Mercury 25 (9332837X THRU 9390058X) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 25. Scroll down for exploded parts diagrams (19), specifications, and maintenance reference.

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8M0120867 Maintenance Kit for Mercury 8HP 9.9HP 15HP 20HP Command Thrust | JLM Marine
8M0120867 Maintenance Kit for Mercury 8HP 9.9HP 15HP 20HP Command Thrust | JLM Marine
$68.50
$68.50
files/kit-23KM773-4N_fffc370d-57ef-443b-8e26-770e764dd409.pngDefault Title
$68.50
8M0181316 Maintenance Kit for Mercury 8HP 9.9HP | JLM Marine
8M0181316 Maintenance Kit for Mercury 8HP 9.9HP | JLM Marine
$68.50
$68.50
files/kit-23KM772-4N_3ab7931f-955d-4041-a46b-266974344a7b.pngDefault Title
$68.50
8M0181315 Maintenance Kit for Mercury 4HP 5HP 6HP 4-Stroke | JLM Marine
8M0181315 Maintenance Kit for Mercury 4HP 5HP 6HP 4-Stroke | JLM Marine
$68.50
$68.50
files/kit-23KM771-4N_78ebfc47-2fbf-460e-834a-362ab0b58149.pngDefault Title
$68.50
23KH763-4N Kit Image
06211-ZZ0-505 Maintenance Kit for Honda BF80A BF100A | JLM Marine
$82.50
$82.50
files/kit-23KH763-4N.pngDefault Title
$82.50
06211-ZY2-506 Maintenance Kit for Honda BF175A BF200A BF225A | JLM Marine
06211-ZY2-506 Maintenance Kit for Honda BF175A BF200A BF225A | JLM Marine
$83.50
$83.50
files/kit-23KH762-4N.pngDefault Title
$83.50
06211-ZY5-505 Maintenance Kit for Honda BF135A BF150A | JLM Marine
06211-ZY5-505 Maintenance Kit for Honda BF135A BF150A | JLM Marine
$82.50
$82.50
files/kit-23KH761-4N.pngDefault Title
$82.50
06211-ZW5-505 Maintenance Kit for Honda BF115A BF130A | JLM Marine
06211-ZW5-505 Maintenance Kit for Honda BF115A BF130A | JLM Marine
$82.50
$82.50
files/kit-23KH760-4N.pngDefault Title
$82.50
06211-ZW0-505 Maintenance Kit for Honda BF75A BF90A | JLM Marine
06211-ZW0-505 Maintenance Kit for Honda BF75A BF90A | JLM Marine
$71.50
$71.50
files/kit-23KH758-4N.pngDefault Title
$71.50

Mercury 25 (9332837X THRU 9390058X) Parts & Diagrams

🔎 Mercury 25 Reference Library — Exploded parts diagrams (19 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 25 is a 4-Stroke, Inline 3-Cylinder, EFI outboard motor. Commonly used on jon boats, pontoons, and mid-size utility craft.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke, Inline 3-Cylinder, EFI
Horsepower 25 HP
Displacement 526 cc
Bore x Stroke 61 mm x 57 mm
Spark Plug (Type & Gap) NGK BKR6E
Engine Oil Capacity 1.8 L (1.9 quart)
Recommended Engine Oil SAE 25W-40 Synthetic Blend Mercury FC-W
Gear Case Oil Capacity 280-350 mL (9.5-12 fl oz)
Idle Speed (in gear) 700 ± 50 RPM (in gear)
Full Throttle RPM Range 5000-6000
Fuel Unleaded Gasoline, 87 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 Mercury 25:

  • 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 Mercury 25.

