Suzuki · Outboard

Suzuki DF4A / DF5A / DF6A

The DF4A, DF5A and DF6A are one engine in three ratings (2.9, 3.7 and 4.4 kW): a 138 cc single-cylinder OHV four-stroke with carburettor, recoil start and tiller, built by Thai Suzuki since 2016 and weighing 24 kg with the short shaft. Its 1.0 litre tank sits above the carburettor and feeds it by gravity, the pressure lubrication runs through a small cartridge oil filter, and the motor can lie on its port side, starboard side or front without leaking. Because the three share every wear part, the filters, water pump kit, anodes and propellers on this page fit all of them; they are common on tenders and as auxiliaries on small sailing boats. The predecessor DF4, DF5 and DF6 (2002–2015) also has 138 cc but is a different engine without an oil filter; where its parts differ, the notes say so.

Manuals & documents

The links go to Suzuki’s own documents — some as archived copies of pages the maker has since taken down. We host no manuals or drawings.

Wear parts & part numbers

PartOEM numberAlso fitsNote
Service kit17400-918911,2,3,4—Suzuki’s kit for the 100 h or annual service of all three models from model year 2017: water pump repair kit, pump case upper panel 17412-91JL0 and sleeve 17413-91JL0, oil filter, fuel filter, CPR6EA-9 plug, both anodes, oil drain washer, two gear plug gaskets, an O-ring and a cotter pin. Suzuki’s global 2026 kit list gives 16500-97L00 for the same models, without panel and sleeve. The older DF4/DF6 took 17400-91860 (2002–2010) and 17400-91830 (2011–2016).
Water pump repair kit17400-986L21,3,2replaces 17400-98661—Repair kit for the water pump in the gear case; Suzuki’s catalogues do not list the impeller on its own. Suzuki USA gives the same number for the older DF4/DF6 from 2002, so both generations take it. Suzuki New Zealand’s 2025 catalogue still prints the earlier 17400-98661.
Spark plug09482-00L041,3,5NGK CPR6EA-95,3Gap 0.8–0.9 mm; one is in the maintenance kit. Also right for the older DF4/DF6 from 2011; engines from 2003–2010 take NGK BPR6ES (Suzuki 09482-00299).
Engine oil filter16510-16H111,3,2,6—Small cartridge filter, new with the A models; the older DF4/DF5/DF6 has none. The manual has it changed (dealer job) after the first 20 h, then every 200 h or yearly.
Fuel filter (engine)44330-13H001,3,2—Filter under the engine cover; also in the maintenance kit. The older DF4/DF6 (2002–2016) uses 15410-98500.
Drain plug gasket09168-120171,3—Washer 12 × 17 × 1 mm for the engine oil drain plug 09248-12009; fit a new one at every oil change. The older DF4/DF6 has drain plug 09248-10008 with washer 09168-10022.
Gear oil plug gaskets59178-97J001,2,3—Two per gear oil change, for the drain and the level screw; both are in the maintenance kit.
Anode (engine)55321-87J013,2,1—Aluminium anode that Suzuki lists from the DF2.5 to the DF350A; for fresh water only there is a magnesium version, 55321-87J11. One is in the maintenance kit.
Anode (engine)55321-95J002,3,1,7—Second aluminium anode, which Suzuki lists only for the DF2.5 and the DF4A–DF6A; the maintenance kit holds one of each.
Thermostat17670-91J028—50 °C thermostat. One source: a dealer lists it for the DF2.5 to DF20A, naming the DF4A, DF6A and the older DF4, DF5 and DF6; Suzuki’s maintenance catalogues do not show it.
Gear oil99000-22B48-0009,5,1—Suzuki ECSTAR outboard gear oil SAE 90 in a 400 ml tube with nozzle, enough for a change of about 190 ml. Suzuki USA sells its gear oil as 990A0-01E81-01Q (1 US quart). Any hypoid gear oil SAE 90, API GL-5 meets the manual.
Propeller58110-91JL0-01910,2,1—3-blade aluminium, 7-1/2 × 6 in, the lowest pitch, for heavy loads; Suzuki New Zealand lists it for the DF4A. Which pitch comes fitted from the factory differs by market. Also fits the older DF4/DF6 from 2004.
Propeller58110-91JM0-01910,2,1,11—3-blade aluminium, 7-1/2 × 6-1/2 in; Suzuki New Zealand lists it for the DF5A, Suzuki USA’s 2019 sheet for the DF4A. Also fits the older DF4/DF6 from 2004.
Propeller58110-91JN0-01910,2,1,11—3-blade aluminium, 7-1/2 × 7 in, the highest pitch; Suzuki New Zealand and Suzuki USA’s 2019 sheet list it for the DF6A. Also fits the older DF4/DF6 from 2004.
Propeller nut58130-91JL010,2,1—The same nut on the DF4A/5A/6A and on the older DF4/DF6.
Propeller hardware kit57635-97L00 · 58120-91JL0 · 09204-0300310,2,1—Single parts, not a kit: stopper (thrust piece) 57635-97L00, press-in propeller bushing 58120-91JL0 and the cotter pin 09204-03003 for the nut. Fit a new cotter pin every time the propeller comes off; one is in the maintenance kit. The older DF4/DF6 has the same bushing from 2004 but stopper 57635-91JL0.
Battery charging kit32000-97L101,2—Optional 12 V 5 A battery charging for the A models; it consists of the rectifier/regulator set 32801-97L01 and the receptacle kit 39600-97L10.
Flushing attachment55181-952001,2,12—Flushing attachment for the cooling system; fits the DF4A/DF5A/DF6A per Suzuki's catalogues.
Water pump plate17412-91JL01,2—Water pump case upper panel; renew with the impeller when worn.
Water pump liner (sleeve)17413-91JL01,2—Water pump case sleeve (liner) the impeller runs in; renew when scored.

