Champion Spark Plugs

Champion UL77V Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion UL77V Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 831

Frequently Asked Questions

• What is the Champion UL77V Marine Spark Plug used for? The Champion UL77V Marine Spark Plug is a quality OEM replacement marine spark plug. It features a copper core electrode designed to provide increased conductivity and heat control, supporting good overall wear and resistance to overheating under heavy engine loads.
• What features does the Champion UL77V Spark Plug offer? The Champion UL77V Spark Plug is designed to resist fouling and provide superior corrosion resistance. Its copper core electrode provides increased conductivity and heat control, while the spark plug is designed for dependable and proven performance and good overall wear.
• How does the copper core electrode benefit the Champion UL77V Spark Plug? The copper core electrode in the Champion UL77V Spark Plug provides increased conductivity and heat control. These characteristics are designed to support good overall wear and help the marine spark plug resist overheating under heavy engine loads.
• Is the Champion UL77V Spark Plug designed for heavy engine loads? Yes. The Champion UL77V Spark Plug is designed to resist overheating under heavy engine loads. Its copper core electrode provides heat control and increased conductivity, supporting good overall wear during operation.
• What is the Champion part number for the UL77V Marine Spark Plug? The Champion UL77V Marine Spark Plug is identified as Champion Spark Plug #831. Verify this part number against the applicable engine or equipment information before purchasing to confirm that it is the correct replacement.

Champion UL18V Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion UL18V Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champ Spark Plug # 824

Application:

Force

125 HP

85 HP

Prestolite Ignition 120 HP

Prestolite Ignition 150 HP

Prestolite Ignition 50 HP

Prestolite Ignition 90 HP

Frequently Asked Questions

• What is the Champion UL18V Marine Spark Plug? The Champion UL18V Marine Spark Plug is a quality OEM replacement featuring a copper core electrode that provides increased conductivity and heat control for good overall wear. It is also designed to resist fouling, provide superior corrosion resistance, and resist overheating under heavy engine loads.
• What Force engines is the Champion UL18V Marine Spark Plug designed for? The Champion UL18V Marine Spark Plug is listed for Force applications including 125 HP and 85 HP engines, as well as 120 HP, 150 HP, 50 HP, and 90 HP applications with Prestolite ignition.
• How does the copper core electrode benefit the Champion UL18V Spark Plug? The copper core electrode provides increased conductivity and heat control for good overall wear. This design is part of the Champion UL18V Spark Plug's construction for dependable and proven performance.
• Is the Champion UL18V Marine Spark Plug designed to resist fouling and corrosion? Yes. The Champion UL18V Marine Spark Plug is designed to resist fouling and provide superior corrosion resistance. These features are combined with its copper core electrode and heat control characteristics for marine spark plug performance.
• What is the Champion part number for the UL18V Marine Spark Plug? The Champion part number for the UL18V Marine Spark Plug is 824. The product description identifies it as Champ Spark Plug #824.

Champion RV9YC Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RV9YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 400

Champion RV91MC Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RV91MC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 942M

Champion RV8C Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RV8C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 121

Frequently Asked Questions

• What is the Champion RV8C Copper Plus Marine Spark Plug? The Champion RV8C Copper Plus Marine Spark Plug is a quality OEM replacement featuring a copper core electrode. The electrode provides increased conductivity and heat control, while the Copper Plus design is intended to provide dependable performance and accurate heat range control for longer life.
• How does the copper core electrode benefit the Champion RV8C Spark Plug? The copper core electrode provides increased conductivity and heat control while allowing accurate control of the spark plug's heat range. According to the product description, this design supports good overall wear and longer life.
• How does the Champion RV8C Marine Spark Plug resist corrosion? The Champion RV8C Marine Spark Plug features a patented TinTac and ULTRASEAL coated shell designed for maximum corrosion resistance. This coating is part of the plug's construction for marine applications.
• Does the Champion RV8C Spark Plug provide EMI and RFI suppression? Yes. The Champion RV8C Spark Plug features a patented SAC-9 semiconductor designed for maximum electromagnetic interference (EMI) and radio-frequency interference (RFI) suppression.
• What standards does the Champion RV8C Copper Plus Marine Spark Plug meet? The Champion RV8C Copper Plus Marine Spark Plug is built to ISO and SAE standards. The product description identifies these standards as supporting proven performance.
• What is the Champion part number for the RV8C Marine Spark Plug? The Champion part number for the RV8C Marine Spark Plug is 121. The product description identifies it as Champion Spark Plug #121.