▶BELGIUM ENGINES (8 parts) BELGIUM ENGINES
Ref OEM Part # Part Name
1 95845T VOLTAGE REGULATOR
2 10-92799 SCREW,VOLTAGE REGULATOR TO MANIFOLD COVER(1-1/8")
3 11-45076 NUT,VOLTAGE REFULATOR TERMINAL
4 84-74725A2 HARNESS ASSEMBLY,VOLTAGE REGULATOR (BLACK/RED)
5 71663 PLUG,HARNESS
6 84-65017A2 HARNESS ASSEMBLY,LIGHTING(EXTERNAL)
7 86704A10 STATOR ASSEMBLY
8 10-4000123 SCREW,STATOR ATTACHING (30MM)
▶CARBURETOR ASSEMBLY (MERC 18) (23 parts) CARBURETOR ASSEMBLY (MERC 18)
Ref OEM Part # Part Name
1 1390-8888A16 CARBURETOR ASSEMBLY (ELECTRIC)
2 1395-9168 THROTTLE VALVE
3 1395-9695 THROTTLE SHAFT
4 1395-9164 FUEL BOWL
5 1395-91691 FLOAT
6 1395-803861 VALVE,INLET NEEDLE
7 1399-5317 JET,MAIN FUEL (.046)
8 1395-9171 PLUG,JET RETAINER
9 813618 COVER,DIAPHRAGM
10 1395-9697 SCREW,DIAPHRAGM COVER
11 1395-9702 COVER,FUEL PUMP
12 1395-9173 SCREW,FUEL PUMP COVER
13 1395-823433 PLATE,COVER(ELECTRIC)
14 1395-9696 SCREW,COVER PLATE
15 1395-97611 GASKET/DIAPHRAGM KIT
16 1395-96481 REPAIR PARTS KIT
17 27-192061 GASKET,CARBURETOR
18 41717T BRACKET,PRIMER
19 10-400018 SCREW,BRACKET TO CARBURETOR
20 42515A1 LEVER ASSEMBLY,FAST IDLE
21 41703 LEVER,PRIMER
22 12733 IDLE WIRE
23 110241 ACTUATOR,PRIMER
▶CARBURETOR ASSEMBLY (MERC 25) (22 parts) CARBURETOR ASSEMBLY (MERC 25)
Ref OEM Part # Part Name
1 1390-8677A11 CARBURETOR ASSEMBLY (ELECTRIC)
2 1395-9180 THROTTLE VALVE
3 1395-9695 THROTTLE SHAFT
4 1395-9164 FUEL BOWL
5 1395-91691 FLOAT
6 1395-803861 VALVE,INLET NEEDLE
7 1395-6201 JET,MAIN FUEL(.080)
8 1395-9171 PLUG,JET RETAINER
9 813618 COVER,DIAPHRAGM
10 1395-9697 SCREW,DIAPHRAGM COVER
11 1395-9702 COVER,FUEL PUMP
12 1395-9173 SCREW,FUEL PUMP COVER
13 1395-823433 PLATE,COVER(ELECTRIC)
14 1395-9696 SCREW,COVER PLATE
15 1395-97611 GASKET/DIAPHRAGM KIT
16 1395-96481 REPAIR PARTS KIT
17 27-192061 GASKET,CARBURETOR
19 10-400018 SCREW,BRACKET TO CARBURETOR
20 42515A1 LEVER ASSEMBLY,FAST IDLE
21 41703 LEVER,PRIMER
22 12733 IDLE WIRE
23 110241 ACTUATOR,PRIMER
▶CLAMP BRACKET ASSEMBLY (26 parts) CLAMP BRACKET ASSEMBLY
Ref OEM Part # Part Name
1 1497-8794A1 CLAMP BRACKET ASSEMBLY (PORT)
2 1497-8794A5 CLAMP BRACKET ASSEMBLY (STARBOARD)
3 10-92767A1 THUMB SCREW ASSEMBLY
4 12-73719 WASHER,THUMB SCREW
5 10-768042 SCREW,WASHER ATTACHING
6 41042 HANDLE,CARRYING
7 17-99929A1 TILT PIN ASSEMBLY
8 16-99928 STUD,CLAMP BRACKET
9 23-41041 SPACER,CLAMP BRACKET STUD
10 11-400213 NUT,CLAMP BRACKET STUD
11 8M0035075 TILT TUBE
12 54-8M0085928 CLIP,SAFETY
13 11-93164 NUT,TILT TUBE
14 10-69064 BOLT,CLAMP BRACKET TO TRANSOM
15 12-67981 WASHER,CLAMP BRACKET BOLT
16 11-82670910 NUT,CLAMP BRACKET BOLT
