🔎 Honda B75 Resource Center — Browse exploded parts diagrams (23 diagrams), specifications, and maintenance tips below. Scroll down to shop replacement parts for your Honda B75.
The Honda B75 is a classic 75-horsepower, 4-cylinder, 4-stroke outboard motor produced by Honda Marine. Originally introduced in the early 1980s, the B75 was designed as a reliable mid-range powerplant for center-console fishing boats, small cabin cruisers, and multi-purpose utility vessels. Known for its smooth-running inline-four layout and exceptional fuel economy for its era, the B75 earned a loyal following among commercial and recreational boaters alike. Although long since discontinued, thousands of B75 engines remain in active service worldwide, making OEM replacement parts and quality aftermarket marine parts essential for keeping these workhorses running.
At Womarine.com, we provide comprehensive exploded parts diagrams and a full catalog of replacement components for the Honda B75. Whether you're tackling a DIY boat engine repair — replacing a water pump impeller, rebuilding the carburetor, or servicing the lower unit — our detailed diagrams and competitively priced parts make the job easier. Browse below for specifications, maintenance tips, and interactive parts diagrams with OEM part numbers.
Quick Reference Specifications
| Specification |
Value |
| Engine Type |
4-Stroke, 4-Cylinder, OHC |
| Displacement |
808 cc |
| Bore x Stroke |
60 x 45 mm |
| Spark Plug (Type & Gap) |
NGK D5HS or equivalent; Gap: 0.024–0.028 in (0.6–0.7 mm) |
| Engine Oil Capacity |
Refer to Owner's Manual |
| Recommended Engine Oil |
SAE 10W-30 or 10W-40 4-Stroke Marine Oil (API SG or higher) |
| Gear Case Oil Capacity |
Refer to Owner's Manual |
| Idle Speed (in gear) |
Refer to Owner's Manual |
| Full Throttle RPM Range |
4,500–5,500 rpm |
| Fuel |
Unleaded Gasoline, 87 Octane minimum |
Always verify specifications against your Honda B75 Owner's Manual for your specific serial number range.
Common Issues & Recommended Parts
The Honda B75 is a robust engine, but like any outboard with decades of service, certain components require periodic attention:
-
Water Pump / Overheating: If your B75 is not producing a steady stream of water from the tell-tale or is running hotter than normal, the water pump impeller is the most likely culprit. Rubber impellers harden and crack over time. → Recommended: Water Pump Impeller Kit
-
Hard Starting / Rough Idle: Difficulty starting or inconsistent idle often points to a worn carburetor. Gaskets and jets deteriorate after years of ethanol-blended fuel exposure. → Recommended: Carburetor Repair Kit, Spark Plugs
-
Gear Oil Leaks / Shifting Problems: Milky or low gear oil indicates a compromised seal in the lower unit. Left unaddressed, water intrusion can destroy gears and bearings. → Recommended: Lower Unit Seal Kit, O-Rings
-
Fuel System Deterioration: Cracked fuel lines, clogged filters, and failing fuel pumps are common on older B75 engines. → Recommended: Fuel Filter, Fuel Pump Diaphragm, Fuel Line Kit
-
Corrosion & Anode Wear: Saltwater accelerates galvanic corrosion. Sacrificial anodes must be inspected and replaced regularly. → Recommended: Zinc Anode Kit
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 B75.