Champion RV15YC4 Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RV15YC4 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 18

Interchangeable with:

Mercury Marine

33-896329018

Johnson/Evinrude

0765904

0765846

0772347

3854400

Frequently Asked Questions

• What is the Champion RV15YC4 Copper Plus Marine Spark Plug? The Champion RV15YC4 Copper Plus Marine Spark Plug is a quality OEM replacement featuring a copper core electrode for increased conductivity and heat control. It is designed to provide dependable performance, resist overheating under heavy engine loads, and promote good overall wear.
• What are the benefits of the copper core electrode in the Champion RV15YC4? The copper core electrode allows for accurate control of the spark plug's heat range, which supports longer life. It also provides increased conductivity and heat control for good overall wear and dependable performance in marine applications.
• How does the Champion RV15YC4 resist corrosion? The Champion RV15YC4 features a patented TinTac and ULTRASEAL coated shell designed to provide maximum corrosion resistance. This construction is intended to help the marine spark plug withstand corrosion while delivering dependable performance.
• Does the Champion RV15YC4 provide EMI and RFI suppression? Yes. The Champion RV15YC4 features a patented SAC-9 semiconductor designed for maximum electromagnetic interference (EMI) and radio-frequency interference (RFI) suppression.
• What spark plugs are interchangeable with the Champion RV15YC4? The Champion RV15YC4 is listed as interchangeable with Mercury Marine part number 33-896329018 and Johnson/Evinrude part numbers 0765904, 0765846, 0772347, and 3854400. Verify the applicable part number for your engine before installation.
• What is the Champion part number for the RV15YC4 Spark Plug? The Champion RV15YC4 Copper Plus Marine Spark Plug is identified as Champion Spark Plug number 18. It is built to ISO and SAE standards for proven performance.

Champion RV12YC Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RV12YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 406

Champion RS9YC Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RS9YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 304

Champion RS12YC Copper Plus Marine Spark Plugs

Champion marine spark plugs are quality OEM replacements. The Champion RS12YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 401

Frequently Asked Questions

• What is the Champion RS12YC Copper Plus Marine Spark Plug? The Champion RS12YC Copper Plus Marine Spark Plug is a quality OEM replacement designed for marine applications. It features a copper core electrode for increased conductivity and heat control and is designed to provide dependable performance while resisting overheating under heavy engine loads.
• How does the copper core electrode benefit the Champion RS12YC? The copper core electrode provides increased conductivity and allows for accurate control of the spark plug's heat range. This helps promote good overall wear and supports longer spark plug life while providing dependable performance.
• How does the Champion RS12YC resist corrosion? The Champion RS12YC features a patented TinTac and ULTRASEAL coated shell designed for maximum corrosion resistance. This construction is intended to provide protection against corrosion for dependable performance in marine applications.
• Does the Champion RS12YC provide EMI and RFI suppression? Yes. The Champion RS12YC features a patented SAC-9 semiconductor designed for maximum electromagnetic interference (EMI) and radio-frequency interference (RFI) suppression.
• What standards does the Champion RS12YC Copper Plus Marine Spark Plug meet? The Champion RS12YC Copper Plus Marine Spark Plug is built to ISO and SAE standards for proven performance. It combines a copper core electrode with corrosion-resistant shell coatings and a SAC-9 semiconductor for EMI and RFI suppression.
• What is the Champion part number for the RS12YC Marine Spark Plug? The Champion RS12YC Copper Plus Marine Spark Plug is identified as Champion Spark Plug number 401.

Champion 415 RN9YC Copper Plus Marine Spark Plug

The Champion 415 RN9YC Copper Plus Marine Spark Plug is a standard replacement spark plug for compatible marine engine applications requiring an RN9YC plug. Its copper core center electrode provides reliable conductivity and helps maintain accurate heat control for consistent performance and wear.

This resistor-type spark plug features a nickel-copper alloy ground electrode and Champion's corrosion-resistant TinTac and ULTRASEAL shell coatings. The flat-seat design uses an included crush washer, while the removable terminal nut accommodates compatible ignition connections.

Product Features

Champion Copper Plus standard replacement spark plug

Copper core center electrode supports conductivity and heat control

Resistor design helps suppress electromagnetic and radio-frequency interference

Nickel-copper alloy ground electrode with a single-electrode design

TinTac and ULTRASEAL shell coatings help resist corrosion

Flat seat with included crush washer

Removable terminal nut

Built to applicable ISO and SAE performance standards

Spark Plug Specifications

Champion Part Number: 415

Plug Type: RN9YC

Manufacturer Heat Range: 9

Pre-Gap: 0.032 in. (0.82 mm)

Thread Diameter: 14 mm

Reach: 0.750 in.

