# NGK Spark Plugs: Johnson Outboards ## NGK Spark Plugs: Johnson Outboards 229 spark plug applications from NGK's marine catalogue, for the engines we supply parts for. Each line gives the plug NGK specifies, the iridium upgrade where one exists, and the electrode gap. **Check the gap before you fit.** Plugs are not always gapped correctly out of the box, and the wrong gap causes misfire and hard starting. Where a resistor plug is specified, fit a resistor plug — a non-resistor substitute can interfere with a tacho, sounder or engine electronics. - [Johnson](#johnson) - [Outboard Marine](#outboard-marine) ### Johnson 221 applications Model Engine / details NGK plug Iridium upgrade Gap 1 HP 1 · 1R Standard Ign. · 68→70 B6S 0.8 mm 1.1 HP 1.1 · 46→47 B-4L 0.8 mm 1.2 HP 1.2 · Magneto · 86→90 B6S 0.8 mm 1.5 HP 1.5 · Standard Ign. · 68→70 B6S 0.8 mm 2 HP 2 · 2R Standard Ign. · 68→84 B6S 0.8 mm 2 HP 2 · Aquanaut Diving unit Standard Ign. · 66→70 BM4A 0.8 mm 2 HP 2 · Colt, Jr · 71→90 B6S 0.8 mm 2 HP 2 · Excel 4, Ultra · 87→88 B7HS BR7HIX 0.8 mm 2 HP 2 · 1-Cyl. · 91→01 BPR6HS BPR6HIX 0.8 mm 2.3 HP 2.3 · 1-Cyl. · 91→98 BPR6HS BPR6HIX 0.8 mm 2.5 HP 2.5 · 87→88 BR6HS BR6HIX 0.8 mm 3 HP 3 · Lightwin Standard Ign. · 52→74 B6S 0.8 mm 3 HP 3 · 2-Cyl. · 89→97 BR6HS BR6HIX 0.8 mm 3.3 HP 3.3 · Standard Ign. · 48→51 B6S 0.8 mm 3.3 HP 3.3 · 1-Cyl. · 91→03 BPR6HS BPR6HIX 0.8 mm 3.5 HP 3.5 · 01→02 BPR6HS BPR6HIX 0.8 mm 3.5 HP 3.5 · 04→05 BP7HS BPR7HIX 0.5 mm 4 HP 4 · V4, V4A, V4M, V4S, VX, VXH Standard · 58→67 B6S 0.8 mm 4 HP 4 · Incl. 4R, 4W Standard Ign. · 69→76 B6S 0.8 mm 4 HP 4 · 12.7 mm reach plugs · 77→87 BR6HS BR6HIX 0.8 mm 4 HP 4 · Excel, Ultra 12.7 mm reach plugs · 87→88 BZ7HS-10 0.8 mm 4 HP 4 · 12.7 mm reach plugs · 2-Cyl. · 89→03 BR6HS BR6HIX 0.8 mm 4 HP 4 · 19 mm reach plugs · 04→05 BPR6ES BPR6EIX 0.9 mm 4.5 HP 4.5 · 80→85 BR6HS BR6HIX 0.8 mm 5 HP 5 · Angler · 65→68 B6S 0.8 mm 5 HP 5 · 90→97 BR6HS BR6HIX 0.8 mm 5 HP 5 · Dia. 12 mm plug · 4-Stroke · 97→03 D6HA 0.7 mm 5 HP 5 · Dia. 14 mm plug · 1-Cyl. · 98→01 BZ7HS-10 0.8 mm 5 HP 5 · 19 mm reach plugs · 04→05 BPR6ES BPR6EIX 0.9 mm 5.2 HP 5.2 · Lightwin · 52→74 B6S 0.8 mm 5.5 HP 5.5 · Standard Ign. · 56→64 B6S 0.8 mm 6 HP 6 · Incl. 6R, 6RL Standard Ign. · 65→76 B6S 0.8 mm 6 HP 6 · Dia. 14 mm, 12.7 mm reach plugs · 2-Stroke · 77→01 BR6HS BR6HIX 0.8 mm 6 HP 6 · Dia. 12 mm, 12.7 mm reach plugs · 4-Stroke · 97→03 D6HA 0.7 mm 6 HP 6 · RLSRS, RSRS 12.7 mm reach plugs · 04→ BR6HS BR6HIX 0.8 mm 6 HP 6 · 19 mm reach plugs · 05→ BPR6ES BPR6EIX 0.9 mm 6.5 HP 6.5 · COM · 81→93 BR6HS BR6HIX 0.8 mm 7.5 HP 7.5 · Standard Ign. · 52→58 B6S 0.8 mm 7.5 HP 7.5 · 77→97 BR6HS BR6HIX 0.8 mm 8 HP 8 · Incl. COM Dia. 14 mm plug · 2-Stroke · 77→01 BR6HS BR6HIX 0.8 mm 8 HP 8 · Dia. 12 mm plug · 4-Stroke 211cc · 96→03 D6HA 0.7 mm 8 HP 8 · Dia. 12 mm plug · 4-Stroke SOHC · 02→ DR5HS 0.7 mm 8 HP 8 · Incl. RLSRC, RSRC Dia. 14 mm plug · 04→ BR6HS BR6HIX 0.8 mm 9 HP 9 · 9R, 9RL, 9EL Standard Ign. · 74→ BZ7HS-10 0.8 mm 9.5 HP 9.5 · Standard Ign. · 52→73 B6S 0.8 mm 9.7 HP 9.7 · Standard Ign. · 42→49 AB-6 0.8 mm 9.9 HP 9.9 · 74→76 B7HS BR7HIX 0.8 mm 9.9 HP 9.9 · 2-Stroke OHC · 77→01 BR7HS BR7HIX 0.8 mm 9.9 HP 9.9 · 2-Stroke SOHC · 02→04 DCPR7E DCPR7EIX 0.8 mm 9.9 HP 9.9 · 4-Stroke OHC 302cc · 02→04 DCPR7E DCPR7EIX 0.8 mm 10 HP 10 · Standard Ign. · 52→63 B6S 0.8 mm 10 HP 10 · 10E, 10EL, 10R, 10RL Standard Ign. · 75→76 BZ7HS-10 0.8 mm 10 HP 10 · COM · 92→93 BZ7HS-10 0.8 mm 10 HP 10 · COM · 94→02 BR7HS BR7HIX 0.8 mm 10 HP 10 · BL4STC, BL4STS Dia. 12 mm plug · 03→ DCPR6E 0.9 mm 10 HP 10 · EL4SOR · 05→ BKR6ES BKR6EIX 0.8 mm 10 HP 10 · EL4SRC Dia. 12 mm plug · 03→ DCPR6E 0.9 mm 10 HP 10 · L4SOA Dia. 14 mm, 19 mm reach plugs · 05→ BKR6ES BKR6EIX 0.8 mm 10 HP 10 · L4STC, LE4STS Dia. 12 mm plug · 03→ DCPR6E 0.9 mm 10 HP 10 · R4SOA Dia. 14 mm, 19 mm reach plugs · 05→ BKR6ES BKR6EIX 0.8 mm 10 HP 10 · R4SR, R4STC, RBL4SR, RE4SR, · 03→ DCPR6E 0.9 mm 10 HP 10 · RHLSOR, RHLSRC, RHLSTS · 03→ BR7HS BR7HIX 0.8 mm 10 HP 10 · RHSOR, RHSRC, RHSTS · 03→ BR7HS BR7HIX 0.8 mm 10 HP 10 · RL4SR Dia. 12 mm plug · 03→ DCPR6E 0.9 mm 10 HP 10 · RLSOS, RLSRD, RLSTE · 03→ BR7HS BR7HIX 0.8 mm 10 HP 10 · RSOS, RSRD, RSTE · 03→ BR7HS BR7HIX 0.8 mm 10 HP 10 · TBL4SOB, TE4SOA, TEL4SOA · 05→ BKR6ES BKR6EIX 0.8 mm 10 HP 10 · TEL4SR, TEL4STC Dia. 12 mm plug · 03→ DCPR6E 0.9 mm 14 HP 14 · Fastwin · 50→72 B6S 0.8 mm 14 HP 14 · Incl. COM · 81→91 BZ7HS-10 0.8 mm 15 HP 15 · Standard Ign. · 54→56 BR6S 0.8 mm 15 HP 15 · 9.5 mm reach plugs · 56→71 B6S 0.8 mm 15 HP 15 · 15E, 15EL, 15R, 15RL, COM · 74→93 BZ7HS-10 0.8 mm 15 HP 15 · Incl. COM Dia. 14 mm plug · 2-Stroke · 94→01 BR7HS BR7HIX 0.8 mm 15 HP 15 · Dia. 12 mm plug · 4-Stroke OHC · 95→03 DCPR7E DCPR7EIX 0.8 mm 15 HP 15 · L4SR, R4SR, TE4SR, TEL4SR · 04→ DCPR6E 0.9 mm 15 HP 15 · LSRS, RSRS, WRLSRM, WRSRM · 04→ BR7HS BR7HIX 0.8 mm 15 HP 15 · Dia. 14 mm, 19 mm reach plugs · 05→ BKR6ES BKR6EIX 0.8 mm 