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BOAT SUPPLY MIAMI

Mercury Outboard Spark Plug Guide

Search by Mercury model or description, horsepower, year, or NGK spark plug. FourStroke and Verado applications are prioritized for the U.S. market. Always confirm the engine serial number before ordering.

292 applications

Model / Application Mercury Model / Description HP Years NGK Spark Plug Gap mm Shop
10 HP10 hp101991 onwardBP8HS-151.5Shop this plug
10 HP10 Sea Pro101991-2000BP8HS-151.5Shop this plug
10 HPXR10101992-1998BP8HS-151.5Shop this plug
100 HP1001001988-1999BP8H-N-101.0Shop this plug
100 HP10001001962-1964B7S0.7Shop this plug
100 HP1000BP1001968-1969BUHW—Shop this plug
100 HP1000SS1001968-1969BUHW—Shop this plug
105 HP105 Jet1051995-1998BU8H1.5Shop this plug
10X High Performance Engine10X High Performance Engine——BP8HS-101.0Shop this plug
110 HP11001101966 onwardB7HS0.7Shop this plug
110 HP1100SS1101966-1967BUHW—Shop this plug
115 HP11501151970-1978BUHW—Shop this plug
115 HP3 Cyl. 2 Stroke Optimax Pro XS 1.5L1152006-2011IZFR5J0.8Shop this plug
115 HP4 cyl. 2 Stroke1151989-2000BP8H-N-101.0Shop this plug
115 HP6 cyl.1151979-1988BUHW—Shop this plug
115 HPEFI MFI - 4 cyl. 4 Stroke1152001-2006LFR6A-111.1Shop this plug
115 HPOptimax1152006 onwardIZFR5J0.8Shop this plug
115 HPOptimax 6 cyl. 2 Stroke1152000-2002PZFR5F-111.1Shop this plug
115 HPWalleye Engine L4NA1152007 onwardLFR4A-E0.8Shop this plug
125 HP1250BP, 1250SS1251968-1969BUHW1.3Shop this plug
125 HP3 cyl. Optimax1252010-2011IZFR5J0.8Shop this plug
125 HP4 cyl. 2 Stroke1252001-2006BPZ8H-N-101.0Shop this plug
135 HP135 hp1351986-1999BU8H1.5Shop this plug
135 HP13501351970-1971BUHW1.3Shop this plug
135 HP6 cyl. 2 Stroke1352000-2002BPZ8HS-101.0Shop this plug
135 HP6 cyl. 2 Stroke Optimax DFI1352003-2006IZFR5G0.8Shop this plug
135 HP6 cyl. 4 Stroke EFI Supercharged1352006 onwardILFR6G-E0.8Shop this plug
140 HP1401401979-1980BUHW—Shop this plug
140 HP140 Jet1401995-1999BU8H1.5Shop this plug
140 HP14001401972-1978BUHW—Shop this plug
15 HP150151960-1961B6S—Shop this plug
15 HP2 Stroke152001-2006BPZ8HS-15—Shop this plug
15 HP4 Stroke Bigfoot 323cc151998-2006DPR6EA-90.9Shop this plug
15 HP4 Stroke Bigfoot, Prockicker 351cc152007-2011DCPR6E0.9Shop this plug
15 HPSea Pro151995-1996BP8HS-101.0Shop this plug
15 HPSea Pro 2 Stroke152001-2002BPZ8HS-15—Shop this plug
150 HP150 hp1501991-1999BU8H1.5Shop this plug
150 HP1501501979-1984BU8H1.5Shop this plug
150 HP150 EFI1501998-1999BU8H1.5Shop this plug
150 HP150 EFI - 6 cyl. 2 Stroke1502000-2006BPZ8HS-101.0Shop this plug
150 HP150 EFI - 6 cyl. 4 StrokeSupercharged1502006 onwardILFR6G-E0.8Shop this plug
150 HP150 EFI - 6-cyl. 4 Stroke, Supercharged1502006 onwardILFR6G-E0.8Shop this plug
150 HP150 Marathon1501985-1988BU8H1.5Shop this plug
150 HP150 Optimax DFI 6 cyl. 2 Stroke1502003-2006IZFR5G0.8Shop this plug