Hex Size: 0.813 in. (20.65 mm)

Seat Type: Flat

Resistor Plug: Yes

Ground Electrode Quantity: 1

Fitment Note: Spark plug requirements and installed gap can vary by engine. Verify RN9YC compatibility and the required spark plug gap using the engine manufacturer's service information before installation.

Frequently Asked Questions

• What is the Champion 415 RN9YC Copper Plus Marine Spark Plug used for? The Champion 415 RN9YC Copper Plus Marine Spark Plug is a standard replacement spark plug for compatible marine engine applications requiring an RN9YC plug. Its copper core center electrode provides conductivity and heat control, while the resistor design helps suppress electromagnetic and radio-frequency interference.
• What is the correct gap for the Champion 415 RN9YC Spark Plug? The Champion 415 RN9YC Spark Plug has a listed pre-gap of 0.032 inches (0.82 mm). However, the required installed gap can vary by engine. Verify the correct spark plug gap using the engine manufacturer's service information before installation rather than assuming the listed pre-gap is the required setting.
• What are the specifications of the Champion 415 RN9YC Marine Spark Plug? The Champion 415 RN9YC has a manufacturer heat range of 9, 14 mm thread diameter, 0.750-inch reach, and 0.813-inch (20.65 mm) hex size. It has a flat seat, one ground electrode, a resistor design, and a listed pre-gap of 0.032 inches (0.82 mm).
• Does the Champion 415 RN9YC Spark Plug include a crush washer? Yes. The Champion 415 RN9YC Copper Plus Marine Spark Plug uses a flat-seat design with an included crush washer. It also has a removable terminal nut for compatible ignition connections.
• Is the Champion 415 RN9YC Spark Plug corrosion resistant? The Champion 415 RN9YC features TinTac and ULTRASEAL shell coatings that help resist corrosion. It also uses a nickel-copper alloy ground electrode. These features are part of the spark plug's specified construction for compatible marine engine applications.
• How do I verify that the Champion 415 RN9YC is the correct spark plug for my marine engine? Verify that your engine requires an RN9YC spark plug and confirm the required spark plug gap using the engine manufacturer's service information before installation. Spark plug requirements and installed gap can vary by engine, so the supplied specifications should not be used as a substitute for engine-specific service information.

Champion RN5C Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RH12 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 123

Champion RN2C Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RN2C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 818

Champion RN12YC Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RN12YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 404

Champion RN11YC4 Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RN11YC4 Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 322

Application:

Honda

BF5 OHV, 4-Stroke 5HP

BF50 OHV, 4-Stroke 5HP

Champion RJ8C Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RJ8C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 871

Champion RJ6C Copper Plus Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RJ6C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Copper Plus for dependable performance

Copper core electrode allows for accurate control of heat range for longer life

Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance

Patented SAC-9 semiconductor for maximum EMI & RFI suppression.

Built to ISO and SAE standards for proven performance.

Champion Spark Plug # 102

Champion RJ12C Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RJ12C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 592

Champion Spark Plugs

Champion RA8HC Spark Plug 810

The 810 Spark Plug provides increased conductivity and heat control for goof overall wear by its star feature copper core electrode. The 810 is known for its dependable performance and durability. The spark plug provides superior corrosion resistance and resists fouling.

Interchangeable with:

Mercury

883323001

Frequently Asked Questions

• What is the Champion RA8HC Spark Plug 810? The Champion RA8HC Spark Plug 810 is a marine spark plug featuring a copper core electrode designed to provide increased conductivity and heat control for good overall wear. It is also designed to provide dependable performance and durability while offering corrosion resistance and fouling resistance.
• What are the benefits of the copper core electrode in the Champion RA8HC? The copper core electrode in the Champion RA8HC provides increased conductivity and heat control. These features help promote good overall wear while supporting the spark plug's dependable performance and durability.
• Does the Champion RA8HC Spark Plug resist corrosion and fouling? Yes. The Champion RA8HC Spark Plug is designed to provide superior corrosion resistance and resist fouling. These characteristics support dependable performance and durability in its intended application.
• What Mercury part number is interchangeable with the Champion RA8HC Spark Plug? The Champion RA8HC Spark Plug 810 is listed as interchangeable with Mercury part number 883323001. Verify the applicable part number for your engine before purchasing or installing the spark plug.
• What is the Champion part number for the RA8HC Spark Plug? The Champion RA8HC Spark Plug is identified as Champion Spark Plug number 810. It features a copper core electrode and is designed for dependable performance, durability, corrosion resistance, and fouling resistance.

