Which spark plug does a Suzuki outboard take? Suzuki changed plugs on several families over the years, so the model alone is not enough: the year matters. This chart was compiled by the Boat Max Online service team from Suzuki's own maintenance and owner's manuals. Gap and torque are Suzuki's published figures.
Suzuki outboard spark plug chart
| Models | Years | NGK plug | Qty | Gap | Torque |
|---|---|---|---|---|---|
| DF2.5 | 2006+ | NGK CR6HSA | 1 | 0.6–0.7 mm | 11 N·m |
| DF4A, DF5A, DF6A | 2017+ | NGK CPR6EA-9 | 1 | 0.8–0.9 mm | 11 N·m |
| DF4, DF5, DF6 | 2002–2016 | BPR6ES ('02–'10) / CPR6EA-9 ('11–'15) | 1 | 0.7–0.8 / 0.8–0.9 mm | — |
| DF8A, DF9.9A | 2010+ | NGK CR6E | 2 | 0.7–0.8 mm | 11 N·m |
| DF9.9B, DF15A, DF20A | 2013+ | NGK CPR6EA-9 ('13–'17) / NGK MR6K-9 ('18+) | 2 | 0.8–0.9 mm | 11 N·m |
| DF25A, DF30A | 2015+ | NGK CPR6EA-9 ('15–'18) / NGK MR6K-9 ('19+) | 3 | 0.8–0.9 mm | 11 N·m |
| DF40A, DF50A, DF60A, DF50AV, DF60AV | 2010+ | NGK DCPR6E | 3 | 0.8–0.9 mm | 17 N·m |
| DF70A, DF75A, DF80A, DF90A, DF100B | 2009+ | NGK DCPR6E | 4 | 0.8–0.9 mm | 18 N·m |
| DF100A, DF115A, DF140A | 2013+ | NGK BKR6E | 4 | 0.7–0.8 mm | 28 N·m |
| DF100C, DF115B, DF140B, DF115BG, DF140BG | BG 2021+, B 2022+ | NGK LKR6E | 4 | 0.8–0.9 mm | 17 N·m |
| DF150A, DF175A, DF200A, DF150AP, DF175AP, DF200AP | A 2019+ (DF200A 2015+), AP 2015+ | NGK LKR6E | 4 | 0.8–0.9 mm | 17 N·m |
| DF150, DF175, DF150TG, DF175TG | 2006–2018 | NGK BKR6E | 4 | 0.7–0.8 mm | 28 (DF150/175) / 27 (DF150TG/175TG) N·m |
| DF200, DF225, DF250 | 2004+ | NGK BKR6E | 6 | 0.7–0.8 mm | 28 N·m |
| DF250AP, DF300AP, DF250S, DF300 | DF300 2007–2011; DF300AP 2012+; DF250AP 2013+ | NGK BKR6E | 6 | 0.7–0.8 mm | 28 N·m |
| DF300B, DF325A, DF350A, DF300BMD, DF350AMD | 2018+ | NGK ILZKR7D8 | 6 | 0.7–0.8 mm | 17 N·m |
Notes that matter
- Where two plugs are listed with year ranges, the change is a real one: the DF9.9B/15A/20A moved from CPR6EA-9 to MR6K-9 in 2018 and the DF25A/30A did the same in 2019. Fit the plug for your year.
- The DF100C/115B/140B, the BG models and the DF150A–200A take the LKR6E, not the BKR6E used on the older DF100A/115A/140A and DF150/175. They are not interchangeable.
- Suzuki's EFI engines need resistor plugs (the R in the code). A non-resistor plug can upset the ignition and show up as rough idle and misfires.
- Suzuki inspects the plugs at every 100 hours or 12 months and replaces them when the electrodes are worn, fouled or the gap is out of range. Torque figures assume a clean, dry thread.
- Reading the old plug: light tan or grey is normal; sooty black means rich running or oil; white or blistered means lean or hot, and needs a cause found before the new plug goes in.
Buy the right plug
Our Suzuki NGK spark plug listing is organized by model and year so you get the plug on this chart, or browse the Suzuki spark plug collection. The 300-hour Suzuki maintenance kits are listed on the same page.
Sources: Suzuki 4-Stroke Outboard Maintenance Manual (Feb 2025); Suzuki owner's manuals for each model family (in our service library). Figures are Suzuki's published values; always confirm against the owner's manual for your model and year.