150 HP150 Optimax Pro XS 2.5L1502003-2011IZFR5G0.8Shop this plug
150 HP150 Verado 4 Stroke 1.7L1502006-2011LFR5AIX-11—Shop this plug
150 HP150 XR-2, XR-41501985-2002BU8H—Shop this plug
150 HP150 XR-61501992-1997BU8H—Shop this plug
150 HP150 XRi1501993-2002BU8H1.5Shop this plug
150 HP15001501978 onwardBU8H1.5Shop this plug
150 Magnum Pro Max Super150 Magnum Pro Max Super——BUHW—Shop this plug
175 HP175 hp1751979-1998BU8H1.5Shop this plug
175 HP175 EFI1751998-1999BU8H1.5Shop this plug
175 HP175 EFI 6 cyl. 4 Stroke Supercharged1752006 onwardILFR6G—Shop this plug
175 HP175 EFI 6 cyl. 4 Stroke, Supercharged1752006 onwardILFR6G—Shop this plug
175 HP175 EFI MFI 6 cyl. 2 Stroke1752000-2001BPZ8HS-101.0Shop this plug
175 HP175 EFI Verado 4 cyl. 4 Stroke 1.7L1752005-2011ILFR6G-E0.8Shop this plug
175 HP175 Optimax DFI 6 cyl. 2 Stroke1752003-2006IZFR5G0.8Shop this plug
175 HP175 Optimax Pro XS 6 cyl. 2 Stroke1752003-2011IZFR5G0.8Shop this plug
175 HP175 XRi1751991-2002BU8H—Shop this plug
18 HP18 hp181981-1983BP8H-N-101.0Shop this plug
18 HP18 XD181984-1985BP8H-N-101.0Shop this plug
2.0L F1 Carb/EFI High Performance Engine2.0L F1 Carb/EFI High Performance Engine——BUHW—Shop this plug
2.2 HP2 Stroke2.21984-1994BPR6HS-101.0Shop this plug
2.4L Bass High Performance Engine2.4L Bass High Performance Engine——BUHW1.3Shop this plug
2.4L EFI High Performance Engine2.4L EFI High Performance Engine——BUHW—Shop this plug
2.4L Mod VP High Performance Engine2.4L Mod VP High Performance Engine——BUHW1.3Shop this plug
2.5 HP2.5 hp2.52006 onwardBPR6HS-101.0Shop this plug
2.5 HP4 Stroke 85cc2.52006-2011DCPR6E0.9Shop this plug
2.5 HPClassic2.51993-2005BP6HS-101.0Shop this plug
2.5L CarbHigh Performance Engine2.5L CarbHigh Performance Engine—1991-1993BUHW—Shop this plug
2.5L EFI High Performance Engine2.5L EFI High Performance Engine—1994-1997BUZHW—Shop this plug
20 HP20 hp201979-1980BUHW-2—Shop this plug
20 HP2 Stroke201986-2000BP8H-N-101.0Shop this plug
20 HP200201970-1978BUHW-2—Shop this plug
20 HP351cc202008-2011DCPR6E0.9Shop this plug
20 HP4 Stroke (Carb.)20—DCPR6E0.9Shop this plug
20 HPJet 2 Stroke201995-2000BP8H-N-101.0Shop this plug
20 HPSea Pro 2 Stroke202001 onwardBPZ8H-N-101.0Shop this plug
200 HP2.0L Duece High EFI2001997 onwardBUZ8H1.5Shop this plug
200 HP2.0L F1 EFI2001997 onwardBUZHW—Shop this plug
200 HP2.0L SST 120 EFI2001997 onwardBUHW—Shop this plug
200 HP2.0L XR2 SS EFI2001997 onwardBUHW—Shop this plug
200 HP2002001979-1999BU8H—Shop this plug
200 HP200 DFI2001997 onwardPZFR6H0.8Shop this plug
200 HP200 EFI2001998-1999BU8H1.5Shop this plug
200 HP200 EFI 4 Stroke2002006 onwardILFR6G0.8Shop this plug
200 HP200 EFI 6 cyl. 2 Stroke2002006 onwardBR8HS0.7Shop this plug
200 HP200 EFI MFI 6 cyl. 2 Stroke2002006 onwardBR8HS0.7Shop this plug
200 HP200 Optimax 6 cyl. 2 Stroke2001996-2002PZFR5F-111.1Shop this plug
200 HP200 Optimax XS 2.5L2002000-2004PZFR5F-111.1Shop this plug
