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Honda BF90 Parts

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🔎 Honda BF90 Resource Center — Browse exploded parts diagrams (36 diagrams), specifications, and maintenance tips below. Scroll down to shop replacement parts for your Honda BF90.

The Honda BF90 is a powerful 90-horsepower four-stroke outboard that sits at the top of Honda's mid-range lineup, delivering outstanding performance for bay boats, deck boats, pontoons, and center consoles in the 18- to 23-foot class. Built on Honda's proven inline four-cylinder SOHC platform, the BF90 features programmed fuel injection, BLAST acceleration technology, and a lean burn control system that optimizes fuel economy at cruising speeds. This engine has earned a loyal following among both recreational boaters and commercial operators who value smooth, quiet power delivery combined with low maintenance costs. Honda's corrosion-resistant design and double-sealed electrical connectors make the BF90 particularly well-suited for saltwater environments. Keeping your Honda BF90 in top condition requires access to the right OEM replacement parts, and that is where womarine.com comes in. Our extensive catalog of aftermarket marine parts is paired with detailed exploded parts diagrams, allowing you to identify and order every component from gaskets to gears with pinpoint accuracy. Whether you are a seasoned mechanic or just getting started with DIY boat engine repair, our parts listings are organized for fast, frustration-free ordering.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke SOHC, 4-Cylinder
Displacement 1496 cc (91.3 cu in)
Bore x Stroke 73 mm x 89.4 mm
Spark Plug (Type & Gap) NGK IMR9C-9HES / Gap: 0.8-0.9 mm
Engine Oil Capacity 4.5 L (4.8 US qt)
Recommended Engine Oil SAE 10W-30 (API SJ or higher)
Gear Case Oil Capacity 680 mL (23.0 US fl oz)
Idle Speed (in gear) 800 ± 50 RPM
Full Throttle RPM Range 5000-6000 RPM
Fuel Unleaded Gasoline (87 Octane or higher)

Always verify specifications against your owner's manual for your specific serial number range.

Common Issues & Recommended Parts

The Honda BF90 is engineered for durability, but proactive maintenance and timely parts replacement are key to avoiding costly breakdowns on the water. Below are the issues most frequently reported by BF90 owners.

  • Intermittent Stalling or Surging: Dirty fuel injectors or a failing idle air control valve (IACV) can cause erratic idle behavior. → Recommended: Fuel Injector Set & IACV Assembly
  • Overheating Alert: A worn water pump impeller is the most common cause. Salt crystal buildup in the cooling passages can also restrict flow. → Recommended: Water Pump Impeller Kit & Thermostat
  • Oil Pressure Warning: Low oil level or a failing oil pressure switch can trigger the alarm. Always verify oil level first before replacing sensors. → Recommended: Oil Pressure Switch & Oil Filter
  • Lower Unit Vibration: A bent propeller shaft or damaged propeller creates noticeable vibration at speed. → Recommended: Propeller & Propeller Shaft Seal Kit
  • Trim System Slow Response: Low trim fluid or a worn trim pump motor results in sluggish tilt operation, especially in cold weather. → Recommended: Trim Motor Assembly & Trim Fluid

Parts Diagrams & OEM Part Numbers

Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Honda BF90.

ALTERNATOR (9 parts) ALTERNATOR
Ref OEM Part # Part Name
5 31631-ZW1-L01 ROTOR
7 31633-ZW1-003 CLAMP, WIRE
8 31634-ZW1-003 CLAMP, CABLE
10 90004-ZW1-003 SCREW-WASHER (5X12)
11 90005-ZW1-003 SCREW-WASHER (4X8)
12 90007-ZW1-003 SCREW-WASHER (6X30)
14 90125-ZV1-010 BOLT, FLANGE (6X42)
15 94301-08100 PIN, DOWEL (8X10)
16 95701-06018-02 BOLT, FLANGE (6X18)
C.D.I. UNIT COVER (3 parts) C.D.I. UNIT COVER
Ref OEM Part # Part Name
2 90121-ZV0-010 BOLT, FLANGE (6X25)
3 90672-SA0-003 STRAP, CABLE (118MM) (BLACK)
4 94103-06200 WASHER, PLAIN (6MM)
CAMSHAFT/VALVE (16 parts) CAMSHAFT/VALVE
Ref OEM Part # Part Name
