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Part Numbers

Small Engine & Lawn Equipment

  • RC12YC

  • RC14YC

  • RC7YC

  • RJ19LM

  • QJ19LM

  • J19LM

  • J8

  • J8C

  • J8J

  • CJ8

  • J17LM

  • RCJ8

  • RCJ7Y

  • CJ7Y

  • RCJ6Y

Automotive Standard

  • RN12YC

  • RN9YC

  • RN11YC

  • RN14YC

  • RV15YC

  • RV12YC

  • RV9YC

  • QC12YC

  • RC12PYC

  • XC92YC

Wide Gap Variants

  • RC12YC4

  • RC14YC4

  • RV15YC4

  • RN12YC4

  • QC12YC4

Resistor Types (R Series)

  • RC6YC

  • RC7YC

  • RC8YC

  • RC9YC

  • RC10YC

  • RC12YC

  • RC14YC

  • RC15YC

  • RC16YC

  • RC18YC

  • RC20YC

  • RC82YC

  • RC86YC

  • RC87YC

  • RC88YC

  • RC89YC

  • RC90YC

Standard Thread (RN Series)

  • RN6YC

  • RN7YC

  • RN9YC

  • RN11YC

  • RN12YC

  • RN14YC

  • RN15YC

  • RN16YC

  • RN18YC

  • RN20YC

Taper Seat (RV Series)

  • RV12YC

  • RV15YC

  • RV17YC

  • RV19YC

Inductive Suppression (Q Series)

  • QC12YC

  • QC14YC

  • QJ6C

  • QJ8C

  • QJ19LM

​​

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Combined Suppression (X Series)

  • XC12YC

  • XC92YC

High Resistance (T Series)

  • TJ6Y

  • TC6Y

Long Reach (L Series)

  • RL82YC

  • RL87YC

  • L82YC

  • L86YC

  • L87YC

  • L88YC

  • L7YC

Marine Applications

  • RV15YC

  • RN12YC

  • QC12YC

  • RCJ8

  • RCJ6Y

Small Thread (10mm)

  • RCJ6Y

  • RCJ7Y

  • RCJ8

  • CJ6Y

  • CJ7Y

  • CJ8

Platinum Series

  • RC12PYC

  • RN12PYC

  • RE14PYP

Industrial/Commercial

  • L78YC

  • L82YC

  • L86YC

  • L87YC

  • L88YC

  • L92YC

  • N4C

  • N6YC

  • N7YC

  • N8YC

  • N9YC

Racing/Performance

  • C57YX

  • C59YX

  • N57YX

  • C12YC

  • N12YC

Historical Aviation (20-49 Range)

  • H21

  • H23

  • H25

  • H27

  • H29

Large Thread (18mm F Series)

  • F7YC

  • F9YC

  • F12YC

  • F14YC

Specialty Applications

  • U4AC (Auxiliary gap)

  • UJ19LM (Auxiliary gap lawn mower)

  • 3071T04

  • 3071

Part Number Structure Guide

Format: [Resistor][Thread][Heat Range][Firing End][Gap]

Resistor Codes:

  • R = 3k-10k ohm resistor

  • K = 1k-2k ohm resistor

  • T = 7k-15k ohm resistor

  • Q = Low resistance inductive

  • X = Combined resistive/inductive

  • U = Internal auxiliary air gap

  • (blank) = Non-resistor

Thread Codes:

  • A = 12mm x 1.25mm gasket

  • C = 14mm x 1.25mm gasket

  • CJ = 14mm x 1.25mm short gasket

  • DJ = 14mm x 1.25mm taper

  • E = 14mm x 1.25mm long taper

  • F = 18mm x 1.5mm taper

  • G = 10mm x 1.0mm gasket

  • J = 14mm x 1.25mm gasket

  • L = 14mm x 1.25mm medium gasket

  • N = 14mm x 1.25mm gasket

  • P = 12mm x 1.25mm gasket

  • S = 14mm x 1.25mm taper

  • V = 14mm x 1.25mm taper

  • Y = 10mm x 1.0mm gasket

  • Z = 10mm x 1.0mm gasket

Heat Ranges:

  • 1-20: Automotive/Small Engine

  • 20-49: Historical Aviation

  • 50-65: Racing

  • 65-100: Industrial

Firing End Codes:

  • YC = Standard copper

  • YCX = Extended copper

  • PYC = Platinum tip

  • WYC = Iridium tip

  • GYC = Gold palladium

  • LM = Lawn mower special

Gap Designations:

  • 2 = .020"

  • 3 = .030"

  • 4 = .040"

  • 5 = .050"

Note: This list represents commonly available Champion spark plug part numbers. Availability may vary by region and application

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