▶CAM PULLEY/POINTS (11 parts)
| Ref |
OEM Part # |
Part Name |
| 6 |
14400-921-024 |
BELT, TIMING |
| 13 |
87581-921-600 |
MARK, POINT |
| 19 |
90478-700-000 |
WASHER A (6MM) |
| 20 |
90604-921-000 |
CLIP, TUBE (C11) |
| 25 |
92101-06025-0B |
BOLT, HEX. (6X25) |
| 26 |
92201-06028-0B |
BOLT, HEX. (6X28) |
| 27 |
93500-05008-0B |
SCREW, PAN (5X8) |
| 28 |
93500-05012-0B |
SCREW, PAN (5X12) |
| 29 |
94101-05200 |
WASHER, PLAIN (5MM) |
| 30 |
94101-06200 |
WASHER, PLAIN (6MM) |
| 31 |
94111-05800 |
WASHER, SPRING (5MM) |
▶CAMSHAFT/VALVE (6 parts)
| Ref |
OEM Part # |
Part Name |
| 2 |
12023-921-000 |
GUIDE, VALVE |
| 8 |
14711-921-000 |
VALVE, IN. |
| 10 |
14753-921-010 |
SPRING, VALVE |
| 14 |
14775-921-000 |
SEAT, VALVE SPRING |
| 15 |
14781-235-000 |
COTTER, VALVE (NOT AVAILABLE) |
| 18 |
90453-235-000 |
WASHER, THRUST (16MM) |
▶CARBURETOR (9 parts)
| Ref |
OEM Part # |
Part Name |
| 15 |
90602-921-000 |
CLIP, TUBE (B8) |
| 19 |
93500-04006-0H |
SCREW, PAN (4X6) |
| 21 |
93500-04012-0H |
SCREW, PAN (4X12) |
| 22 |
93500-04016-0H |
SCREW, PAN (4X16) |
| 23 |
94101-06200 |
WASHER, PLAIN (6MM) |
| 24 |
94111-03800 |
WASHER, SPRING (3MM) |
| 25 |
95001-35003-60M |
BULK HOSE, FUEL (3.5X3000) (3.5X215) |
| 26 |
95001-45003-60M |
BULK HOSE, FUEL (4.5X3000) (4.5X355) |
| 27 |
95001-45003-60M |
BULK HOSE, FUEL (4.5X3000) (4.5X355) |
▶CYLINDER/CYLINDER HEAD (14 parts)
| Ref |
OEM Part # |
Part Name |
| 8 |
13315-921-013 |
BEARING, CRANKSHAFT (STD) (NOT AVAILABLE) |
| 9 |
15611-921-000 |
CAP, OIL (YELLOW) |
| 18 |
90017-935-000 |
BOLT, HEAD (8X70) |
| 19 |
90018-935-000 |
BOLT, HEAD (8X94) |
| 20 |
90402-822-000 |
WASHER, HEAD (8MM) |
| 22 |
91206-921-000 |
OIL SEAL (16X28X6) |
| 23 |
91301-805-000 |
O-RING (26X2.7) |
| 26 |
92101-06025-0B |
BOLT, HEX. (6X25) |
| 27 |
92201-06028-0B |
BOLT, HEX. (6X28) |
| 32 |
93500-05008-0B |
SCREW, PAN (5X8) |
| 33 |
94101-06200 |
WASHER, PLAIN (6MM) |
| 34 |
94301-08140 |
PIN, DOWEL (8X14) |
| 35 |
94301-10140 |
PIN A, DOWEL (10X14) |
| 36 |
98066-55710 |
SPARK PLUG (D5HS) (NGK) |
▶FUEL PUMP/COVER (5 parts)
| Ref |
OEM Part # |
Part Name |
| 18 |
90602-921-000 |
CLIP, TUBE (B8) |
| 20 |
92201-06028-0B |
BOLT, HEX. (6X28) |
| 22 |
93500-06025-0A |
SCREW, PAN (6X25) |
| 24 |
94101-06200 |
WASHER, PLAIN (6MM) |
| 25 |
95001-45003-60M |
BULK HOSE, FUEL (4.5X3000) (4.5X450) |
▶FUEL TANK (8 parts)
| Ref |
OEM Part # |
Part Name |
| 19 |
17650-921-003ZB |
CONNECTOR, FUEL *NH1* (BLACK) |
| 20 |
17661-921-010 |
BULB, PRIMER |
| 22 |
17680-921-000 |
VALVE, OUTLET |
| 30 |
17703-921-010 |
BAND, TUBE CLIP (20MM) |
| 36 |
90515-921-000 |
WASHER, PIPE (INNER) |
| 37 |
90517-921-000 |
WASHER, JOINT TUBE |
| 38 |
91353-921-310 |
O-RING (5.5MM) |
| 39 |
92101-06012-4J |
BOLT, HEX. (6X12) |
▶GASKET KIT (4 parts)
| Ref |
OEM Part # |
Part Name |
