Suzuki OEM Spark Plugs

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Suzuki specifies a standard NGK spark plug for every DF outboard by NGK part number, and the number changes with the model year: the DF9.9B/15A/20A and DF25A/30A moved from CPR6EA-9 to MR6K-9, the DF115/140 B and BG models use LKR6E instead of the A models' BKR6E, and the supercharged DF350A uses an iridium ILZKR7D8. The chart below is taken from Suzuki's 2025 4-stroke maintenance manual.

Use only resistor-type plugs. Suzuki's schedule is to inspect the plugs at every 100 hours or 12 months and replace them when the electrodes or insulator are worn or damaged; there is no fixed replacement hour count in the owner's manuals. Seat the plug by hand, then tighten to the torque shown. Over-tightening damages the aluminum threads in the head.

Suzuki spark plug chart by model

Model (years) NGK plug Qty Gap Torque
DF2.5 (2006+) NGK CR6HSA 1 0.6–0.7 mm 11 N·m
DF4 / DF5 / DF6 (2002–2010) NGK BPR6ES 1 0.7–0.8 mm 28 N·m
DF4 / DF5 / DF6 (2011–2015), DF4A / DF5A / DF6A (2017+) NGK CPR6EA-9 1 0.8–0.9 mm 11 N·m
DF8A / DF9.9A (2010+) NGK CR6E 2 0.7–0.8 mm 11 N·m
DF9.9 / DF15 (2005–2010, carbureted) NGK BKR6E 2 0.7–0.8 mm 27 N·m
DF15 (2011–2012) NGK CPR6EA-9 2 0.8–0.9 mm 11 N·m
DF9.9B / DF15A / DF20A (2013–2017) NGK CPR6EA-9 2 0.8–0.9 mm 11 N·m
DF9.9B / DF15A / DF20A (2018+) NGK MR6K-9 2 0.8–0.9 mm 11 N·m
DF25 V-twin (2006–2014) NGK BKR6E 2 0.7–0.8 mm 28 N·m
DF25 / DF30 3-cyl. (2006–2010) NGK DCPR6E 3 0.8–0.9 mm 18 N·m
DF25A / DF30A (2015–2018) NGK CPR6EA-9 3 0.8–0.9 mm 11 N·m
DF25A / DF30A (2019+) NGK MR6K-9 3 0.8–0.9 mm 11 N·m
DF40 / DF50 (1999–2010) NGK DCPR6E 3 0.8–0.9 mm 18 N·m
DF40A / DF50A / DF60A / DF50AV / DF60AV (2010+) NGK DCPR6E 3 0.8–0.9 mm 17 N·m
DF60 / DF70 (1998–2009) NGK BPR6ES 4 0.7–0.8 mm 28 N·m
DF70A / DF80A / DF90A / DF100B (2009+) NGK DCPR6E 4 0.8–0.9 mm 18 N·m
DF90 / DF100 / DF115 / DF140 (2001–2012) NGK BKR6E 4 0.7–0.8 mm 28 N·m
DF100A / DF115A / DF140A (2013+) NGK BKR6E 4 0.7–0.8 mm 28 N·m
DF100C / DF115B / DF140B (2022+), DF115BG / DF140BG (2021+) NGK LKR6E 4 0.8–0.9 mm 17 N·m
DF150 / DF175 (2006+), DF150TG / DF175TG NGK BKR6E 4 0.7–0.8 mm 28 N·m (27 on TG)
DF150A / DF175A (2019+), DF150AP / DF175AP (2017+), DF200A / DF200AP (2015+) NGK LKR6E 4 0.8–0.9 mm 17 N·m
DF200 / DF225 / DF250 V6 (2004+), DF300 (2007–2011), DF250AP / DF300AP (2012+) NGK BKR6E 6 0.7–0.8 mm 28 N·m
DF300B / DF325A / DF350A (2018+) NGK ILZKR7D8 6 0.7–0.8 mm 17 N·m

Frequently asked questions

How often should Suzuki spark plugs be changed?

Suzuki's schedule is to inspect them every 100 hours or 12 months and replace them when worn or damaged. There is no fixed replacement hour count.

Should I check the gap on a new plug?

Yes, against the gap in the chart, before fitting.

Can I use a non-resistor plug?

No. Use only resistor-type plugs.

What about coils?

See Suzuki ignition coils and Suzuki electrical and ignition parts.

See spark plugs for all brands. Boat Max Online is an authorized Suzuki Marine dealer; the plugs we sell are genuine NGK through authorized distribution. Free shipping on orders over $149 to the lower 48 states.

Source: Suzuki 4-Stroke Outboard Maintenance Manual, Spark Plug Data (Feb 2025).
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