18 HP 18 · (Excl. Fastwin) Standard Ign. · 57→73 BR6S 0.8 mm 18 HP 18 · Jet · 2-Cyl. · 95→98 BR7HS BR7HIX 0.8 mm 20 HP 20 · 20R, 20RL, 25R, 25RL Standard Ign. · 66→78 B6S 0.8 mm 20 HP 20 · 2-Cyl. · 78→98 BR7HS BR7HIX 0.8 mm 20 HP 20 · Jet · 2-Cyl. · 99→01 BR7HS BR7HIX 0.8 mm 25 HP 25 · Incl. 20R, 25E, 25EL, 25R, 25RL · 52→76 B6S 0.8 mm 25 HP 25 · (Excl. COM) · 2-Cyl. · 77→02 BR7HS BR7HIX 0.8 mm 25 HP 25 · 3-Cyl. · 95→01 BR6HS BR6HIX 0.8 mm 25 HP 25 · 03→05 BZ7HS-10 0.8 mm 28 HP 28 · Standard Ign. · 62→64 B6S 0.8 mm 28 HP 28 · SPL (Excl. Jet) · 2-Cyl. · 78→97 BR7HS BR7HIX 0.8 mm 28 HP 28 · Jet · 92→03 BPZ8HS-10 0.8 mm 30 HP 30 · Standard Ign. · 56→71 BR6S 0.8 mm 30 HP 30 · (Excl. Jet) · 2-Cyl. · 78→02 BR7HS BR7HIX 0.8 mm 30 HP 30 · Jet · 2-Cyl. · 99→01 BPR7HS BPR7HIX 0.8 mm 30 HP 30 · 4-Stroke OHC · 95→03 DCPR7E DCPR7EIX 0.8 mm 30 HP 30 · 04→05 BZ7HS-10 0.8 mm 33 HP 33 · Standard Ign. · 69→70 B6S 0.8 mm 35 HP 35 · Standard Ign. · 57→70 B6S 0.8 mm 35 HP 35 · E, EL, R, RL (Excl. Jet) Standard Ign. · 2-Cyl. · 77→97 BZ7HS-10 0.8 mm 35 HP 35 · Jet · 2-Cyl. · 93→03 BPZ8HS-10 0.8 mm 35 HP 35 · 3-Cyl. · 95→01 BR7HS BR7HIX 0.8 mm 40 HP 40 · Incl. 40E, 40EL, 40R, 40RL (Excl. 40ES) · 60→73 B6S 0.8 mm 40 HP 40 · 40ES Standard Ign. · 69→71 BR6S 0.8 mm 40 HP 40 · 40E, 40EL, 40R, 40RL Standard Ign. · 74→76 BZ7HS-10 0.8 mm 40 HP 40 · (Excl. COM) · 2-Cyl. · 80→88 BZ7HS-10 0.8 mm 40 HP 40 · (Excl. COM) · 2-Cyl. · 89→02 BPZ8HS-10 0.8 mm 40 HP 40 · COM · 43 cu.inch · 81→90 B7HS BR7HIX 0.8 mm 40 HP 40 · Jet · 3-Cyl. · 99→01 BPR7HS BPR7HIX 0.8 mm 40 HP 40 · Dia. 12 mm plug · 4-Stroke DOHC · 02→03 DCPR7E DCPR7EIX 0.8 mm 40 HP 40 · PL4SRM, PL4SRS Dia. 12 mm plug · 04→ DCPR6E 0.9 mm 40 HP 40 · PLSRS, RLSRS, RSRS Dia. 14 mm plug · 04→ BZ7HS-10 0.8 mm 48 HP 48 · 2-Cyl. · 80→88 BZ7HS-10 0.8 mm 48 HP 48 · Incl. SPL · 2-Cyl. · 89→97 BPZ8HS-10 0.8 mm 50 HP 50 · Standard Ign. · 58→59 B6S 0.8 mm 50 HP 50 · Sizzler · 71→75 B7HS BR7HIX 0.8 mm 50 HP 50 · 2-Cyl. · 80→88 BZ7HS-10 0.8 mm 50 HP 50 · 2-Cyl. · 89→97 BPZ8HS-10 0.8 mm 50 HP 50 · 2-Cyl. · 98→ BPR7HS BPR7HIX 0.8 mm 50 HP 50 · 3-Cyl. · 95→98 BPZ8HS-10 0.8 mm 50 HP 50 · 3-Cyl. 815cc · 02→04 DCPR7E DCPR7EIX 0.7 mm 50 HP 50 · 05→ DCPR6E 0.9 mm 50 HP 50 · PL4SRM, PL4SRS, PL4STC · 03→ DCPR6E 0.9 mm 50 HP 50 · PLSRS, PLSTD Dia. 14 mm plug · 03→ BZ7HS-10 0.8 mm 55 HP 55 · 3-Cyl. · 68→69 BZ7HS-10 0.8 mm 55 HP 55 · 2-Cyl. · 76→89 B7HS BR7HIX 0.8 mm 55 HP 55 · COM · 2-Cyl. · 94→95 BPZ8HS-10 0.8 