Mercury 25 SEAPRO (4-STROKE) (0R051710 & Up) Parts & Diagrams

🔎 Mercury 25 SEAPRO (4-STROKE) Reference Library — Exploded parts diagrams (20 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 25 SEAPRO (4-STROKE) 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 SEAPRO (4-STROKE):

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 SEAPRO (4-STROKE).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
-	50-8M0075043	STARTER MOTOR KIT, Electric

▶Camshaft and Oil Pump (23 parts)

Ref	OEM Part #	Part Name
-	895188A05	POWERHEAD ASSEMBLY
1	834956002	CAMSHAFT
2	17-95218015	PIN, Camshaft
3	8M0117630	PUMP, Oil
4	27-853523002	GASKET
5	10-850879002	SCREW
6	28-95229	KEY
7	26-825455001	SEAL, Oil
8	12-895118003	WASHER
9	43-834973002	PULLEY, Driven
10	10-16705	BOLT
11	12-895118	WASHER
12	57-895120001	TIMING BELT
13	895265	TENSIONER, Belt
14	895266	COVER, TENSIONER
15	10-803876001	BOLT
16	12-879194340	WASHER, Stainless Steel
17	24-815093002	SPRING, Tensioner
18	851845001	HOOK
19	11-855679002	NUT
20	13-823032001	LOCKWASHER
21	895119001	PLATE
22	834955T02	PULLEY, Drive

▶Carburetor (44 parts)

Ref	OEM Part #	Part Name
1	3303-895110A05	CARBURETOR, Upper
2	802690007	FLOAT Comment: (Bowl Lower)
3	27-802699004	GASKET, Float Bowl
4	853830002	PLUNGER
5	24-895116001	SPRING
6	10-895136001	SCREW
7	10-162601	SCREW
8	10-803509015	SCREW, Drain
9	27-8M0094878	GASKET
10	16253004	FLOAT
11	17-16256004	FLOAT, Arm Pin
12	10-16196001	SCREW
13	895115001	BOOT, Rubber
14	853746003	ROD, Link
15	802700005	NOZZLE, Main
16	802701006	JET, Main #82
17	803689004	JET, Slow #45
18	16252	CAP
19	898101063	VALVE, Float
20	853721	PIN, Valve
21	54-16255	CLIP
22	855540003	COVER, Carburetor
23	27-855541004	GASKET
24	10-855542	SCREW
25	854254004	ENRICHENER
26	854255001	PLATE
27	10-855542	SCREW
28	3303-895110A06	CARBURETOR, Center
29	3303-895110A07	CARBURETOR, Lower
30	10-16263	SCREW
31	24-16264002	SPRING
32	10-803509016	SCREW, Drain
33	32-895153005	HOSE, Rubber
34	32-895153003	HOSE, Rubber
35	22-812960004	CONNECTOR
36	54-816311T	TIE STRAP, (8.00 Inches)
37	32-895153004	HOSE, Rubber
38	32-895153008	HOSE, Rubber
39	22-73318002	TEE, Fitting
40	32-895153002	HOSE, Rubber
41	32-895153006	HOSE, Rubber
42	32-895153007	HOSE, Rubber
43	54-953951	CLAMP
44	853761001	LEVER, Link Components

▶Clamp Brackets (43 parts)