200 HP200 Optimax XS 3.0L2002000-2004PZFR5F-111.1Shop this plug
200 HP200 Optimax XS 6 cyl.2002002-2004PZFR5F-111.1Shop this plug
200 HP200 Verado 4 cyl. 4 Stroke200—ILFR6G-E0.8Shop this plug
200 HP200 Verado 6 cyl. 4 Stroke2002004 onwardILFR6G—Shop this plug
200 HP200 XRi2001989-2002BUZ8H1.5Shop this plug
200 HP20002001978 onwardBUHW—Shop this plug
200 HP6 cyl. 2 Stroke2002000-2006BPZ8HS-101.0Shop this plug
200 Magnum EFI Pro Max Super200 Magnum EFI Pro Max Super——BUHW—Shop this plug
21.9 cu in 25SS Racing21.9 cu in 25SS Racing——BUHW—Shop this plug
220 HPV-220 Laser2201987-1988BUZ8H—Shop this plug
225 HP225 hp2251994-1997BPZ8H-N-101.0Shop this plug
225 HP2252251980-1981BU8H1.5Shop this plug
225 HP225 EFI - 6-cyl. 4 Stroke, Supercharged2252006 onwardILFR6G—Shop this plug
225 HP225 EFI 6 cyl. 4 Stroke Supercharged2252006 onwardILFR6G—Shop this plug
225 HP225 EFI DFI 6 cyl. 2 Stroke2251995-2006BR8HS0.7Shop this plug
225 HP225 EFI DFI 6 cyl. 4 Stroke2252006 onwardLFR5A-111.1Shop this plug
225 HP225 Optimax 6 cyl. 2 Stroke2251996-2004PZFR5F-111.1Shop this plug
225 HP225 Optimax Pro XS 3.0L V62252005-2011IZFR5G0.8Shop this plug
225 HP225 Optimax XS 6 cyl. 2 Stroke2252003-2004IZFR6J0.8Shop this plug
225 HP225 Verado - 6 cyl. 4 Stroke2252004 onwardILFR6G—Shop this plug
225 HP225 Verado - 6-cyl. 4 Stroke2252004 onwardILFR6G—Shop this plug
225 HP225 XRi EFI2251995-2002BR8HS0.7Shop this plug
225 HP3.0L DFI2251997 onwardPZFR5F-111.1Shop this plug
225 HP3.0L Sea Pro 6 cyl. 2 Stroke2251997-2002BR8HS0.7Shop this plug
225 HP3.0L Work2251994-1997BPZ8H-N-101.0Shop this plug
225 HP6 cyl. 2 Stroke2251998-2001BR8HS0.7Shop this plug
225 Magnum EFI Pro Max Super225 Magnum EFI Pro Max Super——BUHW—Shop this plug
245 HP2.5L2451995-1996BU8H—Shop this plug
25 HP25 hp251980-1983BP8H-N-101.0Shop this plug
25 HP2 Stroke251993-2000BP8H-N-101.0Shop this plug
25 HP25 EFI 526cc252006-2011DCPR6E0.9Shop this plug
25 HP25 XD251984-1985BP8H-N-101.0Shop this plug
25 HP250251962 onwardB6S0.7Shop this plug
25 HP4 Stroke251998-2001DPR6EA-90.9Shop this plug
25 HP4 Stroke EFI252006 onwardDCPR6E0.9Shop this plug
25 HPSea Pro 2 Stroke251993-2002BP8H-N-10—Shop this plug
250 HP250 3.4L2501989-1990BU8H1.5Shop this plug
250 HP250 EFI - 6 cyl. 4 Stroke, Supercharged2502006 onwardILFR6G-E0.8Shop this plug
250 HP250 EFI 6 cyl. 4 Stroke Supercharged2502006 onwardILFR6G-E0.8Shop this plug
250 HP250 Verado - 6 cyl. 4 Stroke2502004 onwardILFR6G—Shop this plug
250 HP250 Verado 6 cyl. 4 Stroke2502004 onwardILFR6G—Shop this plug
250 HP250 XRi EFI 6 cyl. 2 Stroke2501995-2006BR8HS0.7Shop this plug
250 HP250 XS Optimax 6 cyl. 2 Stroke2502003-2006IZFR6J0.8Shop this plug
25SS High Performance Engine25SS High Performance Engine——BUHW-2—Shop this plug
25XS High Performance Engine25XS High Performance Engine——BUHW—Shop this plug
260 HP2.5L Offshore2601995-1997BU8H1.5Shop this plug
265 HP2.5L SS Drag EFI2651997 onwardBU8H1.5Shop this plug