mm 60 HP 60 · Standard Ign. · V4 · 64→67 B6S 0.8 mm 60 HP 60 · 3-Cyl. 49, 56 cu.inch · 75→93 BZ7HS-10 0.8 mm 60 HP 60 · 2-Cyl. · 80→85 BZ7HS-10 0.8 mm 60 HP 60 · 3-Cyl. 56 cu.inch · 94→98 BPZ8HS-10 0.8 mm 60 HP 60 · 99→01 BZ7HS-10 0.8 mm 60 HP 60 · 4-Stroke OHC · 02→05 BPR6ES BPR6EIX 0.9 mm 65 HP 65 · Sportfour · V4 · 68→ BZ7HS-10 0.8 mm 65 HP 65 · 3-Cyl. · 72→73 BZ7HS-10 0.8 mm 65 HP 65 · COM HC LC · 84→87 BZ7HS-10 0.8 mm 65 HP 65 · COM · 3-Cyl. · 94→95 BPZ8HS-10 0.8 mm 65 HP 65 · Jet CV4 · 92→97 BR7HS BR7HIX 0.8 mm 70 HP 70 · 3-Cyl. 49, 56 cu.inch · 75→93 BZ7HS-10 0.8 mm 70 HP 70 · 3-Cyl. 56 cu.inch · 94→01 BPZ8HS-10 0.8 mm 70 HP 70 · 02→05 BPR6ES BPR6EIX 0.9 mm 75 HP 75 · Standard Ign. · V4 · 60→65 B6S 0.8 mm 75 HP 75 · 75→89 BZ7HS-10 0.8 mm 80 HP 80 · (Excl. Starfire) Standard Ign. · 66→67 B6S 0.8 mm 80 HP 80 · Starfire · 66→67 B8S 0.8 mm 80 HP 80 · Jet CV4 · 79→01 BR7HS BR7HIX 0.8 mm 85 HP 85 · 68→80 B7HS BR7HIX 0.8 mm 85 HP 85 · (Excl. CV4) · 86→93 BZ7HS-10 0.8 mm 85 HP 85 · CV4 SPL · 79→97 BR7HS BR7HIX 0.8 mm 85 HP 85 · Backtroller · V4 · 94→95 BR7HS BR7HIX 0.8 mm 90 HP 90 · Standard Ign. · 64→65 B6S 0.8 mm 90 HP 90 · CV4 Incl. Turbojet · 79→98 BR7HS BR7HIX 0.8 mm 90 HP 90 · LV4 (Excl. F.F.I.) · 95→00 BPZ8HS-10 0.8 mm 90 HP 90 · LV4 F.F.I. · 98→ PZFR6H 0.8 mm 90 HP 90 · Carb. · 01→02 BZ7HS-10 0.8 mm 90 HP 90 · GLSOB 19 mm reach plugs · 05→ BKR6ES BKR6EIX 0.8 mm 90 HP 90 · GLSRM, GLSTA 12.7 mm reach plugs · 03→ BZ7HS-10 0.8 mm 90 HP 90 · PL4SOR, PLSOA, PLSRR, PLSTC · 03→ BZ7HS-10 0.8 mm 90 HP 90 · PL4SRC, PL4STC 19 mm reach plugs · 03→ BKR6ES BKR6EIX 0.8 mm 90 HP 90 · PX4SOR, PX4SRC, PX4STC · 03→ BKR6ES BKR6EIX 0.8 mm 90 HP 90 · PXSOC, PXSRS 12.7 mm reach plugs · 04→ BZ7HS-10 0.8 mm 100 HP 100 · (Excl. Starfire) Standard Ign. · 66→72 B6S 0.8 mm 100 HP 100 · Starfire · 67→72 B7HS BR7HIX 0.8 mm 100 HP 100 · V4 · 79→80 B7HS BR7HIX 0.8 mm 105 HP 105 · COM LV4, LV6 Jet · 93→03 BPZ8HS-10 0.8 mm 110 HP 110 · CV4 · 79→97 BR7HS BR7HIX 0.8 mm 112 HP 112 · CV4 · 79→97 BR7HS BR7HIX 0.8 mm 115 HP 115 · 69→70 B7HS BR7HIX 0.8 mm 115 HP 115 · (Excl. COM) · 73→79 BZ7HS-10 0.8 mm 115 HP 115 · COM · 75→84 B7HS BR7HIX 0.8 mm 115 HP 115 · CV4 Incl. Turbojet · 79→98 BR7HS BR7HIX 0.8 mm 115 HP 115 · Fast Strike LV4 (Excl. F.F.I.) · 95→02 BPZ8HS-10 0.8 mm 115 HP 115 · LV4 F.F.I. · 98→02 PZFR6H 0.8 mm 115 HP 115 · 5X4SRC 19 mm reach plugs · 04→ BKR6ES BKR6EIX 0.8 mm 115 HP 115 · GLSOB, GLSRC, GLSTA · 03→ BPZ8HS-10 0.8 mm 