1 12209-KL4-005 SEAL, VALVE STEM (NOK)
2 12209-MB9-003 SEAL, VALVE STEM (NOK)
4 14620-ZW1-000 ARM ASSY., IN. ROCKER
5 14625-ZW1-000 ARM, EX. ROCKER
7 14636-ZW1-000 COLLAR, ROCKER
12 14744-PT0-004 SCREW, TAPPET ADJUSTING
14 14752-ZW1-000 SPRING, EX. VALVE (INNER)
15 14753-ZW1-000 SPRING, EX. VALVE (OUTER)
16 14765-P08-000 RETAINER, VALVE SPRING
17 14771-410-010 RETAINER, VALVE SPRING
18 14775-ME9-000 SEAT, VALVE SPRING
19 14775-P08-000 SEAT, VALVE SPRING
20 14781-MB9-000 COTTER, VALVE
21 14781-PJ7-003 COTTER, VALVE (FUJI VALVE)
22 90206-ML7-000 NUT, TAPPET ADJUSTING
23 91212-ZW1-005 OIL SEAL (31X46X7)
CARBURETOR (26 parts) CARBURETOR
Ref OEM Part # Part Name
1 12155-ZV5-010 METAL, ANODE
3 16011-ZV4-005 VALVE SET, FLOAT
4 16013-ZW4-H01 FLOAT SET
5 16016-ZW1-L41 SCREW SET
7 16024-ZY3-000 SCREW SET, DRAIN
8 16028-ZV3-000 SCREW SET
9 16029-ZV3-000 SCREW SET
10 16052-KG4-003 SPRING, COMPRESSION COIL
11 16071-ZV4-005 SCREW, PLUG
12 16081-ZV4-650 SCREW-WASHER
18 16150-ZW1-000 JET SET (#40)
20 16166-ZW1-000 NOZZLE, MAIN
21 16211-ZW1-000 INSULATOR, CARBURETOR
25 17202-ZV5-310 COLLAR, DISTANCE (6.5X11X7.5)
27 17384-ZW1-000 GASKET, MUFFLER PLATE
28 90021-ZW1-000 BOLT, FLANGE (6X106)
29 90403-ZW1-000 WASHER, PLAIN (6MM)
31 90603-ZV4-000 CLIP, TUBE (B10)
32 93500-05010-0B SCREW, PAN (5X10)
33 93500-06018-4J SCREW, PAN (6X18)
34 95001-55003-60M BULK HOSE, FUEL (5.5X3000) (5.3X175)
35 95003-05008-60M BULK HOSE, VINYL (3.5X6.5X8000) (3.5X6.5X290)
37 95701-06020-02 BOLT, FLANGE (6X20)
38 96220-60150 ROLLER (6X15)
39 99101-ZV5-1320 JET, MAIN (#132)
40 99103-MA1-0520 JET, SLOW (#52)
CONTROL PANEL/LIGHT SWITCH KIT (5 parts) CONTROL PANEL/LIGHT   SWITCH KIT
Ref OEM Part # Part Name
2 06352-ZZ5-M00 SWITCH KIT, LIGHT
17 93500-05040-1B SCREW, PAN (5X40)
18 94050-05020 NUT, FLANGE (5MM)
19 94103-05200 WASHER, PLAIN (5MM)
20 94111-05400 WASHER, SPRING (5MM)
CRANKSHAFT/PISTON (6 parts) CRANKSHAFT/PISTON
Ref OEM Part # Part Name
1 13010-ZW1-000 RING SET, PISTON (STD)
4 13204-PE1-003 BOLT, CONNECTING ROD
5 13205-634-010 NUT, CONNECTING ROD
7 13217-PLM-A01 BEARING G, CONNECTING ROD (RED) (DAIDO)
10 13331-PG6-004 WASHER, THRUST (TAIHO)
13 91214-PL2-003 OIL SEAL (98X80X10) (NOK)
CYLINDER BLOCK (25 parts) CYLINDER BLOCK
Ref OEM Part # Part Name
1 12000-ZW1-L00ZA BLOCK ASSY., CYLINDER *NH8* (DARK GRAY)
2 12155-ZV5-010 METAL, ANODE
3 15142-PH3-003 O-RING (10.8X2.4) (ARAI)
5 15400-PLM-A02PE FILTER, OIL (SOLD INDIVIDUALLY)
6 15611-921-000 CAP, OIL (YELLOW)
7 15631-ZW1-000 EXTENSION, OIL FILLER
8 15635-ZG3-800 GASKET, EXTENSION OIL FILLER (NON-ASBESTOS)
9 32119-ZW1-010 BRACKET, HARNESS CLIP
10 32743-PJ7-010 CLAMP C, ENGINE WIRE HARNESS
11 37240-ZG3-E01 SWITCH, OIL PRESSURE
12 90001-ZW1-000 BOLT, STUD (10X125)
13 90002-ZG5-004 SCREW-WASHER (4X8)
15 90012-ZZ5-M02 BOLT, TIMING BELT ADJUSTING SPRING
16 90011-ZW9-000 BOLT, FLANGE (6X14) (CT200)
17 90015-PH1-013 HOLDER, OIL FILTER
18 90702-PE0-000 PIN, DOWEL (12X18)
19 90703-PE0-000 PIN, DOWEL (18X22)
20 91212-ZW1-L01 OIL SEAL (38X50X8)
21 91301-805-000 O-RING (26X2.7)
22 91558-SD5-003 CLIP, WIRE HARNESS (BLACK)
23 93500-06018-4J SCREW, PAN (6X18)
24 95701-06022-02 BOLT, FLANGE (6X22)
25 95701-08035-02 BOLT, FLANGE (8X35)
26 95701-08040-02 BOLT, FLANGE (8X40)
27 95701-08050-02 BOLT, FLANGE (8X50)
CYLINDER HEAD (26 parts) CYLINDER HEAD
Ref OEM Part # Part Name
1 12204-ZW1-305 GUIDE, VALVE (OVER SIZE)
4 12217-ZY9-M01 BOLT, SEALING (20MM)
7 12251-ZW1-014 GASKET, CYLINDER HEAD
9 12314-ZV5-300 COLLAR, HEAD COVER
10 12391-ZW1-010 GASKET, HEAD COVER
11 16700-ZW1-004 PUMP ASSY., FUEL (MSDS)
12 16717-ZW1-000 LIFTER, FUEL PUMP
15 17195-MN5-000 T-JOINT
16 19416-ZW1-000 CLAMP, HOSE
19 35670-ZW1-013 SWITCH ASSY., THERMOSTAT
20 90005-PM3-003 BOLT-WASHER (10X140) (SAGA)
21 90006-ZW1-000 BOLT, STUD (8X22)
22 90008-PZ1-003 BOLT-WASHER (10X120.5) (SAGA)
23 90013-ZV0-010 BOLT, FLANGE (6X12)
24 90602-ZV5-013 CLAMP, TUBE (D22)
25 90603-ZV4-000 CLIP, TUBE (B10)
26 90604-ZV0-000 CLIP, TUBE (B12)
29 94109-20000 WASHER, DRAIN PLUG (20MM)
30 94301-08140 PIN, DOWEL (8X14)
