Mercury 25 (2 CYL.) (International) (0N018456 THRU 0N055504) Parts & Diagrams

OEM and aftermarket replacement parts for Mercury 25 (2 CYL.) (International). Scroll down for exploded parts diagrams (27), specifications, and maintenance reference.

Mercury 25 (2 CYL.) (International) (0N018456 THRU 0N055504) Parts & Diagrams

🔎 Mercury 25 (2 CYL.) (International) Reference Library — Exploded parts diagrams (27 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 25 (2 CYL.) (International) 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 (2 CYL.) (International):

  • 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 (2 CYL.) (International).

Accessories (21 parts) Accessories
Ref OEM Part # Part Name
- 832586A3 TILLER HANDLE KIT Comment: (Gray) SN# 0N576838 & Up
1 91-953992 TOOL KIT
2 50-812639003 ROPE
3 16841Q02 FLUSHING PLUG
4 853824A1 DRAG LINK ASSEMBLY
5 853825 CAP
6 23-853826 SPACER
7 853827A02 LOCK KIT, Reverse
8 79-804632T01 TEMPERATURE GAUGE, Water
9 88-804634 BULB
10 802613 DAMPER
11 804635 BRACKET
12 11-802617 NUT
13 13-168181 LOCKWASHER
14 804636 SENSOR, Water Temperature
15 84-804637 LEAD WIRE
16 84-17175 HARNESS ASSEMBLY
17 25-162313 GROMMET
18 8M0123939 RECTIFIER KIT
19 48-8537906 TEST PROPELLER
20 8538281 HANDLE, (1.0 Meters) (1.0M)
Carburetor (38 parts) Carburetor
Ref OEM Part # Part Name
- 27-8M0119225 GASKET SET, Powerhead
1 3303-853720A8 CARBURETOR
2 10-16263 SCREW
3 24-16264 SPRING
4 10-8129351 SCREW, Pilot Adjust
5 24-162661 SPRING
6 952683 LEVER, Throttle
7 853788 ROLLER
8 13-853723 LOCKWASHER
9 11-853722 NUT
10 10-162571 SCREW
11 16254A6 FLOAT NEEDLE
12 853721 PIN, Valve
13 54-16255 CLIP
14 85,162511 JET, Pilot
15 16252 CAP
16 8126501 MAIN NOZZLE
17 155,162501 JET, Main
18 162531 FLOAT
19 17-16256 PIN
20 25-162591 O-RING
21 162582 FLOAT BOWL
22 10-162611 SCREW, Drain
23 25-8537092 O-RING
24 10-162601 SCREW
25 16333 SNAP, Link Rod
26 8M0170572 ROD, Choke Link
27 8537281 COVER
28 10-82304223 BOLT
29 853726 BRACKET, Choke Lever
30 853725 LEVER, Choke
31 10-16223 BOLT, (M6 x 14)
32 13-8537231 WAVE WASHER
33 11-8537221 NUT
34 10-8230427 BOLT
35 853724001 KNOB, Choke
36 18-8150261 COTTER PIN
37 25-8537093 BUSHING
Clamp Bracket (40 parts) Clamp Bracket
Ref OEM Part # Part Name
1 3406-9622T02 CLAMP BRACKET, Starboard, Black, 1/2 Inch Thread
2 3406-9623T02 CLAMP BRACKET, Port, Black, 1/2 Inch Thread
3 12-95379 PAD
4 11-85372214 CAP NUT
5 898101191 TILT TUBE
6 11-853722029 NUT
7 898101207 PIN, Tilt
8 24-8126455 SPRING
9 10-16200A1 THUMB SCREW ASSEMBLY, 1/2 Inch Thread Size
10 10-167051 BOLT, (M6 x 20)
11 97-823913Q ANODE
12 11-400212 NUT, (M6) Stainless Steel
13 13-400256 LOCKWASHER, (M6)
14 12-16826 WASHER, Stainless Steel
15 898101044 PIN, Spacer
16 10-8230426 BOLT
17 879194006 SET PLATE
18 8M0157131 STOPPER, Tilt Comment: SN# 0N038482 & Up
19 17-9521810 PIN, Roll
20 8251131 BRACKET
21 853774 STOP
22 24-953832 SPRING
23 162132 ARM, Reverse Lock
24 10-879194007 SCREW Comment: SN# 0N026640 & Up
25 12-953921 WASHER, Stainless Steel
