# NGK Spark Plugs: Mariner & Force Outboards ## NGK Spark Plugs: Mariner & Force Outboards 163 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. - [Mariner](#mariner) - [Force](#force-u-s-marine) ### Mariner 144 applications Model Engine / details NGK plug Iridium upgrade Gap 2 HP 2 · 2A 646 B6HS BR6HIX 0.6 mm 2 HP 2 · 2B 6A1 · E: To: M-011 600 B6HS BR6HIX 0.6 mm 2 HP 2 · 2B 6A1 · E: M-011 601 on B5HS 0.6 mm 2.5 HP 2.5 · 2-Stroke 75cc 3Kw · 89→97 B6HS BR6HIX 0.6 mm 2.5 HP 2.5 · 98→ BPR6HS BPR6HIX 0.8 mm 3 HP 3 · 90→92 B6HS BR6HIX 0.6 mm 3.3 HP 3.3 · 93→02 BPR6HS-10 BPR6HIX 1.0 mm 3.5 HP 3.5 · 642 · E: To: M-23 740, ML-41 690 B7HS BR7HIX 0.6 mm 3.5 HP 3.5 · 642 · E: M-23 741, ML-41 691 on B6HS BR6HIX 0.6 mm 4 HP 4 · 4A 6E0 · 2-Stroke · →89 B7HS BR7HIX 0.6 mm 4 HP 4 · 2-Stroke · 90→97 BR7HS BR7HIX 0.9 mm 4 HP 4 · 2-Stroke · 98→02 BPR7HS-10 BPR7HIX 1.0 mm 4 HP 4 · Sailmate · 4-Stroke 123cc · 99→02 DCPR7E DCPR7EIX 0.9 mm 5 HP 5 · 5A 661, 5B 661, 5C 6E3 · 2-Stroke · →89 B7HS BR7HIX 0.6 mm 5 HP 5 · 2-Stroke · 90→97 BR7HS BR7HIX 0.9 mm 5 HP 5 · 2-Stroke · 98→02 BPR7HS-10 BPR7HIX 1.0 mm 5 HP 5 · 4-Stroke · 99→02 DCPR6E 0.9 mm 6 HP 6 · 6C 6H8, 6D 6H6 · 2-Stroke B7HS BR7HIX 0.8 mm 6 HP 6 · 2-Stroke · 87→92 BP8HS-10 BPR8HIX 1.0 mm 6 HP 6 · 2-Stroke · 92→02 BP8H-N-10 BPR8HIX 1.0 mm 6 HP 6 · 4-Stroke · 92→02 DCPR6E 0.9 mm 8 HP 8 · 2-Cyl. · 87→92 BP8HS-10 BPR8HIX 1.0 mm 8 HP 8 · 93→02 BP8H-N-10 BPR8HIX 1.0 mm 8 HP 8 · Bodensee · 95→99 CR6HS CR6HIX 0.7 mm 8 HP 8 · 8A 647, 655 · 91→95 B6HS BR6HIX 0.6 mm 8 HP 8 · 8B 677 B7HS BR7HIX 0.6 mm 8 HP 8 · 8C 6G1 · 91→95 B7HS BR7HIX 0.8 mm 8 HP 8 · K8 680 · 91→00 B6HS BR6HIX 0.6 mm 8 HP 8 · Marathon, W8 677 · 91→95 B7HS BR7HIX 0.6 mm 9.9 HP 9.9 · 9.9C 682 CDI · 2-Stroke B7HS BR7HIX 0.8 mm 9.9 HP 9.9 · Dia. 14 mm plug · 2-Stroke · 87→94 BP8HS-10 BPR8HIX 1.0 mm 9.9 HP 9.9 · Dia. 14 mm plug · 2-Stroke · 95→00 BP8HS-15 1.5 mm 9.9 HP 9.9 · Dia. 12 mm plug · 4-Stroke · 99→02 DPR6EA-9 0.9 mm 9.9 HP 9.9 · Big Foot, Sail Power Dia. 10 mm plug · 4-Stroke · 95→02 CR6HS CR6HIX 0.7 mm 10 HP 10 · Magnum, Marathon · 91→02 BP8HS-15 1.5 mm 15 HP 15 · Dia. 14 mm plug · 2-Cyl. · 89→02 BP8HS-15 1.5 mm 15 HP 15 · Dia. 12 mm plug · 4-Stroke · 98→02 DPR6EA-9 0.9 mm 15 HP 15 · 15A 651 B7HS BR7HIX 0.6 mm 15 HP 15 · 15C 684 (Excl. CDI) B7HS BR7HIX 0.6 mm 15 HP 15 · 15C 684 CDI B7HS BR7HIX 0.8 mm 15 HP 15 · K15 669 B6HS BR6HIX 0.6 mm 15 HP 15 · K15 6K4, 6M7 · 84→00 B7HS BR7HIX 0.8 mm 15 HP 15 · Marathon (Excl. 684) · 92→96 BP8H-N-10 BPR8HIX 1.0 mm 15 HP 15 · Marathon (Excl. 684) · 97→02 BP8HS-15 1.5 mm 15 HP 15 · Marathon 684 (Excl. CDI) · 92→ B7HS BR7HIX 0.6 mm 15 HP 15 · Marathon 684 CDI B7HS-10 BR7HIX 0.9 mm 15 HP 15 · W15 662 B7HS BR7HIX 0.6 mm 15 HP 15 · W15 684 B7HS-10 BR7HIX 0.9 mm 20 HP 20 · Incl. Jet Dia. 14 mm plug · 85→02 BP8H-N-10 BPR8HIX 1.0 mm 20 HP 20 · Hi-Ign. Dia. 12 mm plug · 85→97 DCPR6E 0.9 mm 20 HP 20 · 20A 653 B6HS BR6HIX 0.6 mm 20 HP 20 · 20C 6A9 B7HS BR7HIX 0.6 mm 25 HP 25 · Incl. Marathon (Excl. 648, 694, 695) · 85→01 BP8H-N-10 BPR8HIX 1.0 mm 25 HP 25 · 92→ BU8H 25 HP 25 · Dia. 12 mm plug · 4-Stroke · 98→02 DPR6EA-9 0.9 mm 25 HP 25 · Marathon 648, 694, 695 · 93→96 B7HS BR7HIX 0.6 mm 25 HP 25 · 25A 648, 25B 690, 25C 695 B7HS BR7HIX 0.6 mm 25 HP 25 · K25 6A4 · 97→00 B7HS BR7HIX 0.6 mm 25 HP 25 · W25 648, W25 694, W25 695 · 92→96 B7HS BR7HIX 0.6 mm 28 HP 28 · 664 B7HS BR7HIX 0.6 mm 30 HP 30 · Dia. 14 mm plug · 95→00 BP8H-N-10 BPR8HIX 1.0 mm 30 HP 30 · Dia. 12 mm plug · 2-Cyl. 4-Stroke · 99→02 DPR6EA-9 0.9 mm 30 HP 30 · Jet · 3-Cyl. · 98→01 BP8H-N-10 BPR8HIX 1.0 mm 30 HP 30 · Marathon (Excl. 698B) · 95→02 BP8H-N-10 BPR8HIX 1.0 mm 30 HP 30 · Marathon 698B B7HS BR7HIX 0.6 mm 30 HP 30 · 30A 689 · 92→94 B7HS BR7HIX 0.6 mm 30 HP 30 · W30 689A, 689B · 92→93 B7HS BR7HIX 0.6 mm 40 HP 40 · 2-Cyl. · 98→01 BP8H-N-10 BPR8HIX 1.0 mm 40 HP 40 · Dia. 14 mm plug · 3-Cyl. · 98→01 BP8H-N-10 BPR8HIX 1.0 mm 40 HP 40 · Dia. 12 mm plug · 3-Cyl. 747cc 4-Stroke · 98→01 DPR6EA-9 0.9 mm 40 HP 40 · Dia. 12 mm plug · 3-Cyl. 747cc 4-Stroke · 02→ DCPR7E DCPR7EIX 0.9 mm 40 HP 40 · Dia. 12 mm plug · 4-Cyl. 995cc · 98→01 DPR6EA-9 0.9 mm 40 HP 40 · (Excl. Bigfoot) Dia. 12 mm plug · 4-Cyl. 995cc · 02→ DCPR7E DCPR7EIX 0.9 mm 40 HP 40 · Bigfoot · 4-Stroke 995cc 30Kw · 00→ DCPR6E 0.9 mm 40 HP 40 · Marathon 6F6 · 85→94 B7HS BR7HIX 0.6 mm 40 HP 40 · Marathon · 2-Cyl. · 95→02 BP8H-N-10 BPR8HIX 1.0 mm 40 HP 40 · 40A 676A, 40B 675B, 40C 6E9 · 81→94 B8HS BR8HIX 0.6 mm 40 HP 40 · K40 6F5 · 2-Cyl. · 84→00 B7HS BR7HIX 0.6 mm 40 HP 40 · W40 676A · 92→96 B8HS BR8HIX 0.6 mm 40 