31 94301-12160 PIN A, DOWEL (12X16)
32 95001-75008-60M BULK HOSE, FUEL (7.5X8000) (7.3X55)
33 95701-06012-00 BOLT, FLANGE (6X12)
34 95701-06035-02 BOLT, FLANGE (6X35)
35 95701-08040-02 BOLT, FLANGE (8X40)
36 95801-06080-09 BOLT, FLANGE (6X80)
37 96001-06020-02 BOLT, FLANGE (6X20)
CYLINDER HEAD ASSEMBLY (0 parts)
ENGINE COVER/LOWER CASE (37 parts) ENGINE COVER/LOWER CASE
Ref OEM Part # Part Name
2 16900-SA5-004 FILTER, FUEL (TOYO ROKI)
4 17710-ZW9-033 CONNECTOR ASSY., FUEL (B)
5 17877-ZW1-000 PLATE, REMOTE CONTROL CABLE
7 17936-921-000 WASHER, PIVOT
11 24626-ZV5-010 PLATE, SHIFT SHAFT
12 30564-ZE8-003 CLAMP, IGNITION WIRE
18 35645-ZW1-000 STAY, POWER TILT SWITCH
22 40106-ZV5-000 GROMMET, CASE (LOWER) (B)
23 40114-ZV5-821 GROMMET, CASE (LOWER)
27 51640-121-730 RUBBER, FR. CARRIER CUSHION
30 63102-ZW1-300 SEAL, ENGINE COVER
33 63108-ZW1-000 DAMPER, HOOK
34 63201-ZW1-000ZA LEVER, COVER LOCK *NH282MU* (OYSTER SILVER METALLIC-U)
35 63202-ZW1-000 HOOK, COVER LOCK
36 63205-920-000 BUSH, COVER LOCK
37 82873-ZV5-000 GROMMET, WATER CHECK
38 82873-ZW1-010 GROMMET, WATER CHECK
39 90013-ZV0-010 BOLT, FLANGE (6X12)
40 90013-ZV4-010 BOLT, FLANGE (6X20)
41 90015-ZV0-000 BOLT, FLANGE (6X28) (CT200)
42 90019-ZV1-010 BOLT, FLANGE (5X10)
43 90113-ZV0-000 BOLT, HEX. (6X35)
44 90127-ZV4-000 BOLT, HEX. (6X16)
45 90301-473-003 NUT, U (6MM) (FUSE RASHI)
46 90505-ZV1-000 WASHER (14MM)
47 90506-ZV1-000 WASHER, WAVE (14MM)
48 90506-ZV4-000 WASHER, PLAIN (6MM)
49 90507-ZV4-000 WASHER, PLAIN (8MM)
50 90512-921-010 WASHER (6MM)
51 90603-ZV4-000 CLIP, TUBE (B10)
52 90604-ZV0-000 CLIP, TUBE (B12)
54 90652-HC4-003 CLAMP, HARNESS
55 90679-679-004 CLIP, CABLE
57 91504-ZY9-M03 COLLAR (8.5X14.5)
58 92101-08016-4J BOLT, HEX. (8X16)
59 94103-08200 WASHER, PLAIN (8MM)
60 95701-08035-02 BOLT, FLANGE (8X35)
FUEL TANK (16 parts) FUEL TANK
Ref OEM Part # Part Name
1 16900-ZV5-902 JOINT ASSY., FUEL
2 16977-ZV5-A00 FITTING, QUICK DISCONNECT
3 16979-ZV5-900 O-RING
4 17500-ZZ5-711 TANK ASSY., FUEL
5 17583-ZV5-901 FILTER, FUEL
8 17650-ZW9-023 CONNECTOR ASSY., FUEL (A)
9 17660-ZW9-003 CONNECTOR, FUEL
10 17661-921-010 BULB, PRIMER
11 17665-ZV5-000 VALVE, IN.
12 17680-ZV4-000 VALVE, OUTLET
13 17700-ZW9-030 TUBE ASSY., FUEL
14 17701-ZV5-000 TUBE, FUEL LONG (7.3X2000)
16 17703-921-000 BAND, TUBE CLIP (20MM)
17 17704-ZV4-010 BAND, TUBE CLIP (12.5MM)
18 04101-ZW9-010 CONNECTOR SET, FUEL TUBE
19 04104-ZW9-010 CONNECTOR SET, FUEL
GASKET KIT (0 parts)
GASKET KIT (SHORT BLOCK & HEAD ASSY.) (0 parts)
GEAR CASE/EXTENSION CASE (30 parts) GEAR CASE/EXTENSION CASE
Ref OEM Part # Part Name
1 17738-SP0-003 CLIP, FUEL PIPE (BLACK)
3 32161-KM3-003 BAND, WIRE
4 40201-ZW1-020ZA CASE, EXTENSION *NH282MU* (L) (OYSTER SILVER METALLIC-U)
5 40209-ZW1-000 RUBBER, DRAIN PLUG
7 40219-ZV5-003 WIRE, LEAD (1.2X116MM)
14 41171-ZV5-000 END, NIPPLE
15 41172-ZV5-000 NIPPLE, SENSOR
16 50111-ZW1-010ZA HOUSING, MOUNTING (LOWER) *NH282MU* (OYSTER SILVER METALLIC-U)
18 50156-ZW1-010 COLLAR, MOUNTING (LOWER)
19 50161-ZW1-020ZA HOUSING, CENTER MOUNTING (LOWER) *NH282MU* (OYSTER SILVER METALLIC-U)
20 63719-ZW5-000 SEAL B, COVER (LOWER)
22 63719-ZW1-000 GROMMET, COVER (LOWER)
26 90110-ZV5-000 SCREW, SPECIAL (6X35)
29 90118-ZY6-000 BOLT, HEX. (12X225)
30 90119-ZV5-000 SCREW, PAN (6X8)
32 90123-ZV5-010 BOLT, HEX. (10X40)
35 90308-ZW1-003 NUT, SELF-LOCK (12MM)
36 90311-ZV5-000 NUT, PLATE (5MM)
37 90401-ZW1-000 WASHER, PLAIN (8MM)
38 90452-GK4-600 WASHER, PLAIN (5MM)
40 90559-ZW1-000 WASHER, PLAIN (12MM)
41 90563-ZV5-000 WASHER, PLAIN (10MM)
42 90756-ZV5-000 PIN, DOWEL (6X10)
43 91563-ZV5-000 COLLAR, DISTANCE (6X10.5X25)
44 91568-ZV5-000 COLLAR, DISTANCE (5X7X38)
45 91569-ZV5-000 COLLAR, DISTANCE (5X7X23)
46 93500-05030-4J SCREW, PAN (5X30)
47 93500-05045-4J SCREW, PAN (5X45)
49 95005-50003-30M BULK HOSE, VACUUM (5X3000) (5X200)
50 95701-06012-02 BOLT, FLANGE (6X12)
HANDLEBAR (53 parts) HANDLEBAR
Ref OEM Part # Part Name
4 24592-ZW1-700 PLATE, SHIFT CABLE
5 24614-ZW1-700 LEVER, SHIFT (SOURCE: VINTAGE PARTS INC.)