26 24-879194008 SPRING Comment: (Long/X-Long/XX-Long) SN# 0N021907 & Up
27 162131 ARM, Reverse Lock
28 8537474 ROD, Reverse Lock
29 18-8150261 COTTER PIN
30 24-953833 SPRING
31 8537475 LINK, Reverse Lock
32 853759T01 LEVER, Reverse Lock
33 10-162612 BOLT
34 13-17641 WAVE WASHER
35 12-953921 WASHER, Stainless Steel
36 8M0183798 GRIP
37 8M0051399 BUTTON
38 10-879194310 BOLT
39 12-16192 WASHER
40 11-400212 NUT, (M6) Stainless Steel
Cowling (28 parts) Cowling
Ref OEM Part # Part Name
1 2189-8M0063888 TOP COWL ASSEMBLY, Black - Un Decaled
2 8107511 SEAL
3 8M0071849 INLET, Air Comment: (Silver)
4 11-400212 NUT, (M6) Stainless Steel
5 13-400256 LOCKWASHER, (M6)
6 12-95392 WASHER
7 25-162281 SEAL, Rubber
8 37-858841A02 DECAL SET Comment: (Mariner 25 Marathon)
9 100-8M0149928 BOTTOM COWL Comment: (Black)
10 25-8537095 GROMMET
11 25-162312 GROMMET
12 25-162261 GROMMET
13 25-162311 GROMMET
14 10-16223 BOLT, (M6 x 14)
15 13-400256 LOCKWASHER, (M6)
16 12-953921 WASHER, Stainless Steel
17 162221 HOOK
18 13-16221 WAVE WASHER
19 12-953922 WASHER
20 23-8M0075210 BUSHING
21 26-162191 SEAL
22 162186 HOOK LEVER Comment: (Black)
23 22-898101961 NIPPLE
24 10-16830 BOLT
25 13-400256 LOCKWASHER, (M6)
26 12-161404 WASHER
27 23-853715007 SPACER
28 23-8537437 MOUNT, Rubber
Crankshaft, Pistons and Connecting Rod (23 parts) Crankshaft, Pistons and Connecting Rod
Ref OEM Part # Part Name
- 853787A07 POWERHEAD ASSEMBLY Comment: SN# 0N046082 & Up
1 474-803672A07 CRANKSHAFT ASSEMBLY Comment: SN# 0N046082 & Up
2 463-813044A01 CRANKSHAFT Comment: SN# 0N046082 & Up
3 813046T01 PIN, Crank
4 629-813047T01 CONNECTING ROD
5 31-8130482 BEARING, Needle
6 463-8M0090847 CRANKSHAFT
7 30-16049T02 BEARING, Ball
8 26-853707A1 SEAL KIT
9 17-161791 PIN
10 463-8M0090848 CRANKSHAFT
11 463-813045T01 CRANKSHAFT
12 53-160571 CLIP
13 41-803680003 PIN, Piston
14 96161 PISTON Comment: (.5mm Oversize)
15 39-16055A4 RING SET, Piston Comment: (.5mm Oversize)
16 31-8130483 BEARING, Needle
17 30-8M0119217 BEARING, Ball
18 28-160531 KEY
19 53-853714 C CLIP
20 30-16049T02 BEARING, Ball
21 15-853716 SHIM
22 23-853715 SPACER
Cylinder Block (39 parts) Cylinder Block
Ref OEM Part # Part Name
- 853787A07 POWERHEAD ASSEMBLY Comment: SN# 0N046082 & Up
1 800-8M0190577 CYLINDER BLOCK
2 22-8129602 FITTING
3 17-9521814 PIN, Dowel
4 10-166951 BOLT
5 10-8M0106721 BOLT
6 12-4002217 WASHER
7 22-812960006 NIPPLE Comment: SN# 0N009357 & Up
8 22-8M0064617 CONNECTOR Comment: SN# 0N009357 & Up
9 54-95224 CLIP
10 32-898101272 HOSE, Rubber with Arrow (730mm) Comment: SN# 0N009357 & Up
11 25-853709 O-RING
12 26-853707 SEAL, Oil - Upper
13 1100-853708 END CAP, Upper
14 853710 SET RING
15 853711 GUIDE PLATE
16 10-168283 BOLT, (M6 x 20)
17 979-9630T02 CYLINDER HEAD
18 27-8M0119224 GASKET
19 10-168282 BOLT
20 853705A01 COVER
21 27-8M0214960 GASKET
22 8M0228409 THERMOSTAT
23 33-8M0181925 SPARK PLUG, (NGK# BR7HS-10) Comment: (NGK-BR7HS-10)
24 10-8M0106720 BOLT
25 12-8M0106725 WASHER
26 10-16832 BOLT, (M6 x 16)
27 97-823913Q ANODE
28 32-8M0057113 LINE, Fuel (250 mm)
29 853706 COVER, Exhaust
30 27-812939018 GASKET