17 96965 LEVER,TILT STOP-STARBOARD SIDE
18 10-41523 SCREW,LEVER TO SWIVEL BRACKET
19 11-36069 NUT,TILT STOP LEVER SCREW
20 10-41524 SCREW,LEVER TO CLAMP BRACKET
21 24-44581 SPRING,TILT STOP LEVER SCREW
22 90901 STRAP,TILT STOP-PORT SIDE
23 10-41523 SCREW,STRAP TO SWIVEL BRACKET
24 11-36069 NUT,TILT STOP STRAP SCREW
25 10-41524 SCREW,STRAP TO CLAMP BRACKET
26 13-31030 WAVE WASHER,TILT STOP STRAP SCREW
▶COWLS (17 parts) COWLS
Ref OEM Part # Part Name
1 2190-9163A22 TOP COWL ASSEMBLY (WITHOUT DECALS)
2 43515 HINGE, COWL LATCH
3 43555 BRACKET,TOP COWL
4 10-400018 SCREW,HINGE TO TOP COWL
5 2176-9107A2 BOTTOM COWL ASSEMBLY,PORT (WITHOUT DECALS)
6 15067A1 SEAL,BOTTOM COWL
7 43514 LATCH,BOTTOM COWL
8 10-400018 SCREW, LATCH TO BOTTOM COWL
9 2176-9108A1 BOTTOM COWL ASSEMBLY,STARBOARD (WITHOUT DECALS)
10 25-41604 GROMMET,BOTTOM COWL
11 15865 PLATE,BOTTOM COWL
12 10-95700 SCREW,PLATE TO BOTTOM COWL (1/2")
13 43554A5 BRACKET,COWL LATCH
14 10-400018 SCREW,BRACKET TO BOTTOM COWL (12MM)
15 17-25870 ROLL PIN,LINK
16 43554A5 LINK,COWL LATCH
17 43554A5 LATCH,COWL-REAR
▶CRANKSHAFT,PISTONS AND FLYWHEEL (21 parts) CRANKSHAFT,PISTONS AND FLYWHEEL
Ref OEM Part # Part Name
1 258-859232T15 FLYWHEEL ASSEMBLY
2 10-97359A1 SCREW,FLYWHEEL TO CRANKSHIFT
3 12-86496 WASHER,FLYWHEEL SCREW
4 43-99301 RING GEAR,FLYWHEEL-ELECTRIC
5 10-88190313 SCREW, RING GEAR TO FLYWHEEL -ELECTRIC
6 464-8978T2 CRANKSHAFT ASSEMBLY -ELECTRIC
7 85981 SEAL CRANKSHAFT
8 26-85107 OIL SEAL,CRANKSHAFT-LOWER
9 31-85113T ROLLER BEARING,CRANKSHAFT-LOWER
10 31-85114T ROLLER BEARING,CRANKSHAFT-UPPER
11 26-859741 OIL SEAL,CRANKSHAFT-UPPER
12 86992A5 BEARING ASSEMBLY,CENTER MAIN
13 28-20094 KEY,FLYWHEEL DRIVE
14 767-9104A3 PISTON AND PIN ASSEMBLY
15 40-828119 LOCK RING,PISTON PIN
16 39-8M0083677 PISTON RING ASSUMBLY
17 630-8835A4 CONNECTING ROD ASSEMBLY
18 29-98295 NEEDLE BEARING,PISTON END
19 12-8M0012294 BEARING,LOCATING-NEEDLE BEARING
20 31-879877A1 ROLLER BEARING ASSEMBLY
21 10-4008225 SCREW,CONNECTING ROD(25MM)
▶CYLINDER BLOCK AND COVERS (39 parts) CYLINDER BLOCK AND COVERS
Ref OEM Part # Part Name
1 872-9533T38 BLOCK/CRANKCASE ASSYEMBLY
2 17-85171 DOWEL PIN,CYLINDER BLOCK
3 22-15133 ELBOW,BLEED HOSE(45)
4 32-892024122 HOSE,BLEED(12-1/4")
5 16-429173 STUD,CARBURETOR
6 10-40001209 SCREW,CRANKCASE TO CYLINDER BLOCK (60MM)
7 27-892158 GASKET,EXHAUST MANIFOLD
8 92329 EXHAUST MANIFOLD
9 27-414991 GASKET,EXHAUST COVER
10 92330T COVER,EXHAUST
11 10-4000333 SCREW,EXHAUST COVER TO CYLINDER BLOCK (40MM)
12 144071 COVER,TRANSFER PORT
13 25-822370 "O" RING,TRANSFER PORT COVER
14 10-40057107 SCREW,COVER TO CYLINDER BLOCK(16MM)
15 1028-8283A1 COVER ASSEMBLY,CYLINDER BLOCK