Ref	OEM Part #	Part Name
1	3418-898101T26	CLAMP BRACKET, Starboard, 14MM Thread Comment: SN# 0N074967 & Up
2	3418-898101T25	CLAMP BRACKET, Port, 14MM Thread Comment: SN# 0N074967 & Up
3	10-851866008	BOLT
4	11-853722029	NUT
5	11-85372214	CAP NUT
6	23-8537435	BUSHING
7	898101044	PIN, Spacer
8	12-16826	WASHER, Stainless Steel
9	11-400212	NUT
10	898101207	PIN, Tilt
11	24-8126455	SPRING
12	10-8M0054653	THUMB SCREW ASSEMBLY, 14 MM Thread Size Comment: SN# 0N074967 & Up
13	12-95379	PAD
14	37-823701003	DECAL, Co-Pilot
15	97-804043	ANODE
16	10-879194264	BOLT
17	10-879194310	BOLT
18	12-16192	WASHER
19	11-879194337	NUT
20	8537474	ROD, Reverse Lock
21	162131	ARM, Reverse Lock
22	24-879194008	SPRING Comment: (Long)
23	18-8150261	COTTER PIN
24	84-898101089	GROUND WIRE, To Swivel Bracket
25	8537475	LINK, Reverse Lock
26	24-953833	SPRING
27	10-8230427	BOLT
28	853759T01	LEVER, Reverse Lock
29	8M0183798	GRIP
30	8M0051399	BUTTON
31	10-162612	BOLT
32	13-17641	WAVE WASHER
33	12-953921	WASHER, Stainless Steel
34	162132	ARM, Reverse Lock
35	10-879194007	SCREW
36	12-953921	WASHER, Stainless Steel
37	8M0157131	STOPPER, Tilt
38	10-8M0098607	BOLT
39	879194006	SET PLATE
40	17-95218016	PIN, Spring
41	8251131	BRACKET
42	853774	STOP
43	24-953832	SPRING

▶Cowling (36 parts)

Ref	OEM Part #	Part Name
-	37-895763A05	DECAL SET
1	114-803580A12	TOP COWL ASSEMBLY
2	16218009	TILT HANDLE
3	853788001	ROLLER
4	12-953921	WASHER, Stainless Steel
5	53-953181	E RING
6	12-953921	WASHER, Stainless Steel
7	11-400212	NUT
8	895178002	SEAL, Rubber
9	2189-853778007	BOTTOM COWL
10	10-16830	BOLT
11	12-161404	WASHER
12	23-853715007	SPACER
13	23-8537437	MOUNT, Rubber
14	25-16226	GROMMET
15	54-803563005	CLAMP
16	54-95395	CLIP, Stainless Steel
17	32-851848011	TUBING, (300 mm)
18	22-8M0182334	CONNECTOR, Fuel - Brass
19	10-8M0102279	BOLT, Stainless Steel
20	878311	CAP
21	25-162312	GROMMET
22	NSS	NOT SOLD SEPARATE, Decal-Oil Pressure
23	10-879194268	BOLT
24	895174001	COVER
25	25-895175002	GROMMET
26	10-8M0147119	BOLT
27	37-802987001	DECAL, F, N, R
28	NSS	NOT SOLD SEPARATE, Decal Storage
29	817015003	LATCH, Cowl
30	26-16219	SEAL
31	23-163365	BUSHING
32	16222003	HOOK, Cover
33	13-16221	WAVE WASHER
34	10-8230427	BOLT
35	12-953921	WASHER, Stainless Steel

▶Crankshaft, Pistons and Connecting Rods (15 parts)

Ref	OEM Part #	Part Name
-	895188A05	POWERHEAD ASSEMBLY
1	400-834957A02	CRANKSHAFT
2	31-834960010	BEARING Comment: (Blue)
3	26-855681002	SEAL, Oil, Upper
4	26-898101123	SEAL, Oil, Lower
5	700-834963003	PISTON Comment: (0.5 MM Oversize)
6	39-8035181	RING, Piston - Top Comment: (0.5 MM Oversize)
7	39-8035191	RING, Piston - Second Comment: (0.5 MM Oversize)
8	26-8035201	RING, Oil Comment: (0.5 MM Oversize)
9	600-834961003	ROD, Connecting
10	10-8035092	BOLT
11	53-160573	E RING
12	41-898103113	PIN, Piston
13	28-160531	KEY
14	28-825666001	KEY

▶Cylinder Block (28 parts)

