the plug resist overheating under heavy engine loads while extending electrode life. The ground electrode and center electrode tip are made of nickel, and the plug is built to conform with ISO and SAE standards for proven, repeatable performance.

This plug is engineered to resist fouling and offers strong corrosion resistance, making it well suited to the damp, high-load conditions typical of marine use. Its resistor design and flat seat type support consistent spark delivery and easier installation. The Champion QL78YC is a direct equivalent to select Bombardier outboard spark plugs, so buyers replacing an OEM Bombardier plug can cross to this part using the OEM numbers listed below.

Specifications

• Brand: Champion
• Manufacturer Part Number: CCH938M
• Champion Plug Number: 938M / QL78YC
• Product UPC: 037551005291
• Hex Size: 13/16 inch
• Preset Gap: 0.025 inch to 0.640 inch
• Thread Reach: 0.500 inch
• Electrical Terminal Type: Non-removable nut
• Ground Electrode Core Material: Nickel
• Center Electrode Tip Material: Nickel
• Center Electrode Core Material: Copper
• Weight: 0.15 pounds

Fitment

The Champion QL78YC (938M) is a direct equivalent to the Bombardier OEM spark plugs listed below. This plug is not compatible with the 1989 Johnson outboard motor.

Replaces (OEM)

• Bombardier 505449
• Bombardier 505448
• Bombardier 437929

Frequently Asked Questions

What is the Champion QL78YC spark plug also known as? This plug is also labeled 938M by Champion, and both numbers refer to the same Champion QL78YC marine spark plug.

Does this plug fit a 1989 Johnson outboard motor? No, the Champion QL78YC (938M) is specifically noted as not compatible with the 1989 Johnson outboard motor.

What OEM numbers does the QL78YC cross to? The Champion QL78YC (938M) is a direct equivalent to Bombardier OEM spark plug numbers 505449, 505448, and 437929.

What is the electrode material on this spark plug? The Champion QL78YC uses a copper core center electrode for conductivity, with a nickel ground electrode and a nickel center electrode tip for heat range control and wear resistance.

What is the hex size of the Champion QL78YC? The hex size on the Champion QL78YC (938M) marine spark plug is 13/16 inch.

What is the thread reach on this plug? Thread reach on the Champion QL78YC (938M) is 0.500 inch.

What is the preset electrode gap? The Champion QL78YC (938M) ships with a preset gap of 0.025 inch to 0.640 inch.

How much does the Champion QL78YC spark plug weigh? The Champion QL78YC (938M) weighs 0.15 pounds.

What terminal type does the QL78YC use? The Champion QL78YC (938M) has a non-removable nut electrical terminal type.

Is the Champion QL78YC resistant to fouling and corrosion? Yes, the Champion QL78YC (938M) is built to resist fouling and offers strong corrosion resistance for marine ignition systems.

Does the Champion QL78YC meet any industry standards? The Champion QL78YC (938M) is built to conform with ISO and SAE standards for proven performance and durability.

What is the UPC for the Champion QL78YC spark plug? The UPC for the Champion QL78YC (938M) marine spark plug is 037551005291.