7 24617-ZW1-700 PLATE, CLICK BASE
8 24618-ZV5-000 PIVOT, SHIFT
9 24619-ZW1-700 SPRING, CLICK
10 32161-404-000 BAND B1, WIRE
12 32748-PR3-000 STAY C, ENGINE WIRE HARNESS
13 32901-952-770 TIE, CABLE (2.4X92) (NATURAL)
15 35110-ZV5-003 KEY ASSY., COMBINATION SWITCH (35100-ZV5-003 ONLY)
18 35645-ZW1-000 STAY, POWER TILT SWITCH
19 36182-ZV4-651 WIRE, EMERGENCY
20 36187-ZV4-652 CLIP, EMERGENCY LOCK
21 37210-ZW1-702 LAMP ASSY., INDICATION (2-LED)
23 53104-ZV3-000 BOLT, FRICTION
27 53108-ZW1-700 BRACKET, THROTTLE REEL (A)
31 53114-ZW1-700 PLATE, REEL SETTING
32 53116-ZW1-700 BUSH, HANDLEBAR
35 53148-ZV3-000 SPRING, GRIP PIPE
36 53165-ZV4-000 RUBBER, GRIP
38 53236-ZW1-700 BLOCK, STEERING FRICTION
39 53238-ZW1-700 ROD, STEERING FRICTION
40 53239-ZW1-701 SHAFT, STEERING FRICTION
41 90105-881-000 BOLT, HEX. (6X12)
42 90109-ZV5-000 BOLT, STUD (10X28)
43 90115-881-000 BOLT, HEX. (8X32)
44 90123-ZV3-000 SCREW, PAN (5X12)
45 90127-ZV4-000 BOLT, HEX. (6X16)
47 90302-921-000 NUT, HEX. (16MM)
48 90305-ZV4-000 NUT, SELF-LOCK (8MM)
49 90306-ZV5-003 NUT, SELF-LOCK (10MM)
50 90308-ZV5-003 NUT, SELF-LOCK (12MM)
51 90401-ZW1-000 WASHER, PLAIN (8MM)
52 90504-921-010 WASHER, PLAIN (6MM)
53 90506-ZV1-000 WASHER, WAVE (14MM)
54 90514-ZV4-000 WASHER (10MM)
55 90543-ZV3-000 WASHER (10MM)
56 90552-ZV5-000 WASHER, PLAIN (12MM)
57 90559-ZV5-000 WASHER, PLAIN (12MM)
58 90602-SB0-003 CLIP (10.7MM)
59 90627-ZA8-E50 CLIP (7.5MM)
60 90672-SB2-003 STRAP, CABLE (105MM) (BLACK)
61 90759-ZV1-000 PIN, SPLIT (2.0)
62 90765-ZW1-000 PIN, LOCK SPECIAL (6MM)
63 90951-ZV7-010 NIPPLE, GREASE
65 91352-ZV5-000 O-RING (15.54X2.62)
66 91451-ZW1-701 TUBE, SPIRAL (9X110)
67 91475-SB6-000 CLIP, WIRE HARNESS (6.3MM)
68 91552-ZW1-700 COLLAR, DISTANCE (12.2X22X21.5)
69 93700-06016-4J SCREW, OVAL (6X16)
70 94002-06490-0S NUT, HEX. (6MM)
71 94305-30203 PIN, SPRING (3X20)
72 94305-40203 PIN, SPRING (4X20)
73 94305-40283 PIN, SPRING (4X28)
IGNITION COIL/C.D.I. UNIT (10 parts) IGNITION COIL/C.D.I. UNIT
Ref OEM Part # Part Name
3 30416-ZW1-000 CASE, IGNITION CONTROL MODULE (CDI)
6 30506-ML4-003 SUSPENSION, IGNITION COIL
11 32660-MJ6-710 CLAMP, WIRE
12 32763-PA0-000 CLAMP, WIRE
15 40102-ZV5-000 GROMMET, CASE (LOWER)
16 90682-ZV5-003 CLIP, WIRE HARNESS
17 91402-ZW1-003 CLIP, SWITCH CORD
18 91553-ZV5-010 COLLAR, MODULE IGNITION CONTROL CASE (CDI)
19 95701-06012-02 BOLT, FLANGE (6X12)
20 95701-06016-02 BOLT, FLANGE (6X16)
LABELS (6 parts) LABELS
Ref OEM Part # Part Name
5 87125-ZW1-700 MARK, STARTER (ENGLISH)
6 87131-ZW1-000 MARK, SIDE
8 87152-ZW1-740 LABEL, SPECIFICATION (NMMA)
11 87511-ZV1-C20 MARK, CHANGE (JAPANESE/ENGLISH)
14 87538-ZW1-740 LABEL, WARNING OPERATOR (ENGLISH)
15 87546-ZW1-740 MARK, EMERGENCY START (ENGLISH)
METER KIT (19 parts) METER KIT
Ref OEM Part # Part Name
1 06372-ZW5-U12 METER KIT, TRIM (B)
3 06374-ZW5-U10 METER KIT, VOLT (B)
4 06375-ZW5-U11 METER KIT, TACHO (B)
6 32550-ZW5-U00 HARNESS ASSY., METER (B)
7 34908-MB9-871 BULB, WEDGE BASE (T10) (12V 1.7W) (STANLEY)
8 34908-MG9-951 BULB, WEDGE BASE (12V 1.7W)
9 37215-KM1-670 CLAMP
10 37226-MZ5-008 BAND, SELF-LOCK
11 37263-ZV5-821 GASKET
12 37264-ZV5-821 GASKET
13 37266-ZV5-821 BRACKET
14 37305-KE5-008 SCREW-WASHER (3X22)
16 90309-ZV5-821 NUT, HEX. (5MM)