Ref	OEM Part #	Part Name
-	895188A05	POWERHEAD ASSEMBLY
1	878-815013A07	CYLINDER BLOCK
2	17-16119	PIN, Dowel
3	10-855677006	BOLT
4	10-853531001	BOLT
5	12-16826	WASHER, Stainless Steel
6	10-855677004	BOLT
7	17-16119	PIN, Dowel
8	855550001	EYE, Lifting
9	10-16830009	BOLT
10	8M0119207	THERMOSTAT, 60 Degrees
11	27-8M0214960	GASKET
12	8537052	CAP
13	10-879194264	BOLT
14	10-16832	BOLT
15	97-823912	ANODE
16	27-895150001	GASKET
17	97-895151001	PLUG, Anode
18	10-167051	BOLT
19	35-8M0162832	FILTER ASSEMBLY, Oil Comment: (Quicksilver)
20	27-835427T04	GASKET
21	803512002	DIPSTICK
22	32-8M0057119	HOSE, Rubber (220 mm)
23	54-816311T	TIE STRAP, (8.00 Inches)
24	35-895152003	STRAINER, Oil
25	898101142	PLUNGER
26	853752002	BRACKET
27	10-16223	BOLT, (M6 x 14)

▶Cylinder Head (25 parts)

Ref	OEM Part #	Part Name
-	895188A05	POWERHEAD ASSEMBLY
1	900-835430A04	CYLINDER HEAD ASSEMBLY
2	27-850836002	GASKET
3	17-16119	PIN, Dowel
4	10-855677002	BOLT
5	10-853531001	BOLT, Cylinder Head
6	12-16826	WASHER, Stainless Steel, Cylinder Head Cover
7	22-8M0229353	PLUG
8	27-95220	GASKET
9	32-851848009	TUBING, (450 mm)
10	22-898101961	NIPPLE
11	33-8M0204682	SPARK PLUG, NGK#DCPR6E (NGK#DCPR6E)
12	853756001	PLATE
13	10-16828	BOLT
14	32-812940006	PIPE, Oil (330 mm), To Air Silencer
15	54-803525003	CLIP
16	834954002	COVER, Cylinder Head
17	10-16830A1	SCREW KIT
18	36-8M0135589	CAP ASSEMBLY, Oil Filler
19	25-803513007	O-RING
20	54-8M0130961	CLAMP
21	27-803508T18	GASKET
22	834974001	PLATE, Breather
23	10-823031016	SCREW
24	32-8M0057121	HOSE, Rubber (290 mm), To Engine Base

▶Driveshaft Housing (26 parts)

Ref	OEM Part #	Part Name
-	27-835427A05	GASKET SET, Powerhead
1	1500-8M0192164	HOUSING, Driveshaft Comment: (Long)
2	95275002	PLATE
3	10-898103227	BOLT
4	12-16192	WASHER
5	10-8M0224584	BOLT
6	10-895136002	BOLT, Drain
7	12-895146	WASHER
8	853577001	COVER, Drain
9	27-854617001	GASKET
10	10-898101953	BOLT
11	17-16119	PIN, Dowel
12	895147001	COVER, Idle Port
13	27-895148001	GASKET
14	25-881305005	GROMMET
15	10-167051	BOLT
16	895149001	APRON
17	852432002	SEAL, Rubber
18	10-16257004	SCREW, Tapping
19	12-16826	WASHER, Stainless Steel
20	851852002	ADAPTER PLATE, With Nipple
21	852432001	SEAL, Rubber
22	27-803663T15	GASKET
23	26-8537072	SEAL, Oil
24	19-803593	PLUG
25	27-835427T04	GASKET

▶Electrical Components (44 parts)