| 12 |
91301-PC9-003 |
O-RING (7.7X2.3) (ARAI) |
| 15 |
91301-805-000 |
O-RING (26X2.7) |
| 17 |
91304-KK3-830 |
O-RING (9.4X2.4) |
| 18 |
91311-881-003 |
O-RING (62X2.5) |
▶GEAR CASE/EXTENSION CASE (14 parts)
| Ref |
OEM Part # |
Part Name |
| 5 |
24341-ZV4-300 |
ROD, PUSH |
| 8 |
41100-935-020N |
CASE, GEAR *PB1* (DARK BLUE) |
| 18 |
90504-921-010 |
WASHER, PLAIN (6MM) |
| 19 |
94101-08000 |
WASHER, PLAIN (8MM) |
| 20 |
90855-921-300 |
PLUG, SEALING (10MM) |
| 21 |
91253-921-003 |
SEAL, WATER (6MM) |
| 22 |
91304-KK3-830 |
O-RING (9.4X2.4) |
| 23 |
92101-06012-4J |
BOLT, HEX. (6X12) |
| 25 |
92101-08050-4J |
BOLT, HEX. (8X50) |
| 26 |
94002-08490-0S |
NUT, HEX. (8MM) |
| 27 |
94301-08100 |
PIN, DOWEL (8X10) |
| 28 |
94301-10140 |
PIN A, DOWEL (10X14) |
| 29 |
94305-25122 |
PIN, SPRING (2.5X12) |
| 30 |
96220-25118 |
ROLLER (2.5X11.8) |
▶HANDLEBAR (3 parts)
| Ref |
OEM Part # |
Part Name |
| 6 |
17936-921-000 |
WASHER, PIVOT |
| 20 |
92101-06012-0B |
BOLT, HEX. (6X12) |
| 21 |
94002-05000-0S |
NUT, HEX. (5MM) |
▶IGNITION COIL/FLYWHEEL (10 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
28571-935-000H |
PULLEY, STARTER RATCHET *R8* (BRIGHT RED) |
| 5 |
30700-MG7-000 |
CAP ASSY., NOISE SUPPRESSOR |
| 11 |
93500-05012-0B |
SCREW, PAN (5X12) |
| 12 |
93500-05025-0B |
SCREW, PAN (5X25) |
| 13 |
93500-06020-0H |
SCREW, PAN (6X20) |
| 15 |
94001-05020-0S |
NUT, HEX. (5MM) |
| 16 |
94001-05080-0S |
NUT, HEX. (5MM) |
| 17 |
94101-05200 |
WASHER, PLAIN (5MM) |
| 18 |
94101-06200 |
WASHER, PLAIN (6MM) |
| 19 |
94111-05800 |
WASHER, SPRING (5MM) |
▶INLET MANIFOLD (7 parts)
| Ref |
OEM Part # |
Part Name |
| 6 |
19300-881-741 |
THERMOSTAT ASSY. |
| 7 |
19302-921-003 |
RUBBER, THERMOSTAT |
| 8 |
19311-921-010KA |
COVER, THERMOSTAT *NH8* (DARK GRAY) (NOT AVAILABLE) |
| 10 |
90602-921-000 |
CLIP, TUBE (B8) |
| 11 |
90604-921-000 |
CLIP, TUBE (C11) |
| 14 |
92201-06028-0B |
BOLT, HEX. (6X28) |
| 19 |
94101-06200 |
WASHER, PLAIN (6MM) |
▶OIL CASE/ENGINE COVER (8 parts)
| Ref |
OEM Part # |
Part Name |
| 20 |
90504-921-010 |
WASHER, PLAIN (6MM) |
| 22 |
90512-921-010 |
WASHER (6MM) |
| 25 |
91305-PE2-003 |
O-RING (9.8X1.9) |
| 26 |
92101-05010-4J |
BOLT, HEX. (5X10) |
| 27 |
92101-06016-0B |
BOLT, HEX. (6X16) |
| 29 |
90113-ZV0-000 |
BOLT, HEX. (6X35) |
| 31 |
93500-04008-0G |
SCREW, PAN (4X8) |
| 33 |
94301-08140 |
PIN, DOWEL (8X14) |
▶OIL PUMP/OIL FILTER /MUFFLER (5 parts)
| Ref |
OEM Part # |
Part Name |
| 6 |
18201-935-030 |
PIPE, EX. (NOT AVAILABLE) |
| 8 |
90478-700-000 |
WASHER A (6MM) |
| 10 |
91301-PC9-003 |
O-RING (7.7X2.3) (ARAI) |
| 12 |
92101-06016-0B |
BOLT, HEX. (6X16) |
| 13 |
92201-06028-0B |
BOLT, HEX. (6X28) |
▶OPTIONAL PARTS (4 parts)
| Ref |
OEM Part # |
Part Name |
| 4 |
19262-921-810 |
MOUTH, WATER |
| 15 |
93500-05022-0B |
SCREW, PAN (5X22) |