16 10-4000331 SCREW,COVER ATTACHING (30MM)
17 27-86389 GASKET,CYLINDER BLOCK COVER
18 22-996642 ELBOW,TELL TALE HOSE
19 32-8M0108355 HOSE,TELL TALE (8")
20 22-94848 FITTING,TELL TALE HOSE-BOTTOM COWL
21 14406 COVER,TRANSFER PORT
22 25-86391 "O" RING,TRANSFER PORT COVER
23 10-40057107 SCREW,COVER TO CYLINDER BLOCK (16MM)
24 92350 COVER,TRANSFER PORT
25 25-8M0214925 "O" RING,TRANSFER PORT COVER
26 10-40057107 SCREW,COVER TO CYLINDER BLOCK(16MM)
27 14112T REED BLOCK
28 85977002 SEAL,REED BLOCK-RUBBER
29 27-414172 GASKET,REED BLOCK
30 34-816806 REED
31 34-897931 REED STOP
32 10-4005785 SCREW,REED ATTACHING (10MM)
33 27-414181 GASKET,ADAPTOR PLATE
34 41420A3 PLATE,ADAPTOR-CARBURETOR
35 22-56759 FITTING,ADAPTOR PLATE-BLEED HOSE
36 10-40019108 SCREW,PLATE TO REED BLOCK(20MM)
37 11-400213 NUT,CARBURETOR STUD
38 43717 IDLE STOP
39 10-40019108 SCREW,IDLE STOP
▶DRIVE SHAFT HOUSING ASSEMBLY (12 parts) DRIVE SHAFT HOUSING ASSEMBLY
Ref OEM Part # Part Name
1 99702A7 ADAPTOR PLATE ASSEMBLY (MERC 25)
2 96248A1 HOUSING ASSEMBLY,WATER TUBE
3 26-25329 SEAL,WATER TUBE
4 23-889715 SPACER,WATER TUBE
5 10-400035 SCREW,HOUSING TO ADAPTOR PLATE(16MM)
6 27-41670006 GASKET,ADAPTOR PLATE
7 158662 SEAL,ADAPTOR PLATE
11 32-86292 WATER TUBE,LONG SHAFT
12 1591-8749A1 HOUSING ASSEMBLY,LONG SHAFT
13 27-433374 GASKET,DRIVE SHAFT HOUSING
14 10-1993870 SCREW,DRIVE SHAFT HOUSING TO PLATE(60MM)
15 12-4002317 WASHER,DRIVE SHAFT HOUSING SCREW
▶ELECTRIC COMPONENTS (26 parts) ELECTRIC COMPONENTS
Ref OEM Part # Part Name
1 8M0058226 RECTIFIER ASSEMBLY
2 10-48409 SCREW,RECTIFIER TO CYLINDER BLOCK
3 11-45076 NUT,RECTIFIER TERMINALS
4 89-8M0185149 STARTER SOLENOID
5 10-4000327 SCREW,STARTER SOLENOID TO CRANKCASE(14MM)
6 11-26419 NUT,STARTER SOLENOID TERMINAL(10-32)
7 11-64015 NUT,STARTER SOLENOID TERMINAL(1/4-20)
8 84-88809A5 WIRE ASSEMBLY,YELLOW
9 84-88439A28 BATTERY WIRE ASSEMBLY,BLACK
10 84-92436A5 WIRING HARNESS ASSEMBLY,ENGINE
11 88-95085 FUSE
12 92439 BRACKET,WIRING HARNESS
13 10-4000327 SCREW,BRACKET
14 11-400212 NUT,BRACKET SCREW
15 54-815504310 CLAMP,WIRING HARNESS
16 54-8M0024808 CLAMP,WIRING HARNESS
17 86704A10 STATOR ASSEMBLY,AUXILIARY
18 10-4000123 SCREW,STATOR ATTACHING(30MM)
19 50-8M0033984 STARTER MOTOR ASSEMBLY
20 96561 DRIVER KIT
21 96562 DRIVE
22 96563T DRIVE
23 96563T ARMATURE
24 96564T END CAP,COMMUTATOR W/SPRINGS AND BRUSHES
25 10-96566 THRU BOLT
26 10-4000358 SCREW,STARTER MOTOR ATTACHING
▶FUEL FILTER ASSEMBLY (15 parts) FUEL FILTER ASSEMBLY
Ref OEM Part # Part Name
1 35-889527A07 FUEL FILTER ASSEMBLY
2 35-87946Q04 FILTER ASSEMBLY
3 25-897536 SEAL,FUEL FILTER