31 10-898103A79 BOLT AND LOCKWASHER, Electroplated (M5 x 18)
32 853712 THRUST RING
33 26-8537071 SEAL, Oil - Lower
34 26-8537072 SEAL, Oil
35 25-8537091 O-RING
36 1100-853713T END CAP, Lower
37 10-16832 BOLT, (M6 x 16)
38 13-400256 LOCKWASHER, (M6)
Drive Shaft Housing (45 parts) Drive Shaft Housing
Ref OEM Part # Part Name
- 853787A07 POWERHEAD ASSEMBLY Comment: SN# 0N046082 & Up
1 1500-8M0065999 HOUSING, Driveshaft Comment: (Long-Black)
2 10-8230423 BOLT
3 12-8M0135942 WASHER
4 10-8129354 BOLT
5 12-161405 WASHER
6 12-161407 WASHER
7 8M0074132 MOUNT, Lower
8 12-168261 WASHER
9 10-8230426 BOLT
10 853772005 RETAINER
11 10-812935008 BOLT
12 12-161406 WASHER
13 8M0074133 MOUNT, Upper
14 853773 BUMPER
15 10-879194308 BOLT Comment: (For 125mm Spacer Only)
16 12-8M0135942 WASHER
17 853986 SEAL
18 19-879194296 PLUG, Water
19 27-95220 GASKET
20 17-16119 PIN, Dowel
21 27-853987001 GASKET
22 853768 SHIFT ROD JOINT Comment: (Included With Complete Gear Housing Replacement)
23 17-952189 PIN, Dowel Comment: (Included With Complete Gear Housing Replacement)
24 25-8537094 GROMMET
25 161862 SHIFT ROD
26 813027008 LEVER, Shift
27 23-8537153 SPACER
28 26-8537075 SEAL, Oil
29 23-8537434 BUSHING
30 161842 LEVER, Shift Rod
31 11-85372212 NUT, Nylon
32 15-853795 SHIM
33 853767 BRACKET
34 10-16832 BOLT, (M6 x 16)
35 12-16826 WASHER, Stainless Steel
36 24-8130281 SPRING
37 30-812937 STOPPER
38 853766 PLATE, Stopper
39 10-898101354 SCREW
40 32-161703 TUBE, Water Comment: (XX-Long)
41 8107531 LOCK PLATE
42 10-162231 BOLT
43 26-161711 SEAL
44 26-8537074 SEAL
Drive Shaft Housing Extension Kits (13 parts) Drive Shaft Housing Extension Kits
Ref OEM Part # Part Name
1 853783T01 EXTENSION KIT Comment: (X-Long-Black - 3 Inches)
2 853784T01 EXTENSION KIT Comment: (XX-Long-Black - 5 Inches)
3 16-853789 STUD Comment: (X-Long)
4 16-853789003 STUD Comment: (X-Long)
5 12-8M0135942 WASHER Comment: (X-Long)
6 11-400213 NUT, (M8) Stainless Steel Comment: (X-Long)
7 10-16126 BOLT Comment: (X-Long)
8 10-879194308 BOLT Comment: (X-Long)
9 12-8M0135942 WASHER Comment: (X-Long)
10 32-161703 TUBE, Water Comment: (XX-Long)
11 161744 CAM ROD Comment: (XX-Long)
12 853794 RETAINER Comment: (XX-Long)
13 45-161364 DRIVESHAFT Comment: (XX-Long)
Electric Starter Components (39 parts) Electric Starter Components
Ref OEM Part # Part Name
- 50-853805T04 STARTER MOTOR KIT, Electric
1 50-853805T01 STARTER MOTOR ASSEMBLY
2 853806 DRIVE KIT
3 853807 BRUSH (Positive)
4 8538071 BRUSH (Negative)
5 853808 HOLDER, Brush
6 10-16126 BOLT
7 13-400256 LOCKWASHER, (M6)
8 11-400213 NUT, (M8) Stainless Steel
9 853819 RUBBER
10 84-8M0069818 CABLE ASSEMBLY, Starter
11 85-8538161 CAP
12 89-853809T SOLENOID, Starter
13 11-400212 NUT, (M6) Stainless Steel
14 13-400256 LOCKWASHER, (M6)
15 10-16832 BOLT, (M6 x 16)
16 8M0103003 PLATE, Electrical Mounting
17 8M0103004 BRACKET
18 10-953964 BOLT
19 10-16705 BOLT
20 54-813275 CLAMP
21 11-16081 NUT, Stainless Steel
22 13-16079 LOCKWASHER
23 10-953963 BOLT
24 8538116 RECTIFIER
25 84-803820 GROUND WIRE
26 10-16123 SCREW, (25 mm)
