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Champion 123 Spark PlugOE Quality 60-Day Returns
Part #: 123

Champion 123 Spark Plug

Copper Plus
52 vehicles fit this part
Select your vehicle to confirm fitment
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Copper Plus
Fitment: Polaris, Gas Gas, Beta, Husqvarna, Ski-Doo, Arctic Cat, Honda, Lamborghini, Kawasaki, Maico, Volkswagen, Triumph, Yamaha, Nissan, Porsche, Renault, Suzuki, Harley Davidson, Morris, BMW, Chevrolet, GMC, MG, Morgan, Austin, Hillman, Jaguar, Lancia, Land Rover, NSU, Elva, Fargo, Bentley, Rolls-Royce, Singer, Wolseley, Humber, Alvis, International, Riley, Rover, Standard, TVR, Vauxhall, Fairthorpe, Metropolitan, Berkeley, Dodge, Lotus, Armstrong-Siddeley, Jensen, Alfa Romeo, Austin Healey, Sunbeam, Allard, Arnolt-MG, Healey, Lanchester, and Bugatti, 120 INDY, EC 250 R, EC 300 R, 250 RR (2 Stroke), EC 200E, EC 250, EC 250E, EC 300E, 250 RR-Race Edition (2-Stroke), EVO 125, EVO 125 Factory, EVO 200, EVO 200 Sport, EC 250 Replica, EC 300 Replica, XC 250, XC 300, WR300, 120 Pro-R, XC 250 Cervantes Replica, 120 Dragon, Expedition 600, MC 250, SM Halley 125, MX Z 600 Renegade, GTX 600 Sport, MC 125, SM 125, Wild HP 300 RV, 120 Pro X, SM 250, Wild HP 300, 120 XC SP, Scrambler 400 2x4, Xplorer 400L, 120 XCR, Scrambler 400 4x4, Jag 340, Jag 340 Deluxe, NS50F, Skandic 377R, Skandic 377, TR32 125, Countach, KZ750K LTD Belt, Blizzard 5500 MX, Citation 3500, Nordik, SS25, KZ750F LTD Shaft, 400, Citation 4500, Citation SS, Vanagon, Prelude, KZ750M CSR, Accord, CR450R, Blizzard 5500, Bonneville 750 T140D, Bonneville 750 T140E Final Edition, KZ750G LTD II, Civic, KZ750B/E, 400 Enduro, 450 Enduro, Bonneville 750 T140E America, XL175, MX175, CJ360, MR175, CB360, CB360T, CB500T Twin DOHC, CL360 Scrambler, MR250, MT125, MT250, CR360, 280Z, Colt 175, 914, R15, TS250, Trident 750 T160V, Cheetah 340, TC 175, TY175, Panther 340, SS350, CB360G, CL450K Scrambler, Minor, R12, R17, GT750 Le Mans, 412, SC500, SM292, CB350G Super Sport, CL350 Scrambler, 510, 610, 411, Campmobile, Transporter, MX250, CB350K Super Sport, SL350, R16, Oxford, DT1E, DT1MX, RT1MX, 1600, DT1C-MX, R60/2, Blazer, C10 Pickup, C10 Suburban, C20 Pickup, C20 Suburban, C30 Pickup, K10 Pickup, K10 Suburban, K20 Pickup, K20 Suburban, and K30 Pickup
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Reliable Spark Plug for Secondary Ignition Systems

The Champion Copper Plus 123 spark plug is engineered to deliver consistent ignition performance for a range of vehicles including Chevrolet Blazer, Honda Accord, and Volkswagen Vanagon. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

  • Ground electrode core made of nickel for durability
  • Nickel center electrode tip for stable ignition
  • Pre-gap size of 0.025 inches (0.64 mm) for optimal spark
  • Flat seat type ensuring proper sealing
  • Resistor type spark plug to reduce electrical interference
  • Thread diameter of 14 mm (0.551 inches) with 0.75-inch reach
  • Hex size of 20.65 mm (0.813 inches) for easy installation
  • Manufacturer heat range rating of 5 for balanced heat dissipation

About the Champion Copper Plus Product Line

The Copper Plus line from Champion focuses on spark plugs that combine copper core technology with durable electrode materials to provide reliable ignition in small engine applications. The Copper Plus 123 spark plug features a nickel copper alloy ground electrode and nickel center electrode tip, designed to maintain consistent performance and longevity in secondary ignition systems across various vehicle makes and models.

