Mercury 125 (4 CYL.) (0T980000 THRU 0T999999) Parts & Diagrams

🔎 Mercury 125 (4 CYL.) Reference Library — Exploded parts diagrams (34 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 125 (4 CYL.) is a 2-Stroke DFI, Inline 3-Cylinder outboard motor. Powers center-console boats, larger pontoons, and offshore-capable fishing craft.

Quick Reference Specifications

Specification	Value
Engine Type	2-Stroke DFI, Inline 3-Cylinder
Horsepower	125 HP
Displacement	1526 cc (1.5L)
Bore x Stroke	92 mm x 76 mm
Spark Plug (Type & Gap)	NGK IZFR5J
Engine Oil Capacity	—
Recommended Engine Oil	Mercury OptiMax/DFI Oil
Gear Case Oil Capacity	828 mL (28 oz)
Idle Speed (in gear)	650–700 RPM (in gear)
Full Throttle RPM Range	5000-5750
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 125 (4 CYL.):

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 125 (4 CYL.).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
-	858566A1	FLUSH KIT, Coastal

▶Attenuator Plate (24 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	27-151724	GASKET
2	44342A1	COVER
3	19-815784	CAP
4	NSS	NOT SOLD SEPARATE, Timing
5	NSS	NOT SOLD SEPARATE, Decal-Caution-Airbox
6	27-828479	GASKET
7	10-878609	SCREW, (#10-16 x .600)
8	44340A2	PLATE ASSEMBLY, Attenuator
9	12-4002217	WASHER
10	11-826365	NUT
11	39519	CUP
12	98889	LATCH
13	32-9912878	HOSE, (.187) (26.00 Inches Bulk) (Cut to 1.50 Inch Length)
14	32-9912878	HOSE, (.187) (26.00 Inches Bulk) (Cut to 3.25 Inch Length)
15	8M0214940	TIE STRAP, (5.50 Inches)
16	22-830285	FITTING TEE
17	32-9912878	HOSE, (.187) (26.00 Inches Bulk) (Cut to 5.25 Inch Length)
18	825203T	LINK, Throttle (Main)
19	193859	LINK ROD
20	11399A1	ARM ASSEMBLY
21	10-40056103	SCREW, (M5 x 6)
22	12-8M0204666	WASHER, (.203 x .500 x .032)
23	67748	ROLLER

▶Bleed System (16 parts)

Ref	OEM Part #	Part Name
-	17791T97	POWERHEAD ASSEMBLY
1	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 9.00 Inch Length)
2	22-59169003	FITTING, Tee
3	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 9.00 Inch Length)
4	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 4.50 Inch Length)
5	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 2.50 Inch Length)
6	21-149126	CHECK VALVE
7	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 2.50 Inch Length)
8	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 2.50 Inch Length)
9	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 4.50 Inch Length)
10	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 2.50 Inch Length)
11	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 2.50 Inch Length)
12	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 2.50 Inch Length)
13	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 6.00 Inch Length)
14	32-892024122	TUBING, (240.00 Inches Bulk) Comment: (Cut to 1.50 Inch Length)
15	22-15133	FITTING

▶Bottom Cowl (22 parts)

Ref	OEM Part #	Part Name
1	100-8M0107327	BOTTOM COWL ASSEMBLY, Starboard
2	25-822556003	GROMMET
3	8M0109216	SEAL, (36.00 Inches)
4	100-8M0107328	BOTTOM COWL ASSEMBLY, Port
5	25-822555001	GROMMET
6	8M0109216	SEAL, (36.00 Inches)
7	8560552	SEAL
8	87-8M0042301	SWITCH ASSEMBLY
9	22-813613	FITTING
10	32-8M0108349	TUBING, (.312) (70.00 Inches Bulk) (Cut to 28.00 Inch Length)
11	21-817519A2	CHECK VALVE ASSEMBLY, Drain
12	10-82130040	SCREW, (M6 x 40)
13	8M0041366	HANDLE
14	23-812707	BUSHING
15	13-F2047	WASHER, Wave
16	8M0001081	CAM
17	12-8M0214930	WASHER
18	13-26992	LOCKWASHER, (.250) Stainless Steel
19	10-28635	SCREW, (.250-20 x .620) Stainless Steel
20	822363T1	RETAINER
21	11-401386	NUT, (M6) Stainless Steel
22	12-8M0214930	WASHER