27 23-9528611 COLLAR
28 13-400256 LOCKWASHER, (M6)
29 11-400212 NUT, (M6) Stainless Steel
30 86-853812 TERMINAL BLOCK
31 84-853813A1 WIRE ASSEMBLY, Fuse
32 88-853814 FUSE
33 85-853816 CAP
34 84-853815 WIRE, Battery
35 10-16223 BOLT, (M6 x 14)
36 84-8537402 GROUND WIRE
37 54-816311T TIE STRAP, (8.00 Inches)
38 853818 SPIRAL RAP
Electric Starter Optional Parts (16 parts) Electric Starter Optional Parts
Ref OEM Part # Part Name
- 50-853805T04 STARTER MOTOR KIT, Electric
1 853829A1 SOLENOID ASSEMBLY, Choke (Electric Remote)
2 853830 PLUNGER (Electric Remote)
3 853831 HOOK (Electric Remote)
4 17-952189 PIN, Dowel (Electric Remote)
5 853832001 ROD, Choke Shaft (Electric Remote)
6 11-85372216 NUT (Electric Remote)
7 10-162454 SCREW (Electric Remote)
8 54-17169 CLAMP (Electric Remote)
9 10-16827 SCREW (Electric Remote)
10 25-162262 GROMMET (Electric Remote)
11 87-8M0127937 SWITCH ASSEMBLY, Neutral (Electric Tiller)
12 23-803842A1 WASHER (Electric Tiller)
13 853823 PLATE (Electric Tiller)
14 87-853820A1 MAIN SWITCH (Electric Tiller)
15 853821 PROTECTOR (Electric Tiller)
Electrical Components (39 parts) Electrical Components
Ref OEM Part # Part Name
1 262-815024T05 FLYWHEEL Comment: SN# 0N043033 & Up
2 11-851832001 NUT, Gold Comment: SN# 0N046082 & Up
3 12-8537011 WASHER
4 10-8230315 SCREW
5 853737T03 PLATE ASSEMBLY, Coil
6 160743 COIL, Charger
7 10-8230312 SCREW
8 10-8230314 SCREW
9 853738 GUIDE, Wire
10 803702T COIL, Exciter, Exciter
11 10-8230313 SCREW
12 853711 GUIDE PLATE Comment: (Shown as Reference #15 on Cylinder Block)
13 853710 SET RING Comment: (Shown as Reference #14 on Cylinder Block)
14 10-8230315 SCREW
15 54-813275 CLAMP
16 54-953953 CLIP
17 8M0047311 COIL, Ignition Comment: (With Resistance)
18 84-853740 GROUND WIRE
19 10-823042 BOLT
20 23-8537151 SPACER
21 13-400256 LOCKWASHER, (M6)
22 11-400212 NUT, (M6) Stainless Steel
23 853739 PLATE, Electrical Mounting
24 8M0180178 CD UNIT
25 10-8230421 BOLT
26 12-953921 WASHER, Stainless Steel
27 12-953923 WASHER, Rubber (Rubber)
28 23-952868 COLLAR
29 12-953924 WASHER, (Rubber) (Rubber)
30 54-816311T TIE STRAP, (8.00 Inches)
31 853741 CAP
32 87-823037A2 SWITCH ASSEMBLY, Stop Comment: (Electric)
33 10-16828 BOLT Comment: (Electric)
34 87-823037A2 SWITCH ASSEMBLY, Stop - Lanyard
35 823054 LANYARD
36 10-8230316 SCREW
37 54-953952 CLAMP
38 10-168301 BOLT
39 11-400213 NUT
Fuel Pump (27 parts) Fuel Pump
Ref OEM Part # Part Name
- 27-8M0119225 GASKET SET, Powerhead
1 853729A1 PUMP ASSEMBLY, Fuel
2 10-162671 SCREW
3 853730 COVER
4 853731 DIAPHRAGM
5 27-8537031 GASKET
6 11-8537222 NUT
7 10-853698 SCREW
8 853732 CHECK VALVE
9 24-162662 SPRING
10 24-162663 SPRING
11 8537311 DIAPHRAGM SET
12 8537311 GASKET
13 12-8M0135942 WASHER
14 11-400213 NUT
15 35-853733A1 FILTER ASSEMBLY, Fuel
16 853734 SCREEN
17 27-8537023 GASKET
18 853735 CUP
19 54-95395 CLIP, Stainless Steel
20 32-8M0057113 LINE, Fuel (1000 mm)
21 11-17480 NUT
22 22-853736 CONNECTOR, Fuel
23 32-8M0057113 LINE, Fuel (1000 mm)
24 10-162451 SCREW
25 27-8M0084271 GASKET