HP 40 · W40 6F6 · 97→ B7HS BR7HIX 0.6 mm 45 HP 45 · Bodensee · 4-Cyl. · 95→98 DPR6EA-9 0.9 mm 45 HP 45 · Jet · 3-Cyl. · 95→01 BP8H-N-10 BPR8HIX 1.0 mm 48 HP 48 · W48 670 B7HS BR7HIX 0.6 mm 50 HP 50 · 3-Cyl. 849cc · 91→01 BP8H-N-10 BPR8HIX 1.0 mm 50 HP 50 · 4-Cyl. 4-Stroke 935cc · 95→01 DPR6EA-9 0.9 mm 50 HP 50 · Bigfoot · 4-Stroke 995cc · 00→ DPR6EA-9 0.9 mm 55 HP 55 · Marathon (Excl. 663) · 91→02 BP8H-N-10 BPR8HIX 1.0 mm 55 HP 55 · Marathon 663 B8HS BR8HIX 0.6 mm 55 HP 55 · M55 663 · E: To: E-004 040, EL-315 378 B8HS BR8HIX 0.6 mm 55 HP 55 · M55 663 · E: E-004 041, EL-315 379 on B8HS-10 BR8HIX 0.9 mm 55 HP 55 · W55 663 B8HS BR8HIX 0.6 mm 60 HP 60 · 91→01 BP8H-N-10 BPR8HIX 1.0 mm 60 HP 60 · 3-Cyl. 967cc 2-Stroke · 98→ BPR7HS-10 BPR7HIX 1.0 mm 60 HP 60 · 4-Cyl. (Excl. EFI) · 01→ DPR6EA-9 0.9 mm 60 HP 60 · 4-Cyl. EFI · 02→ DCPR7E DCPR7EIX 0.9 mm 60 HP 60 · 675 · E: To: L-302 050 B8HS BR8HIX 0.6 mm 60 HP 60 · 675 · E: L-302 051 on B8HS-10 BR8HIX 0.9 mm 60 HP 60 · 675 · E: To: S-000 780 B8HS BR8HIX 0.6 mm 60 HP 60 · 675 · E: S-000 781 on B8HS-10 BR8HIX 0.9 mm 60 HP 60 · 6F0 · 91→97 B8HS-10 BR8HIX 0.9 mm 60 HP 60 · Big Foot · 95→99 BP8H-N-10 BPR8HIX 1.0 mm 60 HP 60 · E, EL · 2-Cyl. BR8HS-10 BR8HIX 1.0 mm 60 HP 60 · Marathon · 95→02 BP8H-N-10 BPR8HIX 1.0 mm 75 HP 75 · 4-Cyl. 4-Stroke · 00→06 LFR5AP-11 1.1 mm 80 HP 80 · Jet · 95→01 BP8H-N-10 BPR8HIX 1.0 mm 90 HP 90 · 4-Stroke · 00→ LFR5AP-11 1.1 mm 100 HP 100 · 88→99 BP8H-N-10 BPR8HIX 1.0 mm 105 HP 105 · Jet · 6-Cyl. · 95→99 BU8H 115 HP 115 · (Excl. OptiMax) · 4-Cyl. 2-Stroke · 89→02 BP8H-N-10 BPR8HIX 1.0 mm 115 HP 115 · OptiMax · 00→04 PZFR5F-11 ZFR5FIX-11 1.0 mm 125 HP 125 · 4-Cyl. · 94→02 BP8H-N-10 BPR8HIX 1.0 mm 135 HP 135 · Incl. Marathon, Work · 86→99 BU8H 135 HP 135 · OptiMax · 98→02 PZFR5F-11 ZFR5FIX-11 1.0 mm 135 HP 135 · V6 · 98→ BPR7HS-10 BPR7HIX 1.0 mm 135 HP 135 · 00→01 BPZ8HS-10 1.0 mm 140 HP 140 · Jet · 95→99 BU8H 150 HP 150 · DFI · 97→ ZFR6F-11 ZFR6FIX-11 1.1 mm 150 HP 150 · 150, V150, W150 · 79→99 BU8H 150 HP 150 · 150, V150, W150 · 00→01 BPZ8HS-10 1.0 mm 150 HP 150 · Magnum (Incl. II, III, Super Magnum) · Incl. EFI · 88→99 BU8H 150 HP 150 · Magnum I, II · EFI · 00→ BPR7HS-10 BPR7HIX 1.0 mm 150 HP 150 · OptiMax · 97→02 PZFR5F-11 ZFR5FIX-11 1.0 mm 150 HP 150 · 2-Stroke