275 HP2752751989-1994BU8H1.5Shop this plug
275 HP275 EFI - 6 cyl. 4 Stroke, Supercharged2752006 onwardILFR6G-E0.8Shop this plug
275 HP275 EFI 6 cyl. 4 Stroke Supercharged2752006 onwardILFR6G-E0.8Shop this plug
275 HP275 Verado - 6 cyl. 4 Stroke2752004 onwardILFR6G-E0.8Shop this plug
275 HP275 Verado 6 cyl. 4 Stroke2752004 onwardILFR6G-E0.8Shop this plug
280 HP2.5L EFI Sport, EFI SS2802002 onwardBZ7HS-101.0Shop this plug
280 HP2.5L Offshore2802002 onwardBZ7HS-101.0Shop this plug
3.0 HP3.0 hp3.01990-1992BPR6HS-101.0Shop this plug
3.3 HP3.3 hp3.31993-2006BPR6HS-101.0Shop this plug
3.5 HP3.5 hp3.51983-1985BP6HS-101.0Shop this plug
3.5 HP4 Stroke 85cc3.52006-2011DCPR6E0.9Shop this plug
3.6 HP3.6 hp3.61980-1982BP7HS-101.0Shop this plug
3.9 HP3.9 hp3.91967-1968B5HS0.6Shop this plug
30 HP2 cyl. 2 Stroke302001 onwardBPZ8H-N-101.0Shop this plug
30 HP2 cyl. 4 Stroke301999-2002DPR6EA-90.9Shop this plug
30 HP3 cyl. 2 Stroke302001 onwardBPZ8H-N-101.0Shop this plug
30 HP3 cyl. 4 Stroke EFI302006 onwardDCPR7E0.9Shop this plug
30 HP30 EFI 526cc301999-2011DPR6EA-90.9Shop this plug
30 HP300 4 cyl.301960 onwardB6S0.7Shop this plug
30 HP3cyl.301995-1997BUHW-2—Shop this plug
30 HPJet 2 cyl. 2 Stroke302001-2002BPZ8H-N-101.0Shop this plug
30 HPJet 3 cyl. 2 Stroke301998-2001BP8H-N-101.0Shop this plug
30 HPSea Pro 2 cyl. 2 Stroke301995-2000BP8H-N-101.0Shop this plug
30 HPSea Pro 2 cyl. 2 Stroke302001-2002BPZ8H-N-101.0Shop this plug
300 HP2.5L S3000 EFI3001997 onwardBU8H1.5Shop this plug
300 HP3.4L3001984-1988BU8H1.5Shop this plug
300 HP3003001981-1983BU8H1.5Shop this plug
300 HP300 Optimax XS EFI 3.2L3002006-2011IZFR5J0.8Shop this plug
300 HP300 Verado300—ILFR6G-E0.8Shop this plug
300 HP300 Verado Pro Four Stroke - 2.6L3002008-2011LFR5AIX-11—Shop this plug
35 HP35 hp351984-1991BUHW—Shop this plug
35 HP350351963-1965B6S—Shop this plug
35 HP350 4 cyl.351961 onwardB6S0.7Shop this plug
350 HP350 Verado SCI350—ILFR6G-E0.8Shop this plug
4.0 HP4.0 hp4.01970-1974BUHW-2—Shop this plug
4.0 HP2 Stroke Classic4.01988-2006BPR7HS-101.0Shop this plug
4.0 HP4 Stroke4.02000-2006DCPR6E0.9Shop this plug
4.0 HP4 Stroke 123cc4.02000-2011DCPR6E0.9Shop this plug
4.0 HP40 Gnat4.01976-1979BR6HS0.7Shop this plug
4.5 HP4.5 hp4.51975-1985BUHW-2—Shop this plug
40 HP2 cyl.401979-1983BUHW—Shop this plug
40 HP2 cyl. 2 Stroke402001 onwardBPZ8H-N-101.0Shop this plug
40 HP2 cyl. 2 Stroke Sea Pro402001-2006BPZ8H-N-101.0Shop this plug
40 HP3 cyl. 2 Stroke402001-2002BPZ8H-N-101.0Shop this plug
40 HP3 cyl. 4 Stroke401998-2002DPR6EA-90.9Shop this plug
40 HP3 cyl. 4 Stroke EFI402006 onwardDCPR7E0.9Shop this plug
40 HP4 cyl.401988-1997BUHW-2—Shop this plug
40 HP4 cyl. 4 Stroke Big Foot402001-2006DPR6EA-90.9Shop this plug
40 HP4 cyl. 4 Stroke EFI402006 onwardDCPR7E0.9Shop this plug
40 HP4 cyl. 4 Stroke EFI, Bigfoot 995cc402007-2011DCPR6E0.9Shop this plug
40 HP400401970-1971BUHW—Shop this plug