Ref	OEM Part #	Part Name
1	262-803577002	FLYWHEEL
2	11-851832	NUT
3	12-8539911	WASHER
4	16058003	STATOR
5	10-853536001	SCREW
6	895267	BRACKET, Coil
7	10-879194264	BOLT
8	54-8M0130961	CLAMP
9	10-162231	BOLT
10	835395001	COIL, Pulser
11	835395002	COIL, Pulser
12	835395003	COIL, Pulser
13	10-878388001	SCREW
14	835401003	CD UNIT
15	10-167051	BOLT
16	84-895121A02	HARNESS ASSEMBLY, CD
17	19-853994	PLUG
18	84-895121A03	HARNESS ASSEMBLY, CD
19	339-803559A03	COIL ASSEMBLY, Ignition
20	85-803560002	CAP, Plug
21	54-803563005	CLAMP
22	835403004	PLATE, CD Unit
23	10-823042	BOLT, Stainless Steel
24	12-953921	WASHER, Stainless Steel
25	12-953923	WASHER, Rubber
26	25-851815005	GROMMET
27	23-952868	COLLAR
28	87-823037A2	SWITCH ASSEMBLY, Stop - Lanyard
29	823054	LANYARD
30	892779	BRACKET
31	32-895108002	SLEEVE, Protective
32	32-895108003	SLEEVE, Protective
33	895268	SENSOR, Overheat
34	803762	CLAMP
35	10-17174	BOLT
36	84-895122A01	CABLE ASSEMBLY
37	10-162231	BOLT
38	802996001	BUZZER, Overheat
39	10-855544012	SCREW
40	84-824372A04	CABLE ASSEMBLY, Red
41	19-853994	PLUG
42	804057001	PILOT LAMP
43	87-8M0163139	SWITCH
44	84-803539001	WIRE, Lead

▶Fuel Tank Assembly(6.6 Gallon) (8 parts)

Ref	OEM Part #	Part Name
1	1265-859065A3	TANK ASSEMBLY, Fuel, Fuel
2	36-816976Q1	CAP ASSEMBLY, Fuel-Manual Vent, Fuel
3	27-8169771	GASKET, Fuel Cap, Fuel Cap
4	27-859072	GASKET, Pick Up Body
5	8M0084090	PICK UP ASSEMBLY, Fuel
6	859056	FLOAT
7	10-40056107	SCREW, (M5 x 16)
8	12-859080	WASHER, Fiber

▶Gear Housing, Driveshaft (40 parts)

Ref	OEM Part #	Part Name
-	27-8M0089636	GASKET SET, Lower Unit
1	1668-8M0057242	GEAR HOUSING ASSEMBLY, Basic
2	31-813048006	BEARING, Needle
3	853763	STRAINER SET, Water
4	10-17635	SCREW
5	11-85372216	NUT
6	16133	STRAINER, Water
7	10-898101959	SCREW
8	853762	TRIM TAB
9	10-167051	BOLT
10	11-85372211	NUT
11	43-16138T01	GEAR, Pinion (12 Teeth)
12	24-8126454	SPRING
13	853765T	PIPE
14	45-16136T02	DRIVESHAFT Comment: Long
15	28-161551	KEY
16	30-16128T02	BEARING, Tapered roller
17	15-813276005	SHIM, (0.5)
18	26-161622	SEAL, Oil
19	25-8537096	O-RING
20	46-8260531	HOUSING, Water Pump - Lower
21	27-161602	GASKET
22	803753002	PLATE, Water Pump Guide
23	27-16158010	GASKET
24	17-952188	PIN, Dowel
25	47-803748002	IMPELLER
26	803751002	PUMP, Liner Housing
27	46-803750T05	HOUSING, Water Pump
28	26-161681	SEAL
29	10-823042046	BOLT
30	25-804903001	GROMMET
31	32-803755007	TUBE, Water Comment: Long
32	32-8M0057120	HOSE, Rubber (15 mm) Comment: Long
33	22-8M0229353	PLUG
34	27-95220	GASKET
35	10-879194307	BOLT
36	12-16192	WASHER
37	10-879194302	BOLT, Stud Comment: Short
38	11-879194337	NUT
39	10-879194308	BOLT Comment: Long and X-Long

▶Gear Housing, Propeller Shaft (26 parts)