17 90310-ZV5-821 NUT, HEX. (4MM)
18 90550-ZV5-821 WASHER, SPRING (5MM)
19 90560-ZV5-821 WASHER, SPRING (4MM)
20 37258-ZV5-U01 SOCKET
21 37258-ZW5-U01 SOCKET
22 37202-ZW5-U01 TUBE, SPEED METER (4X7X8000)
MOUNT CASE/OIL PAN (18 parts) MOUNT CASE/OIL PAN
Ref OEM Part # Part Name
2 11381-ZW1-000 GASKET, OIL PAN
4 19252-ZW1-000 GROMMET, WATER TUBE
5 23172-ZW1-013 GASKET, MOUNT CASE
6 31110-ZW1-000ZA FLYWHEEL *TBLACK* (BLACK)
7 90002-ZW1-010 BOLT (12MM)
8 90009-ZV5-000 BOLT, HEX. (8X35)
9 90010-ZV5-000 BOLT, HEX. (8X55)
10 90010-ZW1-020 BOLT, HEX. (10X47)
11 90011-ZW1-010 BOLT, HEX. (10X110)
12 90012-ZW1-010 BOLT, HEX. (10X90)
13 90115-ZV5-000 BOLT, HEX. (8X25)
14 90131-ZV5-000 BOLT, DRAIN PLUG
15 90401-ZW1-000 WASHER, PLAIN (8MM)
16 90563-ZV5-000 WASHER, PLAIN (10MM)
17 90601-ZE2-000 WASHER, DRAIN PLUG (12MM)
19 94303-06100 PIN, DOWEL (6X10)
20 95701-06012-02 BOLT, FLANGE (6X12)
21 95701-10110-09 BOLT, FLANGE (10X110)
MUFFLER COVER (14 parts) MUFFLER COVER
Ref OEM Part # Part Name
2 17202-ZV4-310 COLLAR, DISTANCE
4 17393-ZW1-040 DUCT, MUFFLER (SOURCE: VINTAGE PARTS INC.)
5 17394-ZV5-000 GASKET, MUFFLER COVER
8 40102-ZV5-000 GROMMET, CASE (LOWER)
10 90121-ZV0-010 BOLT, FLANGE (6X25)
12 90403-ZW1-000 WASHER, PLAIN (6MM)
13 91553-ZV5-010 COLLAR, MODULE IGNITION CONTROL CASE (CDI)
14 94103-06200 WASHER, PLAIN (6MM)
15 95701-06025-02 BOLT, FLANGE (6X25)
17 17396-ZW1-000 JOINT, THREE WAY
18 90630-ZW1-003 CLIP, PURSE LOCK
19 95003-07008-60M BULK HOSE, VINYL (4X7X8000) (4X7X70)
20 95003-07008-60M BULK HOSE, VINYL (4X7X8000) (4X7X70)
21 95003-09001-60M BULK HOSE, VINYL (4.5X8X1000) (4.5X8X150)
OIL PUMP/EXHAUST PIPE (18 parts) OIL PUMP/EXHAUST PIPE
Ref OEM Part # Part Name
1 15100-ZW1-000 PUMP ASSY., OIL
5 15231-PE0-000 VALVE, RELIEF
6 15232-PG6-000 SPRING, RELIEF VALVE
7 15236-ZY9-M00 BOLT, SEALING (18MM)
8 15237-PY3-000 WASHER, SEALING (18MM)
9 15331-ZW1-000 ROTOR (INNER)
10 15341-ZW1-000 ROTOR (OUTER)
12 18333-ZW1-000 GASKET, EX. PIPE
13 90017-ZV0-000 BOLT, FLANGE (6X18)
14 90115-ZV5-000 BOLT, HEX. (8X25)
15 90401-ZW1-000 WASHER, PLAIN (8MM)
16 90456-MC7-000 WASHER, THRUST (13MM)
17 91301-ZW1-000 O-RING, OIL PUMP
18 91302-ZW1-000 O-RING, PUMP COVER
19 95701-08020-09 BOLT, FLANGE (8X20)
20 95701-08040-02 BOLT, FLANGE (8X40)
21 95701-08065-02 BOLT, FLANGE (8X65)
22 96220-50178 ROLLER (5X17.8)
POWER TRIM-TILT/DAMPER (44 parts) POWER TRIM-TILT/DAMPER
Ref OEM Part # Part Name
2 35701-MG9-950 BAND (BLACK 3.5X140)
3 36104-ZW1-003 TUBE, SPIRAL (12X14.6)
4 36120-ZW1-704 MOTOR ASSY., POWER TILT
5 36122-ZX2-023 BRACKET ASSY.
6 36123-ZW1-013 ARMATURE
7 36129-ZW1-023 YOKE ASSY.
8 40107-ZW1-700 GROMMET, CASE (LOWER) (C)
9 50214-ZV5-003 BUSH, SWIVEL CASE
10 56000-ZW1-713 TRIM-TILT ASSY., POWER
12 56110-ZW1-701 ROD, PISTON (B)
13 56113-ZW1-701 JOINT, DRIVE
14 04602-ZY3-000 GUIDE, ROD
15 56116-ZW1-701 FILTER B
16 56117-ZV5-821 RING, BACK-UP
17 56118-ZV5-820 BUSH, MOTOR CODE
18 56120-ZY9-013 ROD, PISTON
21 56180-ZW1-701 VALVE, RESERVOIR
22 56513-ZV5-000 BUSH, CYLINDER (LOWER)
23 56532-ZZ0-C00 PIN, CYLINDER (UPPER)
24 56851-ZW1-703 TANK, OIL
25 56860-ZW1-701 CAP, OIL TANK
26 90113-ZW1-702 BOLT, RECESSED
27 90114-ZW1-702 BOLT A, SOCKET
28 90115-ZW1-702 BOLT B, SOCKET
29 90116-ZW1-702 BOLT, HEX.