40 HP402401972-1978BUHW—Shop this plug
44XS High Performance Engine44XS High Performance Engine——BUHW-2—Shop this plug
45 HP45 hp451986-1989BUHW-2—Shop this plug
45 HP450451962 onwardB6S0.7Shop this plug
45 HPBodensee 4 cyl. 4 Stroke451995-2002DPR6EA-90.9Shop this plug
45 HPJet 3 cyl. 2 Stroke451995-2000BP8H-N-101.0Shop this plug
49.9 cu in 650X Racing49.9 cu in 650X Racing——BUHW—Shop this plug
5.0 HP2 Stroke Classic5.01988-2006BPR7HS-101.0Shop this plug
5.0 HP4 Stroke 123cc5.02000-2006DCPR6E0.9Shop this plug
50 HP3 cyl.501986-1990BUHW—Shop this plug
50 HP3 cyl. 2 Stroke501991-2000BP8H-N-101.0Shop this plug
50 HP4 cyl.501979-1985BUHW-21.8Shop this plug
50 HP4 cyl. 4 Stroke Bigfoot501995-2001DPR6EA-90.9Shop this plug
50 HP4 cyl. 4 Stroke EFI502006 onwardDCPR7E0.9Shop this plug
50 HP4 cyl. 4 Stroke EFI, Bigfoot 995cc502006-2011DCPR6E0.9Shop this plug
50 HP500501965-1966B7S0.7Shop this plug
50 HP500M501967 onwardB7HS0.7Shop this plug
50 HP500S501967 onwardB7HS0.7Shop this plug
50 HP500SS501967 onwardBUHW—Shop this plug
55 HPSea Pro 3 cyl. 2 Stroke552001-2006BPZ8H-N-101.0Shop this plug
6.0 HP6.0 hp6.01963-1966B6S0.7Shop this plug
6.0 HP2 Stroke6.01986-2000BP8H-N-101.0Shop this plug
6.0 HP4 Stroke 123cc6.02000-2011DCPR6E0.9Shop this plug
60 HP3 cyl. 2 Stroke601991-2002BP8H-N-101.0Shop this plug
60 HP3 cyl. 2 Stroke Sea Pro601995-2000BP8H-N-101.0Shop this plug
60 HP4 cyl. 4 Stroke602001 onwardDPR6EA-90.9Shop this plug
60 HP4 cyl. 4 Stroke EFI602006 onwardDCPR7E0.9Shop this plug
60 HP4 cyl. 4 Stroke EFI, Big Foot 995cc602001-2011DCPR6E0.9Shop this plug
60 HP6 cyl. 600601960 onwardB6S0.7Shop this plug
60 HP60601984-1990BUHW—Shop this plug
60 HPBig Foot601995-2002BP8H-N-101.0Shop this plug
60 HPJet60—BUZHW-21.8Shop this plug
65 HP650651972-1976BUHW1.3Shop this plug
65 HP650S651968-1971BUHW—Shop this plug
65 HP650SS651967-1971BUH1.3Shop this plug
65 HPJet 3 cyl. 2 Stroke651995-2000BUHW-2—Shop this plug
7.5 HP7.5 hp7.51979-1985B9HS-101.0Shop this plug
70 HP70 hp701987-1989BUHW-2—Shop this plug
70 HP700701960-1961B6S0.7Shop this plug
70 HP700701977-1978BUHW—Shop this plug
75 HP3 cyl. 2 Stroke751987-2000BUHW-2—Shop this plug
75 HP3 cyl. 2 Stroke Jet752001 onwardBUZHW-2—Shop this plug
75 HP3 cyl. 2 Stroke Sea Pro751991-2001BUHW-2—Shop this plug
75 HP3 cyl. Optimax 1.5L752003-2011IZFR5J0.8Shop this plug
75 HP4 cyl. 4 Stroke DOHC752000-2006LFR5A-111.1Shop this plug
75 HP4 cyl. 4 Stroke EFI 1.7L75—LFR5AIX-11—Shop this plug
75 HP4 cyl. 75XD751984-1986BUHW-2—Shop this plug
75 HPWalleye Engine L4NA752007 onwardLFR4A-E0.8Shop this plug
8.0 HP2 Stroke8.02001-2006BPZ8H-N-101.0Shop this plug
8.0 HP2 Stroke Bodensee8.01995-2002CR6HS0.7Shop this plug
8.0 HP208cc8.02005-2011DCPR6E0.9Shop this plug
8.0 HP4 Stroke8.02006 onwardDCPR6E0.9Shop this plug
80 HP3 cyl.801987-1989BUHW-2—Shop this plug
80 HP4 cyl.801979-1983BUHW-2—Shop this plug
80 HP4 cyl. 2 Stroke Jet802001 onwardBPZ8H-N-101.0Shop this plug