Ref	OEM Part #	Part Name
-	27-8M0089636	GASKET SET, Lower Unit
1	1668-8M0057242	GEAR HOUSING ASSEMBLY, Basic
2	30-16128T01	BEARING, Ball
3	15-161631	SHIM, (0.1) Comment: (0.1)
4	43-8M0183179	GEAR, Forward
5	161521	FOLLOWER, Cam
6	30-161322	BALL, Steel
7	853764003	HOLDER
8	24-8126453	SPRING
9	52-898103030	CLUTCH
10	17-161501	PIN
11	24-176672	SPRING
12	44-19513T01	PROPELLER SHAFT
13	8M0070880	CARRIER ASSEMBLY, Bearing
14	25-161311	O-RING
15	30-16132T01	BEARING, Ball
16	31-813048T05	BEARING, Needle
17	26-161301	SEAL, Oil
18	10-879194273	BOLT
19	12-161401	WASHER
20	43-812945T02	GEAR, Reverse
21	161452	THRUST HUB
22	48-8M0047582	PROPELLER Comment: (14)
23	12-161402	WASHER
24	11-161471	PROP NUT
25	18-8150264	COTTER PIN

▶Intake Manifold and Fuel Pump (26 parts)

Ref	OEM Part #	Part Name
-	27-835427A05	GASKET SET, Powerhead
1	804887001	MANIFOLD, Inlet
2	10-853531004	BOLT
3	12-895106002	WASHER
4	27-853525002	GASKET
5	17-16119	PIN, Dowel
6	10-823042046	BOLT
7	54-8M0130961	CLAMP
8	27-16327001	GASKET, Carburetor
9	853526002	INSULATOR
10	10-855809001	BOLT
11	12-16826	WASHER, Stainless Steel
12	853526003	FLANGE, Air Silencer
13	25-825057005	O-RING
14	26-855560001	SEAL, Rubber
15	54-953951	CLAMP
16	853728002	SILENCER, Air
17	54-853798001	CLAMP
18	10-167051	BOLT
19	23-952868	COLLAR
20	803529T04	PUMP, Fuel
21	10-823042	BOLT, Stainless Steel
22	25-16109003	O-RING
23	54-95395	CLIP, Stainless Steel
24	32-851848010	TUBING, Rubber (160 mm)
25	35-8M0157133	FILTER, Fuel

▶Intake and Exhaust Valves (19 parts)

Ref	OEM Part #	Part Name
-	895188A05	POWERHEAD ASSEMBLY
1	850838T02	VALVE, Intake
2	850839T02	VALVE, Exhaust
3	26-822647001	SEAL, Intake - Black
4	26-822647002	SEAL, Exhaust - Green
5	24-898101214	SPRING
6	8M0158660	SEAT
7	803555	RETAINER
8	28-803556	KEEPER, Valve
9	850841003	ARM, Rocker
10	10-825046001	SCREW, Adjusting
11	11-826150001	NUT, Adjusting
12	850842002	SHAFT, Rocker
13	850842003	SHAFT, Rocker
14	10-823042036	BOLT
15	825451001	COLLAR
16	24-825452002	SPRING
17	24-825453001	SPRING
18	12-895118001	WASHER

▶Recoil Starter (32 parts)

Ref	OEM Part #	Part Name
1	8M0170582	STARTER ASSEMBLY, Recoil
2	803716005	HOUSING, Starter
3	804029	HANDLE, Starter
4	853755002	CAP, Starter Handle
5	24-812645008	SPRING
6	804031002	LOCK, Starter
7	50-8M0110715	ROPE, Starter
8	24-804024008	SPRING, Starter
9	53-852784001	E RING
10	803717002	REEL
11	24-8M0126988	SPRING, Friction
12	812638002	PLATE, Friction
13	10-8M0126987	BOLT
14	812635T03	RATCHET
15	898101148	RATCHET GUIDE
16	24-812634004	SPRING, Return
17	804035001	PULLEY, Starter
18	10-8248324	BOLT, Stainless Steel
19	824995004	SEAL, Rubber
20	10-16705	BOLT, Stainless Steel
21	12-953921	WASHER, Stainless Steel
22	11-856949002	NUT
23	895131A03	CABLE ASSEMBLY, Starter
24	24-812645009	SPRING
25	23-855545004	COLLAR
26	895133T01	COVER, Belt
27	10-16705	BOLT, Stainless Steel
28	12-953921	WASHER, Stainless Steel
29	23-952868	COLLAR
30	10-8M0204707	SCREW, (M6 x 25)
31	878369	DECAL, Spark Plug
32	NSS	NOT SOLD SEPARATE, Caution Lable B