Numbers checked against the sources below on 12 October 2026. Always confirm against your serial number and exact type before ordering.

Service intervals

TaskInterval
First serviceAfter the first 20 h or 1 month: change engine oil and gear oil; oil filter change and valve clearance check by the dealer; check fuel filter, anodes, carburettor (dealer), propeller, nut and pin, and grease all points5
Engine oil changeEvery 100 h or every 6 months, first time after 20 h5
Oil filterFirst at 20 h, then every 200 h or yearly (dealer job in the manual)5
Gear oil changeEvery 100 h or every 6 months, first time after 20 h5
Spark plugCheck and clean every 100 h or 6 months and before laying up; gap 0.8–0.9 mm5
Fuel filterCheck at 20 h, then every 100 h or 6 months and before laying up; replace every 400 h or 2 years5
Raw water impellerCheck every 200 h or yearly and before laying up (dealer); Suzuki USA’s quick reference says replace every 300 h or 3 years5,12
ThermostatCheck every 200 h or yearly and before laying up (dealer)5
Valve clearanceCheck at 20 h, then every 200 h or yearly (dealer)5
CarburettorCheck at 20 h, then every 100 h or 6 months and before laying up (dealer)5
AnodeOuter anodes: check at 20 h, then every 100 h or 6 months and before laying up; replace once worn down to about two thirds of their size. The dealer checks the anode inside the powerhead every 100 h or 6 months5
LubricationGrease at 20 h, then every 100 h or 6 months and before laying up, with Suzuki water-resistant grease: clamp screws, steering and swivel brackets, shift lever, choke, throttle cable, propeller shaft5
PropellerCheck propeller, nut and cotter pin at 20 h, then every 100 h or 6 months and before laying up; retighten the nut5
WinterisingBefore laying up: check spark plug, fuel filter, anodes and propeller, have water pump, thermostat and carburettor checked (dealer), and grease all points5
Full serviceFit Suzuki’s maintenance kit every 100 h or yearly (Suzuki’s kit list)3,2

Hours or months, whichever comes first, from Suzuki’s Japanese owner’s manual for the DF5A and DF6A (99011-97L80-000, August 2023); the DF4A is the same engine with a lower rating. That manual sets 6 months for engine oil, gear oil and most checks, while Suzuki USA’s portable quick reference, Suzuki’s global oil guide and its maintenance-kit list say 100 h or 12 months. Jobs marked “dealer” are workshop jobs in the manual.