▶Carburetor (26 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	3301-884587T10	CARBURETOR, (125-WME 112-4)
2	NSS	NOT SOLD SEPARATE, Gasket-Fuel Bowl
3	NSS	NOT SOLD SEPARATE, Retaining Ring
4	1395-811693	BOWL, Fuel
5	1395-823632	SHAFT, Throttle (WME-111-1/3/4 and WME 112-1/3/4)
6	1395-8236321	SHAFT, Throttle (WME-111-2 and WME 112-2)
7	1395-8087461	LEVER, Throttle
8	1395-97241	VALVE, Throttle
9	1395-9594	FLOAT
10	F10064	SHAFT
11	10-95951	VALVE, Inlet Needle
12	1395-811694	PLUG KIT
13	1395-802731	SEAL (Consists of 4 Seals)
14	NSS	NOT SOLD SEPARATE, Gasket-Cover Plate
15	27-151724	GASKET
16	10-F10155	SCREW, Throttle Valve
17	1395-811220	SCREW, Cover Plate
18	1395-808612	SCREW AND WASHER, (#8-32 x .750)
19	1395-811221	COVER PLATE
20	1399-3796	JET, (.076) (WME-112-3/4)(125)
21	1395-808738	GASKET
22	NSS	NOT SOLD SEPARATE, Spring-Idle Needle
23	NSS	NOT SOLD SEPARATE, Spring-Throttle Return
24	NSS	NOT SOLD SEPARATE, Idle Needle
25	1395-823634	SCREW

▶Co-Pilot (10 parts)

Ref	OEM Part #	Part Name
-	56-52148A7	CO-PILOT ASSEMBLY
1	521481	PILOT ROD
2	11-8M0103848	NUT ASSEMBLY
3	10-56500	SCREW, (.250-28 x 1.250)
4	12-77674	WASHER
5	821621	KNOB, Prong
6	873491	ROD
7	23-521512	BUSHING
8	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel
9	11-826709111	NUT, (.312-24) Stainless Steel

▶Crankshaft, Pistons and Connecting Rods (23 parts)

Ref	OEM Part #	Part Name
-	17791T97	POWERHEAD ASSEMBLY
1	473-9193T5	CRANKSHAFT ASSEMBLY
2	43-43019A1	GEAR ASSEMBLY
3	30-43011T	BEARING, Ball, Lower
4	28-91800	KEY, Woodruff
5	786611	WEAR SLEEVE
6	25-35126	O-RING, (.859 x .139)
7	39-818412A4	RING ASSEMBLY
8	42943A1	BEARING ASSEMBLY, Roller
9	NSS	NOT SOLD SEPARATE, Roller Bearing
10	2704-821896A4	PISTON ASSEMBLY Comment: (.030 Oversize)
11	NSS	NOT SOLD SEPARATE, Piston Pin
12	53-857196	LOCK RING
13	39-822321A2	RING SET, Piston Comment: (.030 Oversize)
14	646-818846T6	CONNECTING ROD ASSEMBLY
15	12-8M0012298	WASHER
16	29-8M0214954	BEARING, Needle
17	10-94320	SCREW, (.375-24 x 1.250)
18	31-844338A01	BEARING ASSEMBLY
19	NSS	NOT SOLD SEPARATE, Roller Bearing
20	31-43013T3	BEARING ASSEMBLY, Roller, Upper
21	26-8M0214932	SEAL, Oil
22	25-823683	O-RING, (1.989 x .070) Comment: (1.989 x .070 Round)

▶Cylinder Block and Crankcase (56 parts)