26 32-8M0057113 LINE, Fuel (1000 mm)
Fuel Tank(Plastic - 6.6 Gallon) (15 parts) Fuel Tank(Plastic - 6.6 Gallon)
Ref OEM Part # Part Name
1 1259-859063A1 TANK ASSEMBLY, Fuel - Plastic 6.6 Gallon
2 823536 GAUGE/CAP ASSEMBLY
3 22-8M0175545 CONNECTOR KIT, Fuel
4 25-823533 O-RING
5 35-823534 SCREEN
6 32-8M0126969 FUEL LINE ASSEMBLY
7 54-853798 CLAMP
8 22-8M0120628 CONNECTOR, Fuel
9 13330Q07 BULB ASSEMBLY, Primer
10 21-13331A3 CHECK VALVE ASSEMBLY (Inlet)
11 21-13331A4 CHECK VALVE ASSEMBLY (Outlet)
12 54-4158210 CLAMP, Nylon (Large)
13 54-41582Q7 CLAMP, Nylon (Small)
14 22-89771Q2 CONNECTOR, (.250-18)
15 54-41582Q7 CLAMP, Nylon
Gear Housing, Driveshaft (41 parts) Gear Housing, Driveshaft
Ref OEM Part # Part Name
- 27-8M0089639 GASKET SET, Lower Unit
1 1668-8M0057242 GEAR HOUSING ASSEMBLY, Basic
2 31-813048006 BEARING, Needle
3 22-8M0229353 SCREW, Drain
4 27-95220 GASKET
5 853763 STRAINER SET, Water
6 10-17635 SCREW
7 11-85372210 NUT
8 16133 STRAINER, Water
9 10-898101959 SCREW
10 853762 TRIM TAB
11 10-167051 BOLT, (M6 x 20)
12 8M0172382 CAM
13 161744 CAM ROD Comment: XX-Long
14 17-16179 PIN
15 23-161762 BUSHING
16 25-161772 O-RING
17 25-161782 O-RING
18 10-8230427 BOLT
19 12-953921 WASHER, Stainless Steel
20 853794 RETAINER Comment: XX-Long
21 11-85372211 NUT
22 43-16138T01 GEAR, Pinion (12 Teeth)
23 24-8126454 SPRING
24 853765T PIPE
25 45-161364 DRIVESHAFT Comment: XX-Long
26 28-161551 KEY
27 30-16128T02 BEARING, Tapered roller
28 15-813276005 SHIM, (0.5)
29 26-161622 SEAL, Oil
30 25-8537096 O-RING
31 17-952188 PIN, Dowel
32 46-8260531 HOUSING, Water Pump
33 27-161602 GASKET
34 161592 WEAR PLATE
35 27-161582 GASKET
36 47-8M0214912 IMPELLER
37 161572 INSERT
38 46-161562 HOUSING, Upper Water Pump
39 10-823042046 BOLT
40 26-161681 SEAL
Gear Housing, Propeller Shaft (29 parts) Gear Housing, Propeller Shaft
Ref OEM Part # Part Name
- 27-8M0089639 GASKET SET, Lower Unit
1 1668-8M0057242 GEAR HOUSING ASSEMBLY, Basic
41 15-8132761 SHIM, (0.15) (0.15)
42 30-16128T01 BEARING, Ball
43 43-8M0183179 GEAR, Forward
44 161521 FOLLOWER, Cam
45 30-161322 BALL, Steel
46 853764003 HOLDER
47 24-8126453 SPRING
48 52-898103030 CLUTCH
49 17-161501 PIN
50 24-176672 SPRING
51 44-19513T01 PROPELLER SHAFT
52 12-161401 WASHER
53 43-812945T02 GEAR, Reverse
54 8M0070880 CARRIER ASSEMBLY, Bearing
55 25-161311 O-RING
56 30-16132T01 BEARING, Ball
57 31-813048T05 BEARING, Needle
58 26-161301 SEAL, Oil
59 10-4000354 SCREW, (M8 x 30)
60 12-8M0135942 WASHER
61 161452 THRUST HUB
62 QA2190R PROPELLER Comment: (8 Inch Pitch)
63 12-161402 WASHER
64 11-161471 PROP NUT
65 18-8150264 COTTER PIN
66 10-879194307 BOLT
67 12-8M0135942 WASHER
Manifold/Reed (12 parts) Manifold/Reed
Ref OEM Part # Part Name
- 853787A07 POWERHEAD ASSEMBLY Comment: SN# 0N046082 & Up
1 8M0130960 MANIFOLD ASSEMBLY, Inlet
2 16-8M0106728 STUD
3 10-168284 BOLT
4 27-853702007 GASKET Comment: (30)
5 13-400256 LOCKWASHER, (M6)
6 11-400212 NUT, (M6) Stainless Steel
7 853719T REED BLOCK ASSEMBLY
8 10-8230311 SCREW
9 13-16818 LOCKWASHER
10 12-809931044 WASHER
11 885193 RESTRICTOR Comment: (25)