4 858731 BALL,FUEL FILTER
5 32-8M0108355 FUEL LINE,FILTER TO CARBURETOR(5-1/4")
6 32-8M0108355 FUEL LINE,FILTER TO ADAPTOR (81/2")
7 54-68424 CLAMP,FUEL LINE
8 22-98750 FITTING,FUEL LINE
9 30188 CUP WASHER,ADAPTOR
10 24-23067T SPRING,ADAPTOR STEM
11 25-16524 "O" RING,ADAPTOR STEM
12 23069 STEM,ADAPTOR
13 22833 ADAPTOR,CHECK UNIT
14 10-4000332 SCREW,ADAPTOR TO BOTTOM COWL(35MM)
15 11-401386 NUT,ADAPTOR SCREW
▶GEAR HOUSING (DRIVE SHAFT) (39 parts) GEAR HOUSING (DRIVE SHAFT)
Ref OEM Part # Part Name
- 1665-8669T14 GEAR HOUSING ASSEMBLY,COMPLETE-LONG SHAFT
1 1600-8M0083538 GEAR HOUSING ASSEMBLY
2 35-41133 SCREEN,WATER INLET-PORT
3 10-40031112 SCREW,SCREEN TO GEAR HOUSING(40MM)
4 11-400263 NUT,SCREEN SCREW
5 31-41326 ROLLER BEARING,UPPER
6 26-99325 SEAL,GEAR HOUSING
7 17-8M0084726 DOWEL PIN,GEAR HOUSING
8 31-98294A1 ROLLER BEARING ASSEMBLY
9 43-98302 PINION GEAR
10 10-49908 SCREW,PINION GEAR
11 45-99198 DRIVE SHAFT-LONG SHAFT
12 25-99691 "O" RING
13 22-8M0058389 SCREW,DRAIN-MAGNETIC
14 10-79953Q04 SCREW,GREASE FILLER
15 12-191833 WASHER,DRAIN AND FILLER SCREW
16 85562A1 CAM ASSEMBLY,SHIFT
17 17-85096 DRIVE PIN,SHIFT CAM
18 17-85593 ROLL PIN,SHIFT SHAFT
19 12-8M0204649 WASHER,SHIFT SHAFT
20 24-93007 SPRING,SHIFT SHAFT
21 12-85091 WASHER,SHIFT SHAFT
22 25-85594 "O" RING,SHIFT SHAFT
23 25-35276 "O" RING,SHIFT SHAFT RETAINER
24 93878 RETAINER,SHIFT SHAFT
25 85552001 BOOT,SHIFT SHAFT
26 86293 SHIFT SHAFT-LONG SHAFT
27 27-993261 GASKET,WATER PUMP
28 85083 FACE PLATE
29 12-8M0204722 WASHER,IMPELLER
30 28-8M0214993 KEY,IMPELLER DRIVE
31 47-8M0204712 IMPELLER
32 25-69202 "O" RING,WATER PUMP
33 46-99157A02 WATER PUMP ASSEMBLY
34 10-400035 SCREW,WATER PUMP TO FEAR HOUSING (16MM)
35 12-89302 WASHER,WATER PUMP SCREW
36 23-8M0214959 BUSHING,WATER PUMP SCREW
37 26-85090001 SEAL,WATER TUBE
38 25-86203 RING,DRIVE SHAFT-RUBBER
▶GEAR HOUSING (PROPELLER SHAFT) (28 parts) GEAR HOUSING (PROPELLER SHAFT)
Ref OEM Part # Part Name
- 1665-8669T14 GEAR HOUSING ASSEMBLY,COMPLETE-LONG SHAFT
1 1600-8M0083538 GEAR HOUSING ASSEMBLY
39 97-98432Q6 TRIM TAB
40 10-4000355 SCREW,TRIM TAB(35MM)
41 12-8M0042642 WASHER,TRIM TAB SCREW
42 31-8M0103470 ROLLER BEARING ASSEMBLY,TAPERED
43 43-44213T1 FORWARD GEAR
44 23-85557 BUSHING,FORWARD GEAR
45 85094 CAM FOLLOWER
46 24-38114 SPRING,RETAINING-CROSS PIN
47 52-41040T CLUTCH,SLIDING
48 17-8M0020999 CROSS PIN,CLUTCH TO PROPELLER SHAFT
49 24-88680 SPRING,COMPRESSION-PROPELLER SHAFT
50 44-8166231 PROPELLER SHAFT
51 43-99542T REVERSE GEAR
52 99906T1 BEARING CARRIER ASSEMBLY
53 31-21739 ROLLER BEARING
54 26-41132 OIL SEAL,BEARING CARRIER(INNER)
