Champion 426 Spark Plug
OE Quality 60-Day Returns
Champion
 Copper Plus

Champion 426 Spark Plug

Brand Champion 426
Ground Electrode Core Material Nickel
Electrical Terminal Type Non-removable nut
Center Electrode Tip Material Nickel
Ground Electrode Quantity 1
Insulator Height 0.06
Manufacturer Heat Range 9
Seat Type Flat
Reach 0.75
Thread Diameter 0.551
Thread Diameter 14.000
Resistor Type Yes
Hex Type Hex
Classification Champion copper plus
Hex Size 0.625
Hex Size 15.880
Plug Type Rc9yc5
Product line Copper Plus
Fits Acura, Chevrolet, Chrysler, Dodge, Honda, Jaguar, Mitsubishi, Plymouth, and Toyota · 60 vehicles

Copper core electrode. Improves conductivity and heat control for steady wear.

Nickel electrode materials. Built with nickel center and ground electrodes for reliable performance.

Champion Copper Plus. Dependable spark plug from Champion's Copper Plus line.

Cross-references Karlyn 784, 5369556 and RC9YC5 for the same application. See all 3.

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Champion Copper Plus 426 Spark Plug Overview

Champion Copper Plus 426 is a spark plug built for dependable ignition performance and steady heat control. Its copper core electrode helps improve conductivity, while nickel center and ground electrode materials support consistent wear in everyday driving.

With the RC9YC5 plug type and a flat seat design, this Champion spark plug is a direct-match option for a wide range of Honda, Acura, Chrysler, Dodge, Mitsubishi, Jaguar, Toyota, and Chevrolet applications. It is a practical choice for drivers searching for a Champion 426 spark plug for Honda Civic, Acura Integra, or other OE-style secondary ignition service.

Key Features

  • Copper core electrode for improved conductivity and heat management
  • Nickel center electrode tip and nickel ground electrode core material
  • Resistor design for reduced electrical noise
  • Flat seat construction with 0.75 reach and 14 mm thread diameter
  • Hex size 0.625 in. / 15.880 mm for standard service tools
  • Champion Copper Plus line for OE-style ignition service
  • Part number 426 with plug type RC9YC5

Product Details

The Champion Copper Plus line focuses on reliable everyday ignition performance with a copper core that helps transfer heat efficiently and maintain stable operation. This design supports good overall wear and is suited to vehicles that call for the RC9YC5 plug type. The Champion 426 spark plug is listed across multiple applications, including 2011-2016 Honda CR-Z, 1999-2000 Honda Civic, 1995-1999 Chrysler Sebring, 1995-1999 Dodge Avenger, 1997-1999 Mitsubishi Eclipse, 1995-2001 Acura Integra, and 1990-1992 Chevrolet Corvette.

This part cross-references Karlyn 784 for the same application.

What This Spark Plug Helps Address

  • Hard starting caused by worn or fouled spark plugs
  • Rough idle from inconsistent spark delivery
  • Misfire conditions related to aged secondary ignition components
  • Reduced fuel efficiency from weak ignition performance
  • Maintenance replacement for OE-style tune-up service

Installation Notes and Fitment Tips

Verify the vehicle’s required plug type, thread diameter, reach, seat type, and gap before installation. Fitment examples include Fits 2011-2016 Honda CR-Z, N/A; Fits 1995-2001 Acura Integra, N/A; Fits 1999-2000 Honda Civic, N/A; Fits 1995-1999 Chrysler Sebring, N/A; Fits 1997-1999 Mitsubishi Eclipse, N/A; and Fits 1990-1992 Chevrolet Corvette, N/A. Gap specifications vary by application, including 0.050 in., 0.052 in., 0.044 in., and 0.060 in., so confirm the vehicle-specific requirement before service. The non-removable nut terminal and hex design support standard spark plug service procedures.

Quality Assurance

Champion Copper Plus spark plugs are built to meet the demands of OE-style ignition service with materials selected for conductivity, heat control, and wear consistency. Part number 426 is engineered for direct application matching where RC9YC5 is specified.

Related reading

This part fits 60 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelLitersCylindersNotes
2016HondaCR-Z—1.5LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
2015HondaCR-Z—1.5LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
2014HondaCR-Z—1.5LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
2013HondaCR-Z—1.5LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
2012HondaCR-Z—1.5LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
2011HondaCR-Z—1.5LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
2003JaguarVanden Plas—4.0LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
2003JaguarXJR—4.0LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
2003JaguarXKR—4.2LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
2002JaguarXJR—4.0LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
2001AcuraIntegra—1.8LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
2001JaguarXJR—4.0LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
2000AcuraIntegra—1.8LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
2000HondaCivic—1.6LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
2000JaguarXJR—4.0LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1999AcuraIntegra—1.8LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1999ChryslerSebring—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1999DodgeAvenger—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1999HondaCivic—1.6LL4Gap 0.052 (in); Plug Type Number RC9YC5; Copper Plus
1999JaguarXJR—4.0LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1999MitsubishiEclipse—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1998AcuraIntegra—1.8LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1998ChryslerSebring—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1998DodgeAvenger—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1998EagleTalon—2.0LL4OE Type; Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1998JaguarXJR—4.0LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1998MitsubishiEclipse—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1997AcuraIntegra—1.8LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1997ChryslerSebring—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1997DodgeAvenger—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1997EagleTalon—2.0LL4OE Type; Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1997HondaCivic del Sol—1.6LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1997MitsubishiEclipse—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1996AcuraIntegra—1.8LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1996ChryslerSebring—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1996DodgeAvenger—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1996EagleTalon—2.0LL4OE Type; Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1996HondaCivic del Sol—1.6LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1995AcuraIntegra—1.8LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1995ChryslerSebring—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1995DodgeAvenger—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1995DodgeNeon—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1995EagleTalon—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1995HondaCivic del Sol—1.6LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1995MitsubishiEclipse—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1995PlymouthNeon—2.0LL4Gap 0.050 (in); Actual OE Part; Plug Type Number RC9YC5; Copper Plus
1994AcuraIntegra—1.8LL4OE Type; Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1994HondaCivic del Sol—1.6LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1993AcuraIntegra—1.7LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1993ToyotaCamry—3.0LV6Gap 0.044 (in); Plug Type Number RC9YC5; Copper Plus
1992AcuraIntegra—1.7LL4Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1992ChevroletCorvette—5.7LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1992ToyotaCamry—3.0LV6Gap 0.044 (in); Plug Type Number RC9YC5; Copper Plus
1991ChevroletCorvetteZR-15.7LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1990ChevroletCaprice—5.0LV8Gap 0.060 (in); Plug Type Number RC9YC5; Copper Plus
1990ChevroletCorvetteZR-15.7LV8Gap 0.050 (in); Plug Type Number RC9YC5; Copper Plus
1989ChevroletCaprice—5.0LV8OE Type; Gap 0.060 (in); Plug Type Number RC9YC5; Copper Plus
1988ChevroletCaprice—5.0LV8OE Type; Gap 0.060 (in); Plug Type Number RC9YC5; Copper Plus
1987ChevroletCaprice—5.0LV8OE Type; Gap 0.060 (in); Plug Type Number RC9YC5; Copper Plus
1986ChevroletCaprice—5.0LV8Gap 0.060 (in); Plug Type Number RC9YC5; Copper Plus
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Karlyn — 7845369556RC9YC5