Recoil Starter (38 parts) Recoil Starter
Ref OEM Part # Part Name
- 27-8M0119225 GASKET SET, Powerhead
1 812632T01 HOUSING, Starter
2 24-8126451 SPRING, Starter
3 812633T01 REEL
4 24-812634005 SPRING
5 24-8126342 SPRING
6 853753 SHAFT, Starter
7 12-4002217 WASHER
8 13-400256 LOCKWASHER, (M6)
9 10-8M0106739 BOLT
10 53-953181 E RING
11 12-898101937 WASHER
12 812635T01 RATCHET
13 23-8537432 BUSHING
14 17-952187 PIN, Roll
15 11-400213 NUT, (M8) Stainless Steel
16 13-8537233 LOCKWASHER
17 8M0102997 LEVER, Shift Interlock
18 853754 GUIDE
19 10-8M0204707 SCREW, (M6 x 25)
20 13-400256 LOCKWASHER, (M6)
21 161102 PLATE, Seal
22 8126401 HANDLE, Starter Rope
23 25-16109 O-RING
24 50-8126391 ROPE, Starter
25 853755 RETAINER
26 853756 PLATE
27 10-8M0106739 BOLT
28 13-400256 LOCKWASHER, (M6)
29 10-8M0204707 SCREW, (M6 x 25)
30 54-953951 CLAMP
31 13-400256 LOCKWASHER, (M6)
32 10-168284 BOLT
33 812642T01 PULLEY
34 16-8M0106733 STUD
35 853758 BRACKET, Starter
36 12-4002217 WASHER
37 11-8537228 NUT
Remote Control Attaching Kit (39 parts) Remote Control Attaching Kit
Ref OEM Part # Part Name
- 853800T01 ATTACHING KIT, Remote Control
1 853804 CONNECTOR SHIFT KIT
2 12-17029 WASHER
3 10-16705 BOLT
4 13-400256 LOCKWASHER, (M6)
5 8538021 RETAINER, Shift Cable
6 11-400212 NUT, (M6) Stainless Steel
7 10-8230428 BOLT
8 8538022 PLATE, Steering Hook
9 12-16192 WASHER
10 11-400213 NUT, (M8) Stainless Steel
11 10-898103A79 BOLT AND LOCKWASHER, Electroplated (M5 x 18)
12 13-16079 LOCKWASHER
13 853802 RETAINER, Throttle Cable
14 11-16081 NUT, Stainless Steel
15 25-853803 GROMMET
16 24-17028 SPRING
17 17027 CAP
18 17026 BRACKET
19 853801 BALL JOINT
20 13-400256 LOCKWASHER, (M6)
21 11-400212 NUT, (M6) Stainless Steel
22 54-17169 CLAMP
23 10-16827 SCREW
24 84-853799A2 CABLE ASSEMBLY Comment: (5.9M)
25 25-162262 GROMMET
26 8M0178532 REMOTE CONTROL Comment: (Without Quicksilver Decal)
27 10-853989 SCREW
28 23-853990 SPACER
29 12-853991 WASHER
30 11-400212 NUT, (M6) Stainless Steel
31 85-8539921 TERMINAL EYE
32 53-160572 E RING
33 25-853993 GROMMET
34 19-853994 PLUG
35 25-853995 GROMMET
36 25-8539951 GROMMET
37 10-853997A1 MOUNTING KIT, Twin Remote Control
38 NSS NOT SOLD SEPARATE, Throttle/shift Cable Comment: (See Accessory Guide)
Remote Control(With Quicksilver Decal) (35 parts) Remote Control(With Quicksilver Decal)
Ref OEM Part # Part Name
- 8M0178532 REMOTE CONTROL Comment: (With Qucksilver Decal)
1 16910A1 HOUSING KIT, Front
2 16916A1 CAP ASSEMBLY
3 16913T LEVER
4 16915 LOCK ARM
5 10-40056105 SCREW, (M5 x 10)
6 16921 BRACKET, Lock Bar Support
7 10-4005685 SCREW, (M4 x 10)
8 24-16924 SPRING
9 16914 GRIP
10 17016 PLUG
11 16899T HOLDER, Neutral Lock
12 10-40118107 SCREW, (M5 x 18)
13 13-16923 LOCKWASHER, External
14 16917 COVER
15 10-40116110T SCREW, (M6 x 110)
16 16920 BRAKE ADJUSTER
17 12-16896 WASHER
18 53-13194 RING, Retaining
19 16895 ARM ASSEMBLY, Brake
20 23-16875 BEARING, (1.750 Inside Diameter)
21 12-16874 WASHER
22 16918A3 GEAR SHIFT ASSEMBLY
23 54-85899A1 CLIP ASSEMBLY
24 11-401385 NUT, (M5)