55 26-41131 OIL SEAL,BEARING CARRIER(OUTER)
56 25-85549 "O" RING,BEARING CARRIER
57 87293 PLATE,GEAR HOUSING
58 10-90883 SCREW,COVER TO GEAR HOUSING(16MM)
59 858498 THRUST HUB ASSEMBLY,PROPELLER
60 48-19640A40 PROPELLER ASSEMBLY
61 11-88228 PROPELLER NUT
62 10-87810178 SCREW,GEAR HOUSING(25MM)
63 12-43328 WASHER,GEAR HOUSING SCREW
64 23-41589 SPACER,GEAR HOUSING SCREW
▶IGNITION COMPONENTS (22 parts) IGNITION COMPONENTS
Ref OEM Part # Part Name
1 84-88891A1 HARNESS ASSEMBLY,PRIMARY
2 86617A20 STATOR ASSEMBLY
3 10-400015 SCREW,STATOR ATTACHING (10MM)- MANUAL
4 54-24836 CLIP,STATOR LEADS
5 10-40019108 SCREW,CLIP TO SWITCH BOX(20MM)
6 98450A10 TRIGGER ASSEMBLY
7 54-24836 CLIP,TRIGGER LEADS
8 10-77137 SCRWE,CLIP TO CRANKCASE
9 8M0084613 "C" WASHER,CLIP SCREW
10 339-832757A4 IGNITION COIL ASSEMBLY
11 10-4000189 SCREW, COIL TO CYLINDER BLOCK (45MM)
12 88173 TAB,COIL SCREW
13 11-45076 NUT,COIL TERMINAL
14 84-813715A1 LEAD ASSEMBLY, HIGH TENSION
15 85-92308 BOOT,COIL
16 85-63709A1 BOOT ASSEMBLY,SPARK PLUG
17 33-896329828 SPARK PLUG,SHAMPION #QL-77J4-CANADA AND BELGIUM
18 339-7452A3 SWITCH BOX ASSEMBLY
19 10-40019108 SCREW,SWITCH BOX CYLINDER BLOCK(22MM)
20 11-45076 NUT,SWITCH BOX TERMINALS
21 23-88171 BUSHING,COIL SCREW
22 13-69432 LOCKWASHER,GROUND
▶MISCELLANEOUS PARTS/ACCESSORIES (1 parts) MISCELLANEOUS PARTS/ACCESSORIES
Ref OEM Part # Part Name
- 90-99917 OWNERS GUIDE
▶STARTER ASSEMBLY,MANUAL (24 parts) STARTER ASSEMBLY,MANUAL
Ref OEM Part # Part Name
1 86689A5 HOUSING,STARTER
2 86971 COVER,STARTER HOUSING
3 858925 LEVER,LOCK (UPPER)
4 24-12734 SPRING,UPPER LOCK LEVER
5 93876T02 LEVER,LOCK (LOWER)
6 10-61802 SCREW,LOWER LOCK LEVER
7 17-38489 ROLL PIN, LOCK LEVER
8 10-4000183 SCREW,STARTER HOUSING ATTACHING (35MM)
9 833161T PAD,FELT
10 24-86857T01 SPRING,STARTER
11 50-825269T01 SHEAVE.STARTER
12 24-86851T02 SPRING,CAM
13 868501 CAM
14 53-86849T01 RETAINING RING,CAM
15 50-12066Q10 ROPE,STARTER
16 85174A1 HANDLE ASSEBLY,STARTER ROPE
17 24-868523 SPRING,CAM
18 86853T01 CAM
19 10-826253 SCREW,CAM TO STARTER SHEAVE
20 426264 SUPPORT,STARTER HANDLE
21 10-40019111 SCREW,SUPPORT TO STARTER HOUSING (35MM)
22 12-4002313 WASHER,SUPPORT SCREW
23 23-309772 SPACER,SUPPORT SCREW
24 11-401385 NUT,SUPPORT SCREW
▶STEERING HANDLE ASSEMBLY (18 parts) STEERING HANDLE ASSEMBLY
Ref OEM Part # Part Name
- 94185A16 STEERING HANDLE ASSEMBLY
1 8M0221732 GRIP,RUBBER
2 84-89591A5 HARNESS ASSEMBLY,STOP SWITCH
3 11099A1 BOOT ASSEMBLY,STOP SWITCH
4 87-823609A10 HANDLE ASSEMBLY,THROTTLE
5 37-13239 DECAL,THROTTLE HANDLE
6 10-62568 SCREW,THROTTLE HANDLE
7 99333A2 TUBE ASSEMBLY,STEERING
8 975501 TUBE ASSEMBLY