115 HP 115 · L4SRC, L4STS 19 mm reach plugs · 03→ BKR6ES BKR6EIX 0.8 mm 115 HP 115 · PL450R, PL4SRC, PL4STS · 03→ BKR6ES BKR6EIX 0.8 mm 115 HP 115 · PLSOR, PLSRC, PLSTS · 03→ BPZ8HS-10 0.8 mm 115 HP 115 · PX450R, PX4SRC, PX4STS · 03→ BKR6ES BKR6EIX 0.8 mm 115 HP 115 · PXSOR, PXSRM, PXSTS · 03→ BPZ8HS-10 0.8 mm 115 HP 115 · WPLSOC, WPLSRS · 04→ BPZ8HS-10 0.8 mm 115 HP 115 · X4STS 19 mm reach plugs · 03→ BKR6ES BKR6EIX 0.8 mm 120 HP 120 · LV4 · 85→03 BPZ8HS-10 0.8 mm 125 HP 125 · COM · 71→72 B7HS BR7HIX 0.8 mm 130 HP 130 · LV4 · 85→03 BPZ8HS-10 0.8 mm 140 HP 140 · LV4 · 85→02 BPZ8HS-10 0.8 mm 140 HP 140 · 03→05 BKR6ES BKR6EIX 0.8 mm 150 HP 150 · CV6 · 88→91 BZ7HS-10 0.8 mm 150 HP 150 · COM, Fast Strike LV6 (Excl. F.F.I.) · 91→01 BPZ8HS-10 0.8 mm 150 HP 150 · LV6 F.F.I. · 97→98 PZFR6H 0.8 mm 150 HP 150 · Carb. · 02→06 BPZ8HS-10 0.8 mm 155 HP 155 · COM, CV6 · 78→92 BUZ8H 175 HP 175 · CV6 · 88→91 BZ7HS-10 0.8 mm 175 HP 175 · Fast Strike LV6 (Excl. F.F.I.) · 91→06 BPZ8HS-10 0.8 mm 175 HP 175 · LV6 F.F.I. · 98→ PZFR6H 0.8 mm 185 HP 185 · 77→87 BUZ8H 185 HP 185 · COM · 90→93 BZ7HS-10 0.8 mm 200 HP 200 · 76→83 BUZ8H 200 HP 200 · V6 · 86→93 BZ7HS-10 0.8 mm 200 HP 200 · COM · 92→93 BUZ8H 200 HP 200 · COM · 93→98 BPZ8HS-10 0.8 mm 200 HP 200 · Venom LV6 · 94→03 BPZ8HS-10 0.8 mm 200 HP 200 · (Excl. DI) · 04→05 BKR6ES BKR6EIX 0.8 mm 200 HP 200 · LV6 DI · 04→ PZFR6H 0.8 mm 225 HP 225 · V6 · 86→93 BZ7HS-10 0.8 mm 225 HP 225 · Venom LV6 · 94→01 BPZ8HS-10 0.8 mm 225 HP 225 · (Excl. DI) · 04→05 BKR6ES BKR6EIX 0.8 mm 225 HP 225 · LV6 DI · 04→ PZFR6H 0.8 mm 250 HP 250 · V8 · 85→97 BPZ8HS-10 0.8 mm 275 HP 275 · 85→88 BPR7HS BPR7HIX 0.8 mm 300 HP 300 · V8 · 85→97 BPZ8HS-10 0.8 mm 300 HP 300 · Sea Drive · 88→92 BZ7HS-10 0.8 mm 3.6L 85→86 BZ7HS-10 0.8 mm AIR BUOY Diving unit Standard Ign. BM4A 0.6 mm All models Standard Ign. Dia. 18 mm plug · 39→50 AB-6 0.8 mm All models AD, JW, QD, TN, V4H, V4ML · 52→68 B6S 0.8 mm All models CD, JH Standard Ign. · 54→68 B6S 0.8 mm All models FD, FDE Standard Ign. · 56→68 B6S 0.8 mm All models LD, MQ Standard Ign. · 64→68 B6S 0.8 mm All models JHF, JWF Standard Ign. · 67→68 B6S 0.8 mm All models RD, RDE, RDS, RJE, RK Standard Ign. · 51→68 B6S 0.8 mm All models RX, RXE Standard Ign. · 62→68 B6S 0.8 mm All models SC Standard Ign. · 68→ B6S 0.8 mm Parts for these engines: [Johnson parts](/collections/evinrude-johnson-outboard-parts-brp-marine-engine-parts-components). ### Outboard Marine 8 applications