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Champion Marine Spark Plug (RS12YC)

Part No. 121428

This spark plug has been discontinued by Champion.

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Brand Champion
Model RS12YC
Construction Nickel Alloy Electrodes, Copper Core Centre Electrode.
Suitability Please See The Description For Engine Suitability.
Thread Size 14mm Male
Size Hex: 16mm (5/8")
Reach 18mm (.708")
Range Heat: 12
Resistor Yes
Projection Projected Core Nose
Seat Tapered Seat
Centre Electrode Standard Nickel
Ground Electrode J-Gap Nickel

Champion Part Number: RS12YC

Champion spark plugs are the industry standard fitment now for many well-known engine manufacturers. Whether you have an inboard or outboard petrol engine, chances are Champion can provide the spark plug you need. This is the RS12YC model Champion spark plug.

This conventional spark plug has nickel alloy electrodes and a copper core centre electrode that allows increased conductivity and heat control.

RS12YC Spark Plug suits:

CHRIS-CRAFT: w/5.7 Litre GSi.

CRUSADER Classic Series: 5.7L Plus EFI (350cid), 5.7L Plus MPI (350 cid), 7.4L MPI (454cid).

FLAGSHIP High Performance Engines: 350 cid 320FEFI Gen 1+, 350 cid 355FEFI Gen 1+ K Vortec, 262 cid 250FEFI Gen 1+ E Vortec, 181 cid 145FEFI.

MARINE POWER: 2002-98 4.3L Vortec (225 hp.), 2002-98 5.7L Vortec (325 hp.), 2002-92 181 Tapered Seat (.708" Reach), 1997-96 350 Premium (294 hp.).

MARINETEK GM Engines: 1997-90 181 cid 3.0L HO.

GM V-8 427, 454 & 502 cid: 7.4L MPI (L29) 0L002006 and Above, 7.4LX MPI.
GM V-8 350 & 454 cid Ski Engines: 350 Mag EFI Gen+ 0F800000 & Above, 350 Mag MPI Gen+ 0L002600 & Above, 5.7L Comp Gen+ 0L002005 and Above, Black Scorpion 0F800000 & Above, Scorpion 377.
GM V-8 305, 327 & 350: 350 Mag MPI Gen+ 0L002008 and Above, 5.7L EFI Gen+, 5.7L Gen+ 0L002003 and Above.
GM V-8 427, 454 & 482 cid: 7.4L MPI (L29) 0L010003 and Above.
GM V-8 283, 327, 305 & 350 cid: 350 Mag EFI Gen+ 0F800500 and Above, 350 Mag MPI Gen+ 0F602000 and Above, 377 Scorpion 0L416146 and Above, 5.0L EFI Gen+ 0L012052, 5.0L Gen+ 0L015751, 5.0L MPI, 5.7L EFI Gen+ 0L010035 and Above, 5.7L Gen+ 0L010037 and Above, 5.7LX EFI Gen+.
GM V-6 262 cid: 262 Mag EFI Gen+ 0F803800-0L000000, 4.3 Gen+ 0L010065 and Above, 4.3LH Gen+ 0L010044 and Above, 4.3LL EFI Gen+ 0L012009 and Above, 4.3LX Gen+ 0F803000-0L000000, 4.3LXH Gen+ 0F803000-0L000000.
GM 4-Cyl. 181 cid: 3.0L 0L010042 and Above, 3.0LX.

O.M.C. STERN DRIVE ENGINES: 1996 3.0L SX Cobra, 1996 4.3L SX Cobra (Short Rch .708") Engine. Tag NCS, 1996 5.0L SX Cobra (EFI), 1995-94 5.0L Cobra EFI, 1995-90 3.0L Cobra HO, 1994-93 3.0L Cobra, 1990-87 2.3L Cobra.

PCM: 5.7L HO MPI, 5.8L HO MPI 310 hp., 7.4L MPI.

REDLINE: 351 cid EFI, MAG & HO.

Duoprop Series:
4.3L GIPNCS (.708" Reach), 5.0L Fi, 5.0L GL Gen 1+, 5.0L Gi Gen 1+, 5.7L GS Gen 1+, 5.7L GSi Gen 1+, 7.4L Gi L29.
Inboard Series: 5.7L GSi, GXi, 7.4L Gi L29 (Standard Engines).
Ocean Series GM V-8: 2002 5.0L OSi-XPD, 2002 5.7L OSXi-XDP, 2002 5.7L OSi-XDP, 8.1L Osi-XDP
GM V-6: 2002 4.3L OSi-XDP.
PJX Water Jet: 4.3L GS (.708" Reach), 4.3L Gi (.708" Reach).
SX Cobra Series: 3.0L GS, 4.3L GIPNCS (.708" Reach), 5.0L Fi, 5.0L GL Gen 1+, 5.0L Gi Gen 1+, 5.7L GS Gen 1+, 5.7L GSi Gen 1+, 7.4L Gi L29.

ALMAR: w/Ford 351 cid Mag & HO Engines.

BOSTON WHALER: Rage 18 w/Redline 351 cid HO Engines.

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