9 44397A6 BRACKET ASSEMBLY
10 10-4005688 SCREW,BRACKET CLAMPING(20MM)
11 12-57860 WASHER,NYLON-BRACKET
12 11-859133 NUT,BRACKET
13 23-85973 BUSHING,BRACKET
14 43242 CABLE,THROTTLE
15 11-400212 NUT,THROTTLE CABLE
16 43447A3 BRACKET ASSEMBLY,STEERING
17 10-4000384 SCREW,BRACKET TO SWIVEL TUBE(75MM)
▶SWIVEL BRACKET ASSEMBLY (26 parts) SWIVEL BRACKET ASSEMBLY
Ref OEM Part # Part Name
1 97544A5 SWIVEL TUBE ASSEMBLY
2 10-125161 SCREW,UPPER MOUNT(133MM)
3 14894 MOUNT,UPPER
4 12-85172 WASHER,RUBBER-UPPER MOUNT SCREW
5 12-85106 WASHER,UPPER MOUNT SCREW
6 11-400213 NUT,UPPER MOUNT SCREW
7 85157 ROD,REVERSE HOOK
8 85173 PLATE,PILOT CONTROL
9 12-85104 WASHER,SWIVEL TUBE
10 3415-822237A1 SWIVEL BRACKET ASSEMBLY
11 22-8M0169589 GREASE FITTING
12 23-95949 BUSHING,SWIVEL BRACKET
13 10-91807 SCREW,PILOT CONTROL
14 24-96203 SPRING,PILOT CONTROL SCREW
15 25-86993 "O" RING SWIVEL TUBE
16 23-85154 BUSHING,SWIVEL TUBE(LOWER)
17 98830A2 HOOK ASSEMBLY,REVERSE LOCK
18 24-96018 SPRING,REVERSE HOOK-PORT
19 24-97427 SPRING,REVERSE HOOK-STARBOARD
20 85122001 MOUNT,LOWER
21 85123001 BUMPER,FRONT
22 95068A1 COVER,LOWER MOUNT
23 10-1994360 SCREW,LOWRE MOUNT COVER(60MM)
24 10-19943100 SCREW,LOWER MOUNT COVER(100MM)
25 11-400213 NUT,LOWER MOUNT COVER SCREW
26 12-36001 WASHER,LOWER MOUNT COVER SCREW
▶THROTTLE AND SHIFT LINKAGE (ELECTRIC) (47 parts) THROTTLE AND SHIFT LINKAGE (ELECTRIC)
Ref OEM Part # Part Name
1 17764A2 THROTTLE CAM
2 10-400035 SCREW,THROTTLE CAM TO CRANKCASE(16MM)
3 12-87791 WASHER,THROTTLE CAM SCREW
4 13-69150 WAVE WASHER,THROTTLE CAM SCREW
5 17764A2 BUSHING,THROTTLE CAM SCREW
6 92425 DASHPOT
7 93001 BRACKET,DASHPOT
8 11-22053 NUT,DASHPOT TERMINAL
9 98463A2 THROTTLE ROD
10 11-68219 NUT,LOCK-THROTTLE ROD
11 8M0084742 SOCKET,THROTTLE ROD
12 92730 LEVER,CONTROL
13 817429 TIMING ROD
14 44299 PLATFORM,CONTROL
15 24-89540 SPRING,SPARK ADVANCE
16 95034 LEVER,ACTUATING
17 53-46250 RETAINING RING,ACTUATING AND CONTROL LEVER
18 10-40019108 SCREW,CONTROL PLATFORM(20MM)
19 10-40037126 SCREW,CONTROL PLATFORM(13MM)
20 10-40007128 SCREW,SHIFT LEVER TO PLATFORM(20MM)
21 12-95093 WASHERMSHIFT LEVER TO PLATFORM
22 95035 LEVER,SHIFT
23 23-95091 SLEEVE,SHIFT LEVER TO PLATFORM
24 12-35280 WASHER,SHIFT LEVER SCREW
25 11-401386 NUT,SHIFT LEVER SCREW
26 17-95029 PIN,SHIFT LEVER
27 12-71055 WASHER,SHIFT LEVER PIN
28 398-2171 COTTER PIN,SHIFT LEVER PIN
29 17-95784 PIN,ACTUATING LEVER
30 12-71055 WASHER,ACTUATING LEVER PIN
31 18-210711 COTTER PIN,ACTUATING LEVER PIN
32 95025 SHIFT LINK
33 23-96202 BUSHING,NYLON-SHIFT LINK
34 12-89302 WASHER,SHIFT LINK
35 398-2171 COTTER PIN,SHIFT LINK
36 95027A6 SHIFT SHAFT ASSEMBLY,HORIZONTAL