30 90127-ZV5-003 SCREW, RIVET (5X10)
31 90602-SB0-003 CLIP (10.7MM)
32 90652-ZW1-702 CIRCLIP (INNER)
33 91203-ZV5-821 OIL SEAL
34 91207-ZW1-013 O-RING (2.0X70.5)
35 91302-ZV5-821 O-RING (1.8X69.6)
36 91316-ZV5-821 O-RING (3.5X38.7)
37 91352-ZW1-702 O-RING (1.8X7.7)
38 91353-ZW1-703 O-RING (1.9X11)
39 91354-ZW1-701 O-RING (3.5X35.7)
40 91355-ZW1-701 O-RING (3.5X41.7)
41 91357-ZW1-701 O-RING SET (3.5X31.7)
42 91358-ZW1-701 SEAL, WATER
43 91361-ZW1-701 GASKET
44 91557-ZW1-701 COLLAR, ORIFICE
45 94540-15029 E-RING (15MM)
46 04605-ZW1-020 CYLINDER ASSY. KIT, POWER TRIM-TILT
47 40219-ZY3-023 WIRE, LEAD (1.5X116MM)
48 90119-ZV5-000 SCREW, PAN (6X8)
PROPELLER KIT (0 parts)
REGULATOR/STARTER CABLE (38 parts) REGULATOR/STARTER CABLE
Ref OEM Part # Part Name
1 31750-ZW1-003 RECTIFIER ASSY., REGULATOR (20A)
2 32121-HA0-003 BAND, WIRE
4 32161-404-000 BAND B1, WIRE
5 32410-ZW1-000 CABLE ASSY., STARTER
6 32411-ZW1-003 COVER, STARTER TERMINAL
7 32412-ZV4-811 COVER, MAGNETIC SWITCH TERMINAL
9 32540-ZV5-911 HARNESS ASSY., METER (A)
10 34908-MB9-871 BULB, WEDGE BASE (T10) (12V 1.7W) (STANLEY)
11 34908-MG9-951 BULB, WEDGE BASE (12V 1.7W)
12 37215-KM1-670 CLAMP
13 37250-ZV7-913 TACHOMETER ASSY.
14 37253-ZV5-821 GASKET
15 37256-ZV5-821 BRACKET
16 37258-ZV5-821 SOCKET
17 37260-ZV5-821 METER ASSY., TRIM
18 37263-ZV5-821 GASKET
19 37266-ZV5-821 BRACKET
20 37268-ZV5-821 SOCKET
22 38551-ZW1-000 GROMMET, RELAY
24 90013-ZV0-010 BOLT, FLANGE (6X12)
25 90011-ZW9-000 BOLT, FLANGE (6X14) (CT200)
26 90020-ZV5-000 BOLT, FLANGE (6X22)
27 90203-ZV5-000 NUT, HEX. (6MM)
28 90203-ZW1-000 NUT-WASHER (8MM)
29 90309-ZV5-821 NUT, HEX. (5MM)
30 90310-ZV5-821 NUT, HEX. (4MM)
31 90550-ZV5-821 WASHER, SPRING (5MM)
32 90560-ZV5-821 WASHER, SPRING (4MM)
33 90683-KJ2-003 CLIP, WIRE HARNESS
34 91553-ZV5-010 COLLAR, MODULE IGNITION CONTROL CASE (CDI)
35 94101-06200 WASHER, PLAIN (6MM)
36 95701-06014-02 BOLT, FLANGE (6X14)
37 95701-06025-02 BOLT, FLANGE (6X25)
38 98200-11000 FUSE A (10A)
39 98200-31500 FUSE, BLADE (15A)
40 98200-33000 FUSE, BLADE (30A)
41 38216-ZV5-003 COVER ASSY., FUSE (15A)
42 38216-ZW1-003 COVER ASSY., FUSE (30A)
REMOTE CONTROL BOX COVER /ENGINE COVER KIT (2 parts) REMOTE CONTROL BOX COVER /ENGINE COVER KIT
Ref OEM Part # Part Name
1 06881-ZW5-U01 COVER KIT, REMOTE CONTROL BOX (TOP MOUNT SINGLE)
2 06881-ZW5-U11 COVER KIT, REMOTE CONTROL BOX (TOP MOUNT DUAL)
SHIFT SHAFT (27 parts) SHIFT SHAFT
Ref OEM Part # Part Name
2 17931-ZW1-000 ARM, THROTTLE
3 24210-ZW1-010 SPRING, CLICK
4 24610-ZW1-901 SHAFT, SHIFT (A)
5 24612-ZW1-010 ARM, SHIFT
7 24618-ZV5-000 PIVOT, SHIFT
9 24626-ZV5-010 PLATE, SHIFT SHAFT
11 24629-ZW1-000 HOLDER, SEAL
13 35476-ZW1-010 BRACKET, NEUTRAL SWITCH
15 35618-ZW9-020 PLATE, NEUTRAL SWITCH
17 57264-759-003 BUSH (14X10)
18 90013-ZV0-010 BOLT, FLANGE (6X12)
19 90011-ZW9-000 BOLT, FLANGE (6X14) (CT200)
20 90014-ZV7-040 BOLT, FLANGE (6X35)
22 90302-ZV5-003 NUT, HEX. (20MM)
23 90406-KV3-780 WASHER (6MM)
24 90403-ZW1-000 WASHER, PLAIN (6MM)
25 90504-921-010 WASHER, PLAIN (6MM)
26 90508-ZV7-000 WASHER
27 90759-ZV1-000 PIN, SPLIT (2.0)
28 90765-ZW1-000 PIN, LOCK SPECIAL (6MM)
29 91255-ZV4-651 SEAL, WATER (14X26X6)
30 91305-KF0-003 O-RING (27X2) (ARAI)
31 94305-30183 PIN, SPRING (3X18)
32 94540-12029 E-RING (12MM)
33 95701-06012-02 BOLT, FLANGE (6X12)
35 24621-ZW5-000 BUSH, SHAFT
36 90011-ZW9-000 BOLT, FLANGE (6X14) (CT200)
SHORT BLOCK (0 parts)
SPEEDOMETER KIT (7 parts) SPEEDOMETER KIT
Ref OEM Part # Part Name
2 91302-ZE9-003 O-RING (11.8X2.4)
3 19270-ZW1-740 JOINT ASSY., HOSE
4 19270-881-812 NUT, WATER MOUTH
5 19270-ZW1-740 JOINT ASSY., HOSE
6 19272-881-810 SEAT, WATER MOUTH
7 32550-ZV5-910 HARNESS ASSY., METER (B)
9 39700-ZV5-800AH METER ASSY., HOUR L.C.D.