80 HP800801970-1972BUHW—Shop this plug
80 HP800 6 cyl.801960-1961B7S0.7Shop this plug
85 HP850851973-1977BUHW—Shop this plug
85 HP850 6 cyl.851962-1964B7S0.7Shop this plug
9.8 HP9.8 hp9.81979-1985B9HS-101.0Shop this plug
9.8 HP1009.81960-1961B6S0.7Shop this plug
9.8 HP1109.81967-1969B7HS0.7Shop this plug
9.8 HP1109.81974 onwardBUHW—Shop this plug
9.9 HP2 Stroke9.91995-2000BP8HS-151.5Shop this plug
9.9 HP208cc Bigfoot, Prockicker9.92001-2011DCPR6E0.9Shop this plug
9.9 HP4 Stroke9.91995-1998CR6HS0.7Shop this plug
90 HP90 hp901987-1998BUHW-2—Shop this plug
90 HP3 cyl.901999-2000BUZHW-2—Shop this plug
90 HP3 cyl. 2 Stroke902001-2006BUZHW-2—Shop this plug
90 HP3 cyl. Optimax 1.5L902003-2011IZFR5J0.8Shop this plug
90 HP4 cyl. 4 Stroke DOHC902000-2006LFR5A-111.1Shop this plug
90 HP4 cyl. 4 Stroke EFI902000-2011LFR5A-111.1Shop this plug
90 HP6 cyl.901979-1986BUHW—Shop this plug
90 HP900901965 onwardB7S0.7Shop this plug
90 HPWalleye Engine L4NA902007 onwardLFR4A-E0.8Shop this plug
95 HP950951966 onwardB7HS0.7Shop this plug
95 HP950SS951966-1967BUHW—Shop this plug
99.9 cu in Twister 11-X Racing99.9 cu in Twister 11-X Racing——BUHW1.3Shop this plug
SST 140 High Performance EngineSST 140 High Performance Engine——BUHW—Shop this plug
XR-2 Magnum High Performance EngineXR-2 Magnum High Performance Engine——BUHW—Shop this plug
500 HP7.6L V12 Verado500CurrentLKAR7G-9—Shop this plug
600 HP7.6L V12 Verado600CurrentLKAR7G-9—Shop this plug
75 HPFourStroke EFI 2.1L Inline-4752014 onwardZFR5F0.8Shop this plug
90 HPFourStroke EFI 2.1L Inline-4902014 onwardZFR5F0.8Shop this plug
115 HPFourStroke EFI 2.1L Inline-41152014 onwardZFR5F0.8Shop this plug
115 HPPro XS FourStroke EFI 2.1L Inline-41152016 onwardZFR5F0.8Shop this plug
150 HPFourStroke EFI 3.0L Inline-41502012 onward—
150 HPPro XS FourStroke EFI 3.0L Inline-41502018 onward—
175 HPFourStroke 3.4L V61752018 onward—
175 HPPro XS FourStroke 3.4L V61752018 onward—
200 HPFourStroke 3.4L V62002018 onward—
200 HPPro XS FourStroke 4.6L V82002018 onward—
225 HPFourStroke 3.4L V62252018 onward—
225 HPPro XS FourStroke 4.6L V82252018 onward—
250 HPFourStroke 4.6L V82502018 onward—
250 HPPro XS FourStroke 4.6L V82502018 onward—
250 HPVerado FourStroke 4.6L V82502018 onward—
300 HPFourStroke 4.6L V83002018 onward—
300 HPPro XS FourStroke 4.6L V83002018 onward—
300 HPVerado FourStroke 4.6L V83002018 onward—
350 HPVerado 5.7L V103502023 onward—
400 HPVerado 5.7L V104002023 onward—
425 HPVerado 5.7L V104252025 onward—
Important: do not select a spark plug using horsepower alone. Confirm the full engine model, Mercury model / description, year, and serial number before ordering. If a row says “Confirm by serial number,” verify the serial before purchasing.

Compatibility reference: Niterra / NGK Mercury application index. Mercury Marine recommends using the engine serial number as the most accurate way to identify parts.