Champion RA6HC Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion RA6HC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 809

Application:

Honda

BF20A OHC, 4-Stroke 20 HP

Champion QL86C Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion QL86C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 933M

Application:

Yamaha

F2.5 1 cyl. 4-Stroke 2.5 HP

F8 2 cyl. L2 4-Stroke 8 HP 197cc

F9.9 2 cyl. L2 4-Stroke 9.9HP 212cc

T8 2 cyl. L2 4-Stroke 8 HP 197cc

T9.9 2 cyl. L2 4-Stroke 9.9 HP 212cc

Champion QL82YC Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion QL82YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 932M

Champion QL82C Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion QL82C Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. These marine spark plugs are designed to resist overheating under heavy engine loads.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion Spark Plug # 931M

Frequently Asked Questions

• What is the Champion QL82C Marine Spark Plug? The Champion QL82C Marine Spark Plug is a quality OEM replacement spark plug designed for marine applications. It features a copper core electrode that provides increased conductivity and heat control for good overall wear and is designed to resist overheating under heavy engine loads.
• What are the benefits of the Champion QL82C Spark Plug? The Champion QL82C is designed to resist fouling and provide superior corrosion resistance. Its copper core electrode helps provide increased conductivity and heat control, while the spark plug is built for dependable and proven performance in marine applications.
• How does the copper core electrode in the Champion QL82C work? The copper core electrode in the Champion QL82C provides increased conductivity and heat control. These characteristics help promote good overall wear and support reliable spark plug operation in marine applications.
• Is the Champion QL82C Spark Plug designed for heavy engine loads? Yes. The Champion QL82C Marine Spark Plug is designed to resist overheating under heavy engine loads. It also provides heat control through its copper core electrode for good overall wear.
• What is the Champion part number for the QL82C Marine Spark Plug? The Champion QL82C Marine Spark Plug is identified as Champion Spark Plug number 931M.

Champion QL78YC Marine Spark Plug

Champion marine spark plugs are quality OEM replacements. The Champion QL78YC Spark Plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. It has been built to conform with ISO and SAE standards and provides dependable performance as well as durability. This OE type replacement plug resists fouling and offers exceptional corrosion resistance. The nickel copper alloy electrode at its core allows accurate heat range control for a longer life. Its resistor and flat head seat types are responsible for its enhanced performance. These marine spark plugs are designed to resist overheating under heavy engine loads.

NOTE: The Champion QL78YC Spark Plug is NOT compatible with the 1989 Johnson outboard motor. To find the best plug for these types of engines, use our Parts Finder located at the top of the Johnson Outboard Parts page.

Resists fouling

Superior corrosion resistance

Dependable and proven performance

Increased conductivity and heat control for good overall wear

Champion QL78YC Spark Plug

Specifications:

Hex size: 13/16"

Preset Gap: 0.025" - 0.640"

Thread Reach: 0.500"

Electrical Terminal Type: Non-removable nut

Ground Electrode Core Material: Nickel

Center Electrode Tip Material: Nickel

Frequently Asked Questions

• What is the Champion QL78YC Marine Spark Plug used for? The Champion QL78YC Marine Spark Plug is an OE-type replacement spark plug designed for marine applications. It features a copper core electrode for increased conductivity and heat control, while its construction helps resist fouling and corrosion. It is also designed to resist overheating under heavy engine loads.
• Is the Champion QL78YC Spark Plug compatible with a 1989 Johnson outboard? No. The Champion QL78YC Spark Plug is specifically listed as not compatible with the 1989 Johnson outboard motor. Customers with this engine should verify the correct replacement spark plug using the applicable parts-finding information before purchasing or installing a replacement.
• What are the specifications of the Champion QL78YC Marine Spark Plug? The Champion QL78YC Marine Spark Plug has a 13/16" hex size, 0.025" - 0.640" preset gap, and 0.500" thread reach. It uses a non-removable nut electrical terminal, with nickel used for both the ground electrode core material and center electrode tip material.
• What features does the Champion QL78YC marine spark plug provide? The Champion QL78YC features a copper core electrode that provides increased conductivity and heat control for good overall wear. Its nickel copper alloy electrode supports heat range control, while the plug is designed to resist fouling and corrosion. The resistor and flat head seat types are also identified as features that contribute to its performance.
• Is the Champion QL78YC Spark Plug designed for marine use? Yes. The Champion QL78YC is identified as a marine spark plug and an OE-type replacement. The description states that it conforms to ISO and SAE standards and is designed to provide dependable performance and durability in marine applications, including resistance to overheating under heavy engine loads.