Technical Details and Compatibility

This spark plug, part number 123, is classified as Champion copper plus small engine type Rn5c. It features a single ground electrode made from a nickel copper alloy and a removable nut electrical terminal type. The plug’s taper diameter is 0.25 inches, and it has an installed height of 2.24 inches. Compatible with vehicles such as the Chevrolet C10 Suburban, Honda Civic, Nissan K10 Suburban, and Lamborghini Countach, this spark plug meets the specific ignition requirements for these models.

Common Applications and Problem Solving

  • Improves ignition reliability in Chevrolet Blazer and C20 Suburban engines
  • Reduces misfires and rough idling in Honda Accord and Prelude models
  • Supports consistent spark delivery in Volkswagen Vanagon and Nissan K20 Suburban
  • Helps maintain engine performance in luxury vehicles like Bentley Continental
  • Addresses ignition issues related to worn or corroded spark plugs

Installation Notes and Tips

Ensure the spark plug gap is set to the specified pre-gap size of 0.025 inches (0.64 mm) before installation. Use a 20.65 mm (0.813 inch) hex socket for proper torque application. The flat seat design requires careful seating to avoid leaks. The removable nut electrical terminal allows for flexible connection options. Follow manufacturer torque specifications to prevent damage to the thread or electrode.

Quality Assurance and Warranty

Champion Copper Plus spark plugs are manufactured to meet OEM standards for heat range and durability. The part number 123 is designed with a resistor to minimize electrical interference, ensuring compatibility with modern ignition systems. While specific warranty details are not provided, Champion products typically adhere to industry quality controls and reliability standards.

BrandChampion
Part Number123
PositionCopper Plus
Center Electrode Diameter (Inch)0.1
Center Electrode Tip MaterialNickel
ClassificationChampion Copper Plus Small Engine
Electrical Terminal TypeRemovable Nut
Ground Electrode Core MaterialNickel
Ground Electrode MaterialNickel Copper Alloy
Ground Electrode Quantity1
Hex Size0.813
Hex Size20.650
Hex TypeHex
Installed Height (Inch)2.24
Manufacturer Heat Range5
Plug TypeRN5C
Pre-Gap Size0.025
Pre-Gap Size0.64
Reach0.75
Resistor TypeYes
Seat TypeFlat
Taper Diameter (Inch)0.25
Thread Diameter0.551
Thread Diameter14.000