STARTER MOTOR (25 parts) STARTER MOTOR
Ref OEM Part # Part Name
1 17612-KR3-600 COLLAR, FUEL TANK MOUNTING
3 32136-659-000 COVER, TERMINAL
5 32660-MJ6-710 CLAMP, WIRE
6 35850-ZW1-003 SWITCH ASSY., STARTER MAGNETIC
7 84905-459-670 RUBBER A, NUMBER BRACKET CUSHION
8 90121-ZV0-010 BOLT, FLANGE (6X25)
9 90203-ZV5-000 NUT, HEX. (6MM)
11 90684-ZA0-601 CLIP, HARNESS
13 95701-10090-02 BOLT, FLANGE (10X90)
15 31213-ZW1-004 GEAR SET, PINION
17 31217-ZW1-004 ROTOR
18 31225-ZW1-004 STOPPER SET, PINION
19 31226-ZW1-004 BRUSH SET
20 31229-ZW1-004 STOPPER SET, SLEEVE
21 31231-ZW1-004 HOLDER, BRUSH
24 31240-ZW1-004 SWITCH ASSY., MAGNET
26 31246-ZW5-003 SHAFT ASSY., GEAR
27 31247-ZW1-004 GEAR ASSY. (INNER)
28 31249-ZW1-004 GASKET
29 31250-ZW1-004 LEVER SET
30 31261-ZW1-004 BOLT A, THROUGH
31 90106-ZW1-004 SCREW, PAN (6X22) (SPECIAL)
32 90107-ZW1-004 SCREW, PAN (5X8)
33 31215-PY3-004 GEAR ASSY., PLANETARY
34 31218-PY3-004 BALL, STEEL
STERN BRACKET/SWIVEL CASE (40 parts) STERN BRACKET/SWIVEL CASE
Ref OEM Part # Part Name
2 24210-ZV1-010 SPRING, CLICK
3 24221-ZV4-010 SPRING, CLICK ASSIST
9 50201-ZW1-040ZA CASE, SWIVEL *NH282MU* (OYSTER SILVER METALLIC-U)
10 50211-ZV5-003 LINER, SWIVEL CASE
11 50214-ZW1-000 BUSH, SWIVEL CASE
12 50301-ZW1-070ZA BRACKET, R. STERN *NH282MU* (OYSTER SILVER METALLIC-U)
13 50311-ZW1-070ZA BRACKET, L. STERN *NH282MU* (OYSTER SILVER METALLIC-U)
15 06503-ZW5-000 ROD KIT, ADJUST
16 50381-ZY9-000 SHAFT, TILTING
17 50522-ZV5-000 BUSH, TILT ARM
22 56516-ZW1-000 RECEIVER, THRUST
23 56539-ZZ0-C00 COLLAR, CYLINDER (LOWER)
24 90101-ZW5-000 BOLT, STUD (12X150)
25 90102-ZW1-000 BOLT (1/4-28UNF)
27 90108-ZW1-000 BOLT, HEX. (10X235)
29 90110-881-000 BOLT, HEX. (6X14)
30 90113-ZV5-000 BOLT, HEX. (6X25)
31 90129-ZW1-010 BOLT, HEX. (12X119)
32 90304-ZV5-013 NUT, SELF-LOCK (7/8-14UNF)
33 90304-ZW1-013 NUT, SELF-LOCK (25X2.0)
34 90306-ZV5-003 NUT, SELF-LOCK (10MM)
37 90308-ZW1-003 NUT, SELF-LOCK (12MM)
38 90501-ZV5-000 WASHER, WAVE (40MM)
39 90502-ZV5-000 WASHER, WAVE (26MM)
40 90502-ZW1-000 WASHER, WAVE (32MM)
41 90504-ZV5-000 WASHER, THRUST (34MM)
42 90504-921-010 WASHER, PLAIN (6MM)
43 90506-ZV4-000 WASHER, PLAIN (6MM)
45 90545-ZV5-000 WASHER, PLAIN (10MM)
46 90552-ZV5-000 WASHER, PLAIN (12MM)
47 90559-ZV5-000 WASHER, PLAIN (12MM)
48 90563-ZV5-000 WASHER, PLAIN (10MM)
49 90651-ZV5-000 CIRCLIP (OUTER) (39MM)
50 90681-763-A01 CLIP, WIRE HARNESS
51 90951-ZV7-010 NIPPLE, GREASE
52 91256-ZV5-003 OIL SEAL (39.5X52X6) (ARAI)
53 91352-ZV5-000 O-RING (15.54X2.62)
55 92101-06020-4J BOLT, HEX. (6X20)
56 94305-25203 PIN, SPRING (2.5X20)
58 04606-ZW1-000 STOPPER KIT, TILT
THERMOSTAT (16 parts) THERMOSTAT
Ref OEM Part # Part Name
1 19277-ZW1-000 COVER, FLUSH VALVE
2 19278-ZW1-000ZA SPACER, FLUSH VALVE *NH8* (DARK GRAY)
3 19279-ZW1-000 SPRING, FLUSH VALVE
4 19291-ZW1-000 VALVE, RELIEF
6 19295-ZW1-000 COVER, RELIEF VALVE
7 19296-ZW1-000 GASKET, RELIEF VALVE COVER
8 19297-ZW1-000 GASKET, RELIEF VALVE
10 19300-ZV5-043 THERMOSTAT ASSY.