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
-	90-895257005	PARTS MANUAL, 25HP Seapro 4-Stroke International

▶Shift Components (23 parts)

Ref	OEM Part #	Part Name
-	27-8M0089636	GASKET SET, Lower Unit
1	8M0172382	CAM
2	803760007	ROD, Cam Comment: (Long)
3	17-16179	PIN
4	23-16176007	BUSHING
5	25-161772	O-RING
6	25-161782	O-RING
7	10-8230427	BOLT
8	12-953921	WASHER, Stainless Steel
9	853794	RETAINER
10	803766004	ROD, Shift
11	803767003	ROD, Joint Shift
12	17-952189	PIN, Dowel
13	25-16823	GROMMET
14	803763003	LEVER, Shift
15	26-16219	SEAL
16	851862001	SHIFT ARM
17	54-851863	CLIP
18	803768004	LEVER, Rod Shift
19	892775	JOINT, Cable
20	12-953925	WASHER
21	18-8150262	COTTER PIN
22	11-16081	NUT

▶Swivel Bracket (40 parts)

Ref	OEM Part #	Part Name
1	3407-813029015	SWIVEL BRACKET
2	23-16336007	BUSHING
3	803774002	PLATE, Thrust
4	25-16109002	O-RING
5	53-804027001	C-RING
6	22-824969	FITTING, Grease
7	10-895140002	BOLT
8	8M0145395	DISC
9	12-895146003	WASHER
10	895171001	HANDLE, Co-Pilot
11	12-895146001	WASHER
12	11-95374001	NUT, Nylon
13	895172001	PLATE, Co-Pilot
14	10-8248324	BOLT, Stainless Steel
15	8M0163141	TUBE, Swivel
16	853771005	MOUNT, Upper
17	853772003	PLATE, Upper Lock
18	853773004	DAMPER, Upper
19	12-895168001	WASHER
20	10-812935007	BOLT
21	853773003	DAMPER, Upper
22	853755003	MOUNT, Retainer
23	10-16705	BOLT, Stainless Steel
24	12-162382	WASHER
25	853772002	PLATE, Lock
26	11-85372215	NUT
27	8M0192168	YOKE, Bottom
28	8537732	RUBBER DAMPER
29	84-898101091	CABLE ASSEMBLY, Ground, To Rubber Cop
30	10-8230427	BOLT
31	10-851866009	BOLT
32	12-879194343	WASHER
33	84-8537405	GROUND WIRE, To Lower Mount
34	12-16826	WASHER, Stainless Steel
35	8M0075315	MOUNT
36	12-851867	WASHER
37	12-953928	WASHER
38	11-95374002	NUT
39	851869002	COVER
40	10-167051	BOLT

▶Tiller Handle (27 parts)

Ref	OEM Part #	Part Name
1	803996002	Handle, Steering
2	23-823939001	BUSHING
3	12-822145001	WASHER
4	13-826792001	WAVE WASHER,
5	826648001	PLATE, Handle
6	16-815028	STUD BOLT
7	12-16826	WASHER, Stainless Steel
8	11-400212	NUT
9	895131A04	CABLE ASSEMBLY, Throttle
10	32-895108004	SLEEVE, Protective
11	804019002	BRACKET, Steering
12	54-851863001	CLAMP
13	10-895140003	BOLT
14	12-879194340	WASHER, Stainless Steel
15	17-16085	PIN
16	16338	BRACKET
17	10-16827	SCREW
18	803998002	SHAFT, Throttle
19	813026	FRICTION PIECE
20	10-16087	SCREW, Adjusting
21	12-16826	WASHER, Stainless Steel
22	11-400212	NUT
23	853775003	GRIP
24	10-803876002	SCREW
25	37-824200005	DECAL, Throttle
26	23-16191	SPACER
27	23-16336	BUSHING

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 25 SEAPRO (4-STROKE) 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.

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