25 23-16871 BEARING (.36 Inches Inside Diameter)
26 23-16868 BEARING, (.750 Inside Diameter)
27 12-16870 WASHER
28 13-16872 LOCKWASHER
29 23-16869 BEARING (.87 Inches Inside Diameter)
30 16892T GEAR, Drive
31 850723A2 PLATE/STUD ASSEMBLY
32 16873 ROLLER, Cam
33 10-4007154 SCREW, (M8 x 30)
34 12-8M0207778 WASHER
Remote Control(With Quicksilver Logo) (27 parts) Remote Control(With Quicksilver Logo)
Ref OEM Part # Part Name
- 8949112 KEY, Ignition (2F)
35 24-16882 SPRING
36 16880 CLIP
37 10-4005683 SCREW, (M4 x 6)
38 16879 ROLLER, Detent
39 87-17277T SWITCH ASSEMBLY
40 10-4005647 SCREW, (M3 x 16)
41 16886 CLIP
42 16884 ROLLER
43 24-16888 SPRING
44 16912T COVER (Bottom)
45 16883 DRUM ASSEMBLY
46 13-16922 WAVE WASHER
47 16911T COVER (Top)
48 23-16887 BEARING, (.810 Inside Diameter) (.81 Inches Inside Diameter)
49 16919A1 LEVER ASSEMBLY
50 10-40118106 SCREW, (M5 x 12)
51 17063T SPACER
52 12-35280 WASHER, (.255 x .620 x .030) Stainless Steel
53 11-401196 NUT, (M6)
54 87-17009A5 SWITCH ASSEMBLY, Ignition (See Below For Keys)
55 11-879755 NUT, Special - Chrome Brass
56 90468A1 COVER ASSEMBLY, Key
57 84-850731A2 HARNESS ASSEMBLY
58 54-816311T TIE STRAP, (8.00 Inches)
59 19-11023 PLUG
60 15920Q54 LANYARD ASSEMBLY
Remote Control(Without Quicksilver Decal) (42 parts) Remote Control(Without Quicksilver Decal)
Ref OEM Part # Part Name
- 8M0178532 REMOTE CONTROL Comment: (Without Qucksilver Decal)
1 87-802997A1 NEUTRAL SWITCH
2 10-8555447 SCREW
3 84-802998A1 CABLE ASSEMBLY, Red
4 54-816311T TIE STRAP, (8.00 Inches)
5 87-802988A1 SWITCH
6 8029892,303,303 KEY Comment:
7 802990 COVER
8 87-802992A1 SAFETY SWITCH
9 823054 LANYARD
10 84-803884A1 HARNESS ASSEMBLY
11 802985 COVER
12 802971 DETENT PLATE
13 8029691 ROLLER
14 802972 RETAINER
15 10-163341 SCREW
16 23-8029633 BUSHING
17 802968 THRUST PLATE
18 802967 GEAR, Drive
19 10-171741 BOLT
20 11-16081 NUT, Stainless Steel
21 802969 ROLLER
22 8M0135304 ARM, Throttle
23 23-8029631 BUSHING
24 802982 DRUM
25 13-8029661 WAVE WASHER
26 10-953861 SCREW
27 10-802979 BOLT
28 12-16192 WASHER
29 802984 REAR PANEL
30 802980 HOUSING, Rear
31 24-8029761 SPRING
32 802983 RETAINER
33 8029692 ROLLER
34 10-163341 SCREW
35 13-802966 WAVE WASHER
36 12-802965 WASHER
37 802962 SHIFT GEAR
38 23-802963 BUSHING
39 10-95386 BOLT
40 8M0085508 LEVER
41 23-8029634 BUSHING
Service/Support Material (1 parts) Service/Support Material
Ref OEM Part # Part Name
0 90-853985 SERVICE MANUAL
Starter Lock (26 parts) Starter Lock
Ref OEM Part # Part Name
1 11-8537229 CAP NUT
2 24-8126452 SPRING
3 12-16335 WASHER
4 853761 LOCK LEVER, Starter
5 53-160572 E RING
6 8537473 LOCK ROD, Starter
7 8M0169412 SNAP, Link Rod
8 853759 LEVER, Interlock
9 10-162453 SCREW
10 12-953921 WASHER, Stainless Steel
11 13-8537232 WAVE WASHER
12 23-8537433 BUSHING
13 8537451 ROD JOINT
14 12-953925 WASHER
15 18-8150262 COTTER PIN
16 11-16081 NUT
17 8537472 ROD, Starter Lock Arm
18 853748 SNAP, Link Rod
19 8M0096696 LEVER, Stop
20 12-16826 WASHER, Stainless Steel
21 853745 CAP
22 8537461 ROD, Throttle Stop Arm
23 853744001 BALL JOINT