| 16 |
93500-05025-0B |
SCREW, PAN (5X25) |
| 17 |
93500-06035-0A |
SCREW, PAN (6X35) |
▶PISTON/CRANKSHAFT (4 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
13011-121-762 |
RING SET, PISTON |
| 6 |
13316-921-013 |
BEARING, CRANKSHAFT THRUST |
| 8 |
90402-921-000 |
WASHER (6MM) |
| 12 |
94401-16150 |
KEY, WOODRUFF (16X15) |
▶PROPELLER SHAFT (11 parts)
| Ref |
OEM Part # |
Part Name |
| 4 |
24123-921-300 |
SPRING, SHIFT |
| 7 |
41158-921-000 |
SHIM B, GEAR (0.15MM) |
| 8 |
41160-935-010 |
SHAFT, PROPELLER |
| 14 |
58131-935-010 |
PIN, SHEAR |
| 15 |
58141-935-000 |
CAP, PROPELLER (NOT AVAILABLE) |
| 17 |
90504-921-010 |
WASHER, PLAIN (6MM) |
| 19 |
90757-921-000 |
PIN, SPLIT (3MM) |
| 20 |
91251-935-004 |
SEAL, WATER (17MM) (NOK) |
| 21 |
91311-881-003 |
O-RING (62X2.5) |
| 22 |
92101-06020-4J |
BOLT, HEX. (6X20) |
| 23 |
96100-60050-00 |
BEARING, RADIAL BALL (6005) |
▶RECOIL STARTER (8 parts)
| Ref |
OEM Part # |
Part Name |
| 2 |
28421-921-010 |
PULLEY, RECOIL STARTER (NOT AVAILABLE) |
| 4 |
28443-935-000 |
PLATE, FRICTION |
| 6 |
28445-935-000 |
WASHER |
| 8 |
28451-921-000 |
SPRING, RECOIL STARTER |
| 10 |
28454-921-000 |
GUIDE, ROPE |
| 17 |
28401-921-000KA |
CASE, RECOIL STARTER *NH8* (DARK GRAY) (NOT AVAILABLE) |
| 18 |
90016-920-000 |
BOLT, FLANGE (6X12) |
| 20 |
94111-06000 |
WASHER, SPRING (6MM) |
▶SETTING FRAME (6 parts)
| Ref |
OEM Part # |
Part Name |
| 4 |
50112-921-300 |
SPRING, HANDLE |
| 9 |
90511-921-000 |
WASHER, PLAIN (10MM) |
| 10 |
90514-921-000 |
WASHER (8MM) |
| 12 |
94002-08490-0S |
NUT, HEX. (8MM) |
| 13 |
94101-08000 |
WASHER, PLAIN (8MM) |
| 14 |
94305-60503 |
PIN, SPRING (6X50) |
▶SHIFT SHAFT/CARRYING HANDLE (16 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
17710-921-020KA |
CONNECTOR, FUEL *NH8* (DARK GRAY) (NOT AVAILABLE) |
| 7 |
17951-921-030 |
KNOB, CHOKE |
| 11 |
24621-921-010 |
BUSH, SHAFT |
| 12 |
24701-921-040N |
LEVER, GEARSHIFT *PB1* (DARK BLUE) (NOT AVAILABLE) |
| 13 |
24705-921-000 |
PIN, SHIFT LEVER |
| 21 |
50281-921-000N |
HANDLE, CARRYING *PB1* (DARK BLUE) |
| 25 |
63205-920-000 |
BUSH, COVER LOCK |
| 26 |
90302-921-000 |
NUT, HEX. (16MM) |
| 27 |
90407-920-000 |
WASHER, SPRING (6MM) |
| 28 |
90512-921-010 |
WASHER (6MM) |
| 29 |
90754-921-010 |
PIN (5X17) |
| 30 |
90756-921-000 |
PIN, SPLIT (1.6MM) |
| 32 |
92101-06012-0B |
BOLT, HEX. (6X12) |
| 33 |
92101-06016-0B |
BOLT, HEX. (6X16) |
| 37 |
94021-06020 |
NUT, CAP (6MM) |
| 38 |
94101-08000 |
WASHER, PLAIN (8MM) |
▶STERN BRACKET (15 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
50122-935-010 |
PLATE, PUSH |
| 5 |
50325-935-300 |
SCREW, CLAMP (NOT AVAILABLE) |
| 10 |
50341-921-300 |
ROD, ADJUSTING (NOT AVAILABLE) |
| 12 |
50343-921-300 |
SPRING, ADJUSTING ROD |
| 13 |
58131-935-010 |
PIN, SHEAR |
| 15 |
90106-921-010 |
BOLT, TILTING |