V6 RFI 2507cc · →99 BU8H 150 HP 150 · 2-Stroke V6 EFI 2507cc · 00→01 BPZ8HS-10 1.0 mm 150 HP 150 · Work BU8H 175 HP 175 · (Excl. Magnum, Ski) · EFI · 00→ BPZ8HS-10 1.0 mm 175 HP 175 · Magnum, Ski · EFI · 89→99 BU8H 175 HP 175 · Magnum, Ski · EFI · 00→ BPR7HS-10 BPR7HIX 1.0 mm 175 HP 175 · V175 · 78→98 BU8H 200 HP 200 · (Excl. OptiMax) · DFI · 97→ PZFR6H 1.0 mm 200 HP 200 · Magnum, Super Magnum · EFI · 79→99 BU8H 200 HP 200 · Incl. Super Magnum · EFI · 00→ BPZ8HS-10 1.0 mm 200 HP 200 · OptiMax · 97→04 PZFR5F-11 ZFR5FIX-11 1.0 mm 220 HP 220 · Magnum, V220 · EFI · 87→88 BU8H 225 HP 225 · Marathon · 94→01 BR8HS BR8HIX 1.0 mm 225 HP 225 · OptiMax · 98→04 PZFR5F-11 ZFR5FIX-11 1.0 mm 225 HP 225 · Super Magnum · EFI 3032cc · 97→ BU8H 240 HP 240 · Carb. · 95→ BU8H 250 HP 250 · 89→90 BU8H 250 HP 250 · Magnum · 2-Stroke EFI · 96→01 BR8HS BR8HIX 0.9 mm 260 HP 260 · EFI · 95→98 BU8H 265 HP 265 · EFI · 97→ BU8H 275 HP 275 · 91→94 BU8H 300 HP 300 · Super Magnum · EFI · 97→98 BZ7HS-10 0.8 mm Parts for these engines: [Mariner parts](/collections/quicksilver-marine-parts-oils-service-kits-engine-components). ### Force 19 applications Model Engine / details NGK plug Iridium upgrade Gap 3 HP 3 · 90→94 BP6HS-10 BPR6HIX 1.0 mm 4 HP 4 · 84→87 B6HS BR6HIX 0.8 mm 5 HP 5 · 88→93 BP6HS BPR6HIX 0.8 mm 5 HP 5 · 94→99 BP6HS BPR6HIX 0.9 mm 7.5 HP 7.5 · 85→ B6HS BR6HIX 0.8 mm 9.9 HP 9.9 · 84→93 BP6HS BPR6HIX 0.8 mm 9.9 HP 9.9 · 94→99 BP6HS BPR6HIX 0.9 mm 15 HP 15 · 84→93 BP7HS BPR7HIX 0.8 mm 15 HP 15 · 94→99 BP7HS BPR7HIX 0.9 mm 25 HP 25 · 89→91 BP6HS BPR6HIX 0.8 mm 25 HP 25 · 96→99 BP7HS BPR7HIX 0.9 mm 35 HP 35 · 86→91 B6HS-10 BR6HIX 1.0 mm 50 HP 50 · 84→87 B7HS BR7HIX 0.8 mm 50 HP 50 · Prestolite Ign. · 88→91 BUHX 85 HP 85 · 83→89 BUHX 90 HP 90 · Prestolite Ign. · 90→91 BUHX 120 HP 120 · Prestolite Ign. · 90→91 BUHX 125 HP 125 · 83→89 BUHX 150 HP 150 · Prestolite Ign. · 90→91 BUHX Parts for these engines: [Force parts](/collections/quicksilver-marine-parts-oils-service-kits-engine-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) - [Yamaha](/pages/ngk-spark-plugs-yamaha-outboards) - [Suzuki](/pages/ngk-spark-plugs-suzuki-outboards) - [Johnson](/pages/ngk-spark-plugs-johnson-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-mariner-force-outboards)