🔎 Honda B75 Reference Library — Exploded parts diagrams (23 diagrams), specifications, common issues, and maintenance checklist.
The Honda B75 is a 4-Stroke Single-Cylinder, Water-Cooled outboard motor. Suited for bay boats, pontoons, and center-console fishing boats requiring reliable mid-range power.
Quick Reference Specifications
| Specification |
Value |
| Engine Type |
4-Stroke Single-Cylinder, Water-Cooled |
| Horsepower |
75 HP |
| Displacement |
89 cc (5.4 cu in) |
| Bore x Stroke |
52 x 42 mm (2.05 x 1.65 in) |
| Spark Plug (Type & Gap) |
NGK B6HS |
| Engine Oil Capacity |
0.6 L (0.63 US qt) |
| Recommended Engine Oil |
SAE 10W-30 4-Stroke Motor Oil (API SE or higher) |
| Gear Case Oil Capacity |
130 mL (4.4 fl oz) |
| Idle Speed (in gear) |
1000 ± 100 RPM (in gear) |
| Full Throttle RPM Range |
4500-5500 RPM |
| Fuel |
Unleaded Gasoline, 86 Octane min. |
Always verify specifications against your owner's manual for your specific serial number range.
Common Issues & Recommended Parts
Below are common maintenance scenarios for the Honda B75:
-
Water Pump / Overheating: If the tell-tale stream is weak or absent, the water pump impeller likely needs replacement. Inspect annually or every 100 hours. → Recommended: Water Pump Impeller Kit
-
Engine Oil / Maintenance Light: 4-stroke engines require regular oil and filter changes. Use marine-grade oil rated for your engine. Change every 100 hours or annually. → Recommended: Oil Filter, Engine Oil
-
Fuel Injector Issues (EFI models): Rough idle or misfires may indicate clogged fuel injectors. Use fuel stabilizer and clean injectors periodically. → Recommended: Fuel Injector, Fuel Filter
-
Gear Case Oil Leak: Check lower unit seals if gear oil appears milky (water contamination). Replace seals and gaskets during lower unit service. → Recommended: Lower Unit Seal Kit, Drain Plug Gaskets
-
Anode Corrosion: Inspect sacrificial anodes regularly, especially in saltwater. Replace when 50% depleted to protect against galvanic corrosion. → Recommended: Zinc/Aluminum 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 keeps your Honda B75 running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.
- Replace water pump impeller and inspect wear plate
- Change engine oil and oil filter (check drain plug washer)
- Replace spark plugs and check ignition timing
- Drain and refill lower unit gear oil; inspect for water contamination
- Inspect fuel lines, primer bulb, and fuel filter for deterioration
- Check and replace sacrificial anodes (zinc or aluminum)
- Inspect propeller for damage; check shaft seal and cotter pin
- Check valve clearance (refer to service manual for specifications)
- Lubricate all grease points (steering, tilt tube, shift linkage)
- Inspect control cables and throttle/shift linkage for smooth operation
-
Pro Tip: Always flush the engine with fresh water after saltwater use — even a quick 10-minute flush significantly extends component life.
-
Pro Tip: Use fuel stabilizer in the tank before winter storage, and fog the cylinders to prevent internal corrosion during extended periods of non-use.