| 17 |
90407-920-000 |
WASHER, SPRING (6MM) |
| 18 |
90504-921-010 |
WASHER, PLAIN (6MM) |
| 19 |
90511-921-000 |
WASHER, PLAIN (10MM) |
| 20 |
90513-921-000 |
WASHER (10MM) |
| 21 |
90514-921-000 |
WASHER (8MM) |
| 22 |
90757-921-000 |
PIN, SPLIT (3MM) |
| 24 |
94001-06490-0S |
NUT, HEX. (6MM) |
| 25 |
94305-20083 |
PIN, SPRING (2X8) |
| 26 |
94305-40143 |
PIN, SPRING (4X14) |
▶SWIVEL CASE/SWIVEL SHAFT (6 parts)
| Ref |
OEM Part # |
Part Name |
| 7 |
50231-921-010 |
PLATE, FRICTION |
| 18 |
90016-920-000 |
BOLT, FLANGE (6X12) |
| 21 |
90511-921-000 |
WASHER, PLAIN (10MM) |
| 22 |
92101-06025-4J |
BOLT, HEX. (6X25) |
| 23 |
94305-20203 |
PIN, SPRING (2X20) |
| 24 |
94305-40143 |
PIN, SPRING (4X14) |
▶TOOLS/STARTER ROPE (9 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
28470-816-000 |
ROPE, STARTER |
| 4 |
89301-921-010 |
SCREWDRIVER, CHECK BOLT |
| 5 |
99001-09120 |
SPANNER (9X12) |
| 6 |
99001-10120 |
SPANNER (10X12) |
| 7 |
89210-GBJ-J10 |
PLIERS (135) (KOWA) |
| 8 |
99003-10000 |
DRIVER 1, PLUS SCREW (NO.2) |
| 9 |
99003-30000 |
DRIVER 3, MINUS SCREW (NO.2) |
| 10 |
99003-40000 |
LEVER |
| 11 |
99004-18190 |
WRENCH, BOX (P18X19) |
▶WATER PUMP/VERTICAL SHAFT (8 parts)
| Ref |
OEM Part # |
Part Name |
| 2 |
19210-935-003 |
IMPELLER, PUMP |
| 8 |
19252-921-020 |
RING, SEAL |
| 13 |
41136-935-003 |
WASHER B, THRUST BEARING (2.05MM) |
| 14 |
94301-08100 |
PIN, DOWEL (8X10) |
| 16 |
90504-921-010 |
WASHER, PLAIN (6MM) |
| 18 |
91252-935-004 |
SEAL, WATER (15MM) (NOK) |
| 19 |
92101-06028-4J |
BOLT, HEX. (6X28) |
| 20 |
96100-63020-00 |
BEARING, RADIAL BALL (6302) |
100-Hour / Annual Service Checklist
Regular maintenance is the single most important factor in extending the life of your Honda B75. Many routine service tasks can be performed by owners with basic mechanical skills and the right parts.
- Change engine oil and replace oil filter (if equipped)
- Replace spark plugs and check ignition timing
- Inspect and replace water pump impeller
- Drain and refill lower unit gear oil; inspect for water contamination
- Replace fuel filter and inspect all fuel lines for cracks or swelling
- Inspect and clean carburetor; rebuild if necessary
- Check and replace sacrificial anodes (zincs)
- Inspect propeller for damage; check propeller shaft seal
- Grease all steering and throttle linkage points
- Inspect thermostat operation and coolant passages for salt buildup
Pro Tips:
-
Always flush after saltwater use: Run the engine on fresh water for at least 5 minutes using a flush attachment. This prevents salt crystal buildup in the cooling passages — the number one cause of premature overheating.
-
Use marine-grade anti-seize on spark plugs and bolts: The aluminum cylinder head is prone to seizing with steel spark plugs if anti-seize compound is not applied.