Model Engine / details NGK plug Iridium upgrade Gap 1.6L 84→92 BZ7HS-10 0.8 mm 1.8L 84→92 BZ7HS-10 0.8 mm 2.0L 90→92 BZ7HS-10 0.8 mm 2.3L 90→92 BZ7HS-10 0.8 mm 2.6L 84→90 BZ7HS-10 0.8 mm 2.7L 84→90 BZ7HS-10 0.8 mm 3.6L 84→90 BZ7HS-10 0.8 mm 4.0L 90→91 BZ7HS-10 0.8 mm Parts for these engines: [Outboard Marine parts](/collections/evinrude-johnson-outboard-parts-brp-marine-engine-parts-components). ### Reading the plug codes An NGK code describes the plug's construction. The digit in the middle is the heat rating — a **higher number is a colder plug**, which is the opposite of most other brands. An **R** after the first letters means a resistor plug. Codes ending **IX** are the Iridium IX range, a direct upgrade with a finer centre electrode. A **Y-** prefix is a diesel glow plug, not a spark plug, and has no gap. Do not substitute a hotter or colder plug to cure a running problem. A plug reading the wrong colour is telling you about the fuel, ignition or oil — changing heat range hides it rather than fixing it. ### Other engines - [Mercury](/pages/ngk-spark-plugs-mercury-outboards) - [Mariner / Force](/pages/ngk-spark-plugs-mariner-force-outboards) - [Yamaha](/pages/ngk-spark-plugs-yamaha-outboards) - [Suzuki](/pages/ngk-spark-plugs-suzuki-outboards) - [Evinrude / OMC](/pages/ngk-spark-plugs-evinrude-omc-outboards) - [Tohatsu / Nissan](/pages/ngk-spark-plugs-tohatsu-nissan-outboards) - [Honda / Volvo Penta / others](/pages/ngk-spark-plugs-honda-volvo-penta-outboards) - [MerCruiser inboard](/pages/ngk-spark-plugs-mercruiser-inboard) - [Other inboards](/pages/ngk-spark-plugs-inboard-sterndrive) - [PWC & jet ski](/pages/ngk-spark-plugs-pwc-jet-ski) ### Not sure which plug you need? Model families ran across several specifications and the year or serial usually decides which line applies. Ring [0412 532 984](tel:+61412532984) with your engine and serial number and we will confirm the plug, the gap and how many you need. Our other workshop charts are on the [reference charts page](/pages/resources), and the how-and-why lives in our [boat maintenance guides](/blogs/guides). Applications compiled from NGK's published marine application guide and reproduced here as reference data. NGK's own guide is the authority; always confirm against your engine's manual. Listings do not apply to racing or modified engines. --- > Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/pages/ngk-spark-plugs-johnson-outboards)