This part fits 52 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
1985LamborghiniCountach4.8LV12N/AGap 0.024 (in); Plug Type Number RN5C; Copper Plus
1984LamborghiniCountach4.8LV12N/AGap 0.024 (in); Plug Type Number RN5C; Copper Plus
1983LamborghiniCountach4.8LV12N/AGap 0.024 (in); Plug Type Number RN5C; Copper Plus
1983VolkswagenVanagon2.0LH4N/AResistor Type; Gap 0.028 (in); Plug Type Number RN5C; Copper Plus
1983VolkswagenVanagon1.9LH4N/AResistor Type; Gap 0.028 (in); Plug Type Number RN5C; Copper Plus
1982HondaPrelude1.8LL4N/AGap 0.044 (in); Plug Type Number RN5C; Copper Plus
1982LamborghiniCountach4.8LV12N/AGap 0.024 (in); Plug Type Number RN5C; Copper Plus
1982VolkswagenVanagon2.0LH4N/AResistor Type; Gap 0.028 (in); Plug Type Number RN5C; Copper Plus
1981HondaAccord1.8LL4N/AGap 0.044 (in); Plug Type Number RN5C; Copper Plus
1981HondaPrelude1.8LL4N/AGap 0.044 (in); Plug Type Number RN5C; Copper Plus
1981VolkswagenVanagon2.0LH4N/AResistor Type; Gap 0.028 (in); Plug Type Number RN5C; Copper Plus
1980VolkswagenVanagon2.0LH4N/AResistor Type; Gap 0.028 (in); Plug Type Number RN5C; Copper Plus
1979HondaCivic1.5LL4N/AOE Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1978HondaAccord1.6LL4N/AGap 0.032 (in); Plug Type Number RN5C; Copper Plus
1978HondaCivic1.5LL4N/AOE Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1977HondaAccord1.6LL4N/AGap 0.032 (in); Plug Type Number RN5C; Copper Plus
1977HondaCivic1.5LL4N/AOE Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1976HondaAccord1.6LL4N/AGap 0.032 (in); Plug Type Number RN5C; Copper Plus
1976HondaCivic1.5LL4N/AOE Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1975HondaCivic1.5LL4N/AGap 0.032 (in); Plug Type Number RN5C; Copper Plus
1975HondaCivic1.5LL4N/AOE Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1973Nissan5101.6LL4N/AResistor Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1972Nissan5101.6LL4N/AResistor Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1971Nissan5101.6LL4N/AResistor Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1970Nissan5101.6LL4N/AResistor Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1969ChevroletBlazer4.8LL6N/AGap 0.035 (in); Plug Type Number RN5C; Copper Plus
1969ChevroletC10 Suburban4.8LL6N/AGap 0.035 (in); Plug Type Number RN5C; Copper Plus
1969ChevroletC20 Suburban4.8LL6N/AGap 0.035 (in); Plug Type Number RN5C; Copper Plus
1969ChevroletK10 Suburban4.8LL6N/AGap 0.035 (in); Plug Type Number RN5C; Copper Plus
1969ChevroletK20 Suburban4.8LL6N/AGap 0.035 (in); Plug Type Number RN5C; Copper Plus
1969Nissan5101.6LL4N/AResistor Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1968ChevroletC10 Suburban4.8LL6N/AResistor Type; Gap 0.035 (in); Plug Type Number RN5C; Copper Plus
1968ChevroletC20 Suburban4.8LL6N/AResistor Type; Gap 0.035 (in); Plug Type Number RN5C; Copper Plus
1968ChevroletK20 Suburban4.8LL6N/AResistor Type; Gap 0.035 (in); Plug Type Number RN5C; Copper Plus
1968Nissan5101.6LL4N/AResistor Type; Gap 0.032 (in); Plug Type Number RN5C; Copper Plus
1967ChevroletC10 Suburban4.8LL6N/AResistor Type; Gap 0.035 (in); Plug Type Number RN5C; Copper Plus
1967ChevroletC20 Suburban4.8LL6N/AResistor Type; Gap 0.035 (in); Plug Type Number RN5C; Copper Plus
1967ChevroletK10 Suburban4.8LL6N/AResistor Type; Gap 0.035 (in); Plug Type Number RN5C; Copper Plus
1967ChevroletK20 Suburban4.8LL6N/AResistor Type; Gap 0.035 (in); Plug Type Number RN5C; Copper Plus
1965BentleyContinental6.2LV8N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1964BentleyContinental6.2LV8N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1963BentleyContinental6.2LV8N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1962BentleyContinental6.2LV8N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1961BentleyContinental6.2LV8N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1960BentleyContinental6.2LV8N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1959BentleyContinental6.2LV8N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1954BentleyContinental4.9LL6N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1954BentleyContinental4.6LL6N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1953BentleyContinental4.9LL6N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1953BentleyContinental4.6LL6N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1952BentleyContinental4.9LL6N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus
1952BentleyContinental4.6LL6N/AResistor Type; Gap 0.025 (in); Plug Type Number RN5C; Copper Plus

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

1097126816774114314GR414GR73110405406418324722672373137510AGR31AGR3XAGR41AGR51AGS3CAGS4CBR4ESBR5EBBR5EB11BR5ESBR5ES11BR6EBBR6EB11CR43NCR44NF5RCF7CGA11342R43CXLR43XLR44CXLR44NR44XLR45XLRN5RN5CRN6RN8S43XLRW145TR2W16ESRUWR7CE+WR8CCWR9CWR9CCXN5XN6XN8XN8BXNA8

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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