Specifications

TypeSingle-cylinder four-stroke, OHV; carburettor with manual choke; digital CDI ignition; recoil start; tiller steering13
Displacement138 cc5,13
Bore × stroke60.4 × 48 mm5,13,11
PowerDF6A 4.4 kW (6 hp) at 5250 rpm; DF5A 3.7 kW (5 hp) at 5000 rpm; DF4A 2.9 kW (4 hp) at 4500 rpm5,13,11
Full-throttle rangeDF6A 4750–5750 rpm, DF5A 4500–5500 rpm, DF4A 4000–5000 rpm; the rev limiter cuts in at 5850 rpm on the DF6A and 5600 rpm on the DF5A5,13
Idle speedTrolling speed 1150–1250 rpm5
CoolingRaw-water cooled: rubber-impeller pump in the gear case, thermostat5
Engine oil capacity0.7 l, with or without a filter change1,12,5
Engine oil gradeFour-stroke oil API SG or higher, SAE 10W-40 or 10W-30, SAE 5W-30 below −5 °C; Suzuki recommends its ECSTAR oil5
Gear oil capacityapprox. 190 ml5,12,1
Gear oil gradeSuzuki outboard gear oil (ECSTAR) or hypoid gear oil SAE 90, API GL-55,12
Spark plugNGK CPR6EA-95,1
Spark plug gap0.8–0.9 mm5
FuelUnleaded petrol; Suzuki USA specifies 87 octane (AKI) with at most 10 % ethanol and no E1512,5
Fuel tank1.0 l built-in tank above the carburettor; optional 12 l portable tank12,13,5
Shaft lengthS 15 in (381 mm), L 20 in (508 mm)13
Dry weight24 kg (S) / 25 kg (L), without propeller and oil13
GearboxF-N-R, 1.92:1 (12:23); exhaust above the propeller; rubber hub in the propeller11,13
AlternatorNone as standard; optional 12 V 5 A charging kit 32000-97L1013,11,1
DimensionsL × W × H 533 × 292 × 1086 mm (S), 1213 mm high with the L shaft5
TiltManual; on the way up the shallow-water drive locks in three positions13
VersionsS = 15 in shaft, L = 20 in shaft, e.g. DF6AS, DF6AL; all with tiller and recoil start. DF4A, DF5A and DF6A share the engine and differ in rated output and rev range13,5
Years builtSince 2016 (Thai Suzuki, the DF6A first from February 2016; in the US from model year 2017), still in production14,1
PredecessorSuzuki DF4, DF5 and DF6, 2002–2015 (US up to model year 2016): also 138 cc, but a different engine with another bore and stroke, a larger built-in tank and no oil filter; the parts notes say which parts it shares15,1

Good to know

  • New motors leave the factory without engine oil: fill 0.7 l before the first start. To read the level, rest the dipstick in the filler neck without screwing it in.12,5
  • The A models have a small cartridge oil filter (16510-16H11) that the older DF4/DF5/DF6 lacks. It is due after the first 20 hours and then every 200 hours or yearly, so order it with the oil and a new drain washer (09168-12017).1,5
  • Lay the motor down only on its port side, starboard side or front: those are the three positions Suzuki designed it for, without fuel or oil leaking.13
  • If the drained gear oil looks milky, water is getting into the gear case: have the seals checked before you use the motor again. Refill from the lower hole until oil runs out of the upper one, about 190 ml, and fit new gaskets (59178-97J00) on both screws.5,12
  • After salt water, flush the motor: stand it in a tub with the water about 13 cm (5 in) above the anti-ventilation plate and let it idle in neutral for 5 minutes, or fit Suzuki’s flushing attachment 55181-95200 and run a garden hose through it for 5 minutes with the engine switched off.12,2,1
  • Replace the anodes once they have worn to about two thirds of their original size, and never paint them. The propeller nut needs a new cotter pin (09204-03003) every time the propeller comes off.5,10

Videos & how-tos

Links to YouTube, nothing embedded. The maker’s own channel comes first; the rest are channels we found clear and correct for this model.

On the marketplace

Looking for a part for the Suzuki DF4A / DF5A / DF6A? Post a wanted ad in the app — it is free, it sits on the live map, and boaters nearby who have the part aboard can answer.

Got spares you no longer need? List them in a minute. No commission, ever.

Get the app

Sources

  1. assets.suzukimarine.com/wp-content/uploads/2026/10/02165300/Suzuki-PARTS-Catalog-SEP30202…
  2. suzukimarine.co.nz/images/assets/10883/1/2025_suzuki_genuine_marine_p_and_a_general_1.pdf
  3. globalsuzuki.com/marine/SuzukiUltimateRiggingSelector/2026/pdf/MAINTENANCE%20KITS_2026.pdf
  4. onlineoutboards.com/products/suzuki-marine-maintenance-kit-df4-6-2017-and-newer
  5. suzukimarine.co.jp/boat/download/df5a_df6a.pdf
  6. wakeboss.com/products/filter-eng-oil
  7. globalsuzuki.com/marine/SuzukiUltimateRiggingSelector/2026/data/parts.json
  8. wakeboss.com/products/suzuki-17670-91j02-thermostat
  9. globalsuzuki.com/marine/SuzukiUltimateRiggingSelector/2026/pdf/OIL%26CHEMICALS_General_20…
  10. globalsuzuki.com/marine/SuzukiUltimateRiggingSelector/2026/pdf/PROPELLERS_2026.pdf
  11. assets.suzukimarine.com/wp-content/uploads/2022/06/21100606/2019-DF2.5-4A-6A-PIB.pdf
  12. assets.suzukimarine.com/wp-content/uploads/2026/08/03131308/Portables-Setup-Guide-WEB-FIN…
  13. globalsuzuki.com/marine/lineup/df6a-5a-4a/
  14. globalsuzuki.com/globalnews/2016/0125.html
  15. web.archive.org/web/20030627223245/http://www.suzukimarine.com:80/brochures/images/bro/df…

Suzuki is a trademark of its owner; boatparts.app is not affiliated with it. Part numbers are quoted for identification only. Spotted an error? Write to mail@boatparts.app.