11 19315-ZV5-010 COVER, THERMOSTAT
14 19371-ZW1-000 GASKET, WATER JACKET COVER
16 90013-ZV0-010 BOLT, FLANGE (6X12)
17 90121-ZV0-010 BOLT, FLANGE (6X25)
18 90023-ZY9-M01 BOLT, FLANGE (6X32) (CT200)
19 91356-SD4-952 O-RING (31.5X2.4) (ARAI)
20 95701-06040-02 BOLT, FLANGE (6X40)
21 95701-06055-02 BOLT, FLANGE (6X55)
THROTTLE CAM (18 parts) THROTTLE CAM
Ref OEM Part # Part Name
1 12328-ZW1-000 CLAMP, TUBE
3 16263-ZA0-000 JOINT, ROD
4 16574-ZV5-000 ARM A, CHOKE
7 16674-ZW1-000 ROD, CHOKE
9 17151-ZW1-000 GASKET, IN. MANIFOLD
12 17927-ZV5-000 PLATE, ASSIST
16 17938-ZV5-000 SPRING, OPENER CAM RETURN
19 17957-ZV4-000 BUSH, LINKAGE
21 90011-ZV5-003 BOLT, TORX (6X14)
22 90019-ZV1-010 BOLT, FLANGE (5X10)
23 90208-438-000 NUT, CAP (8MM)
24 90511-ZV4-000 WASHER, PLAIN (6MM)
25 91503-ZV5-000 COLLAR, DISTANCE (6.5X10.5X16)
28 95001-35003-60M BULK HOSE, FUEL (3.5X3000) (3.5X50)
29 95701-06016-02 BOLT, FLANGE (6X16)
30 95701-06030-02 BOLT, FLANGE (6X30)
31 95701-06045-02 BOLT, FLANGE (6X45)
32 95701-08035-02 BOLT, FLANGE (8X35)
TIMING BELT (13 parts) TIMING BELT
Ref OEM Part # Part Name
3 13622-PLC-000 PLATE, TIMING BELT GUIDE
5 14400-ZW1-004 BELT, TIMING
6 14510-ZW1-004 TENSIONER, TIMING BELT
7 14515-ZV5-000 CAP, TIMING BELT TENSIONER
8 14520-ZV5-020 SPRING, TIMING BELT ADJUSTING
9 40102-ZV5-000 GROMMET, CASE (LOWER)
10 90031-ZV5-000 BOLT, FLANGE (10X32)
11 90121-ZV0-010 BOLT, FLANGE (6X25)
12 90435-ZZ5-M00 WASHER (10X28X5)
13 91553-ZV5-010 COLLAR, MODULE IGNITION CONTROL CASE (CDI)
14 94103-06200 WASHER, PLAIN (6MM)
15 95701-10045-08 BOLT, FLANGE (10X45)
16 96220-40100 ROLLER (4X10)
TIMING BELT COVER/MOUNT CASE (8 parts) TIMING BELT COVER/MOUNT CASE
Ref OEM Part # Part Name
4 15665-ZW1-030 PIPE, OIL LEVEL
5 19274-ZW1-000 HOSE, FLUSHING WATER
9 90003-ZW1-305 BOLT, TIMING BELT COVER
10 90602-ZV5-013 CLAMP, TUBE (D22)
11 90602-921-000 CLIP, TUBE (B8)
12 90602-ZV3-030 CLAMP, TUBE (D18.8)
13 91202-ZW5-003 SEAL, WATER (22X35X7)
14 91309-PJ7-010 O-RING (11.5X3.5)
TOOLS (8 parts) TOOLS
Ref OEM Part # Part Name
1 28470-816-000 ROPE, STARTER
5 89301-921-010 SCREWDRIVER, CHECK BOLT
6 99001-10120 SPANNER (10X12)
7 99001-14170 SPANNER (14X17)
8 89210-GBJ-J10 PLIERS (135) (KOWA)
9 99003-10000 DRIVER 1, PLUS SCREW (NO.2)
10 99003-30000 DRIVER 3, MINUS SCREW (NO.2)
11 99003-40000 LEVER
WATER PUMP/VERTICAL SHAFT (2 parts) WATER PUMP/VERTICAL SHAFT
Ref OEM Part # Part Name
8 19251-ZW1-900 TUBE, WATER (L)
15 40204-ZW1-000 GROMMET, EXTENSION CASE

100-Hour / Annual Service Checklist

A thorough annual service keeps your Honda BF90 running efficiently and helps catch small problems before they become expensive repairs. Most of these tasks can be completed in a single afternoon with standard tools.

  1. Change engine oil and replace the oil filter.
  2. Replace all four spark plugs and inspect ignition coil boots for cracking.
  3. Remove the lower unit and replace the water pump impeller, gaskets, and wear plate.
  4. Drain and refill lower unit gear oil; check for water or metal contamination.
  5. Replace the fuel filter and inspect all fuel hoses and connections.
  6. Inspect all sacrificial anodes and replace any that are more than 50% consumed.
  7. Check the propeller for nicks, bends, and fishing line around the shaft; clean and inspect thrust washer.
  8. Lubricate all grease fittings including the swivel tube, steering arm, and tilt mechanism.
  9. Inspect the timing belt for cracks, wear, or contamination from oil leaks.
  10. Test the engine warning system, emergency stop switch, and all gauge functions.

Pro Tips:

  • After every saltwater outing, run the engine on fresh water with a flush adapter for at least five minutes at idle. This simple habit dramatically extends the life of your thermostat, water pump, and internal cooling passages.
  • Replace the fuel filter at the start of every season even if it looks clean. Modern ethanol-blended fuels degrade filters faster than you might expect, and a restricted filter under load can cause injector damage.
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