24 853710 SET RING Comment: (Shown as Reference #14 on Cylinder Block)
25 812632T01 HOUSING, Starter Comment: (Shown as Reference #1 on Recoil Starter)
26 853766 PLATE, Stopper Comment: (Shown as Reference #38 on Drive Shaft Housing)
Swivel Bracket (22 parts) Swivel Bracket
Ref OEM Part # Part Name
1 1400-8M0161543 SWIVEL BRACKET
2 22-824969 FITTING, Grease
3 808599 CAP
4 23-8537435 BUSHING
5 162052 FRICTION PLATE
6 24-953831 SPRING
7 10-4000354 SCREW, (M8 x 30)
8 84-898101089 WIRE, Ground Comment: SN# 0N052888 & Up
9 10-8230427 BOLT, (M6 x 12)
10 853770T01 SHAFT ASSEMBLY, Steering
11 53-8537141 C CLIP
12 12-879194002 WASHER
13 162041 THRUST PLATE, Upper
14 26-8537076 SEAL, Oil
15 23-8537436 BUSHING
16 12-162382 WASHER
17 8537721 LOCK PLATE
18 11-85372215 NUT
19 16204004 THRUST PLATE, Lower
20 853786 YOKE, Bottom
21 8537731 BUMPER
22 53-8537142 C-RING
Throttle Linkage (26 parts) Throttle Linkage
Ref OEM Part # Part Name
1 853744001 BALL JOINT
2 853745 CAP
3 11-16081 NUT
4 853746004 LINK ROD
5 10-16123 SCREW
6 16-879194297 STUD
7 23-853743 BUSHING
8 12-8M0135942 WASHER
9 11-95374 NUT, (M8)
10 8M0103002 ARM, Actuator
11 853747009 LINK ROD
12 853748 SNAP, Link Rod
13 8537451 ROD JOINT
14 853749001 PIN
15 11-400212 NUT
16 12-953925 WASHER
17 18-8150262 COTTER PIN
18 10-162452 SCREW
19 12-953921 WASHER, Stainless Steel
20 8537503 CAM, Throttle
21 13-8537232 WAVE WASHER
22 23-8537431 BUSHING
23 8M0169412 SNAP, Link Rod
24 853747010 ROD, Throttle Link
25 853710 SET RING Comment: (Shown as Reference #14 on Cylinder Block)
26 160932 SHAFT, Throttle Comment: (Shown as Reference #16 on Tiller Handle)
Tiller Handle (23 parts) Tiller Handle
Ref OEM Part # Part Name
1 8M0055716 HANDLE, Steering
2 37-8M0097201 DECAL
3 160861 GRIP
4 10-8150461 SCREW
5 23-8537152 SPACER
6 18-8150263 COTTER PIN
7 23-16191 SPACER
8 23-16336 BUSHING
9 13-8537232 WAVE WASHER
10 160931 SHAFT, Throttle
11 10-8M0111108 BOLT
12 10-8M0050498 BOLT
13 11-8537227 NUT, Nylon
14 10-168302 BOLT
15 853752 BRACKET
16 160932 SHAFT, Throttle
17 25-16823 GROMMET
18 25-16226 GROMMET (Electric)
19 23-952869 COLLAR
20 12-16192 WASHER
21 23-9528610 COLLAR
22 43-853751 GEAR, Pinion
23 17-952186 PIN, Roll
Tools (18 parts) Tools
Ref OEM Part # Part Name
- 91-8M0059838 TOOL, Flywheel Stripper Comment: (Not Shown)
1 91-8M0059838 PULLER ASSEMBLY TOOL, Flywheel
2 91-8539962 INSTALL/REMOVER TOOL, Piston Pin
3 91-85399618 MOUNT RUBBER PULLER KIT
4 91-8539966 TOOL (For Removing)
5 91-8539968 TOOL (For Replacing)
6 91-85399612 WRENCH TOOL
7 91-85399614 SOCKET TOOL, Bevel Gear B Nut
8 91-85399610 INSTALL TOOL, Clutch Pin
9 91-8M0060180 PULLER TOOL, Bearing
10 91-85399616 BACKLASH MEASURING TOOL
11 91-895195A01 PULLER KIT, Needle Roller Bearing
12 91-8031332 FLANGE
13 91-8031333 SHAFT
14 12-1614010 WASHER
15 11-85372220 NUT
16 91-8031336 FLANGE
17 91-8031337 GUIDE TOOL

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 25 (2 CYL.) (International) 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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