37 95023 LEVER,SHIFT SHAFT
38 53-95019 RETAINING RING,LEVER TO SHIFT SHAFT
39 23-60762 BUSHING,SHIFT SHAFT
40 17724A1 LEVER,SHIFT SHAFT
41 11-401385 NUT,SHIFT SHAFT
42 95033 BRACKET,REMOTE CONTROL
43 10-4000327 SCREW,REMOTE CONTROL BRACKET(14MM)
44 18-210711 COTTER PIN,REMOTE CONTROL CABLES
45 96186A2 BRACKET ASSEMBLY,ATTACHING
46 96201 STRAP
47 10-1993325 SCREW,BRACKET (25MM)
▶THROTTLE AND SHIFT LINKAGE (MANUAL) (40 parts) THROTTLE AND SHIFT LINKAGE (MANUAL)
Ref OEM Part # Part Name
1 17764A2 THROTTLE CAM
2 10-400035 SCREW,THROTTLE CAM TO CRANKCASE (16MM)
3 12-87791 WASHER,THROTTLE CAM SCREW
4 13-69150 WAVE WASHER,THROTTLE CAM SCREW
5 17764A2 BUSHING,THROTTLE CAM SCREW
6 92425 DASHPOT
7 93001 BRACKET,DASHPOT
8 11-22053 NUT,DASHPOT TERMINAL
9 98463A2 THROTTLE ROD
10 11-68219 NUT,LOCK-THROTTLE ROD
11 8M0084742 SOCKET,THROTTLE ROD
12 433601 LEVER,CONTROL
13 817429 TIMING ROD
14 11-68219 NUT,LOCK-TIMING ROD
15 8M0084742 SOCKET,TIMING ROD
16 44299 PLATFORM,CONTROL
17 24-89540 SPRING,SPARK ADVANCE
18 92362A1 LEVER,ACTUATING
19 53-46250 RETAINING RING,ACTUATING AND CONTROL LEVER
20 92362A1 LINK,THROTTLE/ADVANCE
21 53-86731 RETAINING RING,THROTTLE/ADVANCE LINK
22 94152 GEAR
23 92362A1 LEVER,PRIMARY
24 53-46250 RETAINING RING,PRIMARY LEVER AND GEAR
25 24-8M0215005 SPRING,DETENT BALL
26 30-93008 BALL,DETENT
27 94085A1 GEAR,SHIFT
28 12-49339 WASHER,SHIFT GEAR
29 53-46250 RETAINING RING,SHIFT GEAR
30 193852 SHIFT ROD
31 94084 LEVER,SHIFT ROD
32 10-4001589 SCREW,SHIFT ROD LEVER
33 23-60762 BUSHING,SHIFT SHAFT
34 87794 SHIFT SHAFT,HORIZONTAL
35 93744 LEVER,SHIFT SHAFT
36 93928 LEVER,ROD END
37 10-4001588 SCREW,ROD END LEVER
38 94186 BRACKET,THROTTLE CABLE
39 10-4000171 SCREW,BRACKET TO CYLINDER BLOCK (16MM)
40 10-76502 SCREW,IDLE STOP-CONTROL LEVER

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 25 running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

  1. Replace water pump impeller and inspect wear plate
  2. Change engine oil and oil filter (check drain plug washer)
  3. Replace spark plugs and check ignition timing
  4. Drain and refill lower unit gear oil; inspect for water contamination
  5. Inspect fuel lines, primer bulb, and fuel filter for deterioration
  6. Check and replace sacrificial anodes (zinc or aluminum)
  7. Inspect propeller for damage; check shaft seal and cotter pin
  8. Check valve clearance (refer to service manual for specifications)
  9. Lubricate all grease points (steering, tilt tube, shift linkage)
  10. 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.

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