Ref	OEM Part #	Part Name
-	17791T97	POWERHEAD ASSEMBLY
1	877-9191T24	CYLINDER BLOCK
2	10-4009680	SCREW, (M10 x 80)
3	17-8M0036405	PIN (Bearing Race)
4	17-43044	PIN, Dowel
5	428842	COVER (Top)
6	76867	COVER (Bottom)
7	10-81742750	SCREW, (M8 x 50)
8	65848	CARRIER
9	25-64872	GROMMET
10	813801A1	CARRIER ASSEMBLY
11	21-42657A3	CHECK VALVE
12	21-891664	CHECK VALVE
13	16-892561001	STUD, (M10 x 136)
14	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel
15	11-40140	NUT, (M10)
16	21-426233	CHECK VALVE
17	NSS	NOT SOLD SEPARATE, Plug
18	NSS	NOT SOLD SEPARATE, Plug
19	12-8M0204666	WASHER, (.203 x .500 x .032)
20	10-82127335	SCREW, (M8 x 35 MM)
21	99162001	BOOT
22	1035-9196A2	COVER
23	27-443284	GASKET
24	10-82127335	SCREW, (M8 x 35 MM)
25	54-814634	CLAMP
26	787992	SENDER, Temperature
27	889733	RETAINER
28	10-878609	SCREW, (#10-16 x .600)
29	86596T	POPPET VALVE
30	648771	DIAPHRAGM
31	12-94182	WASHER
32	10-69570	SCREW, (#10-16 x .750)
33	24-42996	SPRING, (Stainless Steel)
34	14586	THERMOSTAT
35	27-8M0204714	GASKET
36	27-430068	GASKET
37	8M0047619	COVER
38	10-81742755	SCREW, (M8 x 55)
39	22-328022	PLUG, Pipe (.125-27) Brass
40	16-8161949	STUD, (M6 x 44)
41	12-8M0204663	WASHER, (.187 x .500 x .062) Neoprene
42	11-816872	WING NUT
43	821889A51	REV LIMITER
44	10-82130030	SCREW, (M6 x 30)
45	84-855212A1	HARNESS ASSEMBLY, Adaptor
46	22-857175	COUPLING INSERT
47	22-857176	COUPLING BODY
48	19-858240	CAP
49	32-8M0108349	TUBING, (.312) (70.00 Inches Bulk)
50	54-816311T	TIE STRAP, (8.00 Inches)
51	22-857219	FITTING
52	22-286241	FITTING
53	54-850181	TIE STRAP, (11.750 Inches)
54	NSS	NOT SOLD SEPARATE, Decal-Serialization
55	NSS	NOT SOLD SEPARATE, Decal-Serial Overlaminate

▶Driveshaft Housing (25 parts)

Ref	OEM Part #	Part Name
1	1598-881913T02	HOUSING ASSEMBLY, Driveshaft Comment: Jet
2	16-9035015	STUD, (M10 x 227) (X-Long) Comment: Model Version Length Designation: X-Long=25 In.
3	16-8M0034462	STUD, (M10 x 190) (X-Long) Comment: Model Version Length Designation: X-Long=25 In.
4	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel
5	11-40140	NUT, (M10)
6	22-85822A4	PICKUP ASSEMBLY, Speedometer
7	22-433351	CONNECTOR, 90 Degree - With Vibraseal
8	22-85822T	CONNECTOR, Straight
9	881916	MOUNT
10	10-898835001	BOLT, (M12 x 154)
11	12-30119	WASHER, (.875 Inch Outside Diameter)
12	11-8M0204662	NUT, (M12)
13	88238A10	CABLE ASSEMBLY, Ground
14	10-41508	SCREW, (.250-20 x .500) Stainless Steel
15	8M0036786	CLAMP
16	11-35521	NUT
17	10-889833025	SCREW, (M8 x 25 MM)
18	100-8M4500754	COVER
19	10-88417	SCREW, (#12-24 x .620)
20	12-8M0204648	WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
21	12-881976	WASHER, Neoprene
22	12092A3	SPACER KIT (X-Long) Comment: Model Version Length Designation: X-Long=25 In.
23	17-8M0084244	PIN, Dowel - With Hole (.375 x .625) (X-Long)(Front) Comment: Model Version Length Designation: X-Long=25 In.
24	892214	PLATE WASHER
25	19-8M0026580	PLUG, Driveshaft Housing

▶Electrical Components (36 parts)

Ref	OEM Part #	Part Name
1	8327531	PLATE, Electrical
2	10-40011150	SCREW, (M8 x 30) Stainless Steel
3	12-49436	WASHER
4	23-8502341	BUSHING
5	25-833155	GROMMET
6	10-82239312	SCREW, (M5 x 12)
7	12-89302	WASHER, (.203 x .406 x .040)
8	8261151	CLAMP, Connector
9	84-88807A44	CABLE ASSEMBLY (10.00 Inches)
10	84-850043A2	HARNESS ASSEMBLY, Engine
11	88-812619	FUSE, Yellow - 20 Ampere
12	84-850045A2	HARNESS ASSEMBLY, Ignition
13	84-88439A3	CABLE ASSEMBLY, Positive - Battery
14	85-830233	BOOT, Insulator - Red
15	827509A10	CDM MODULE ASSEMBLY
16	84-821945A61	CABLE ASSEMBLY, Hi Tension
17	85-63709A1	BOOT/TERMINAL KIT
18	33-938	SPARK PLUG Comment: (NGK #BPZ8H-N-10)
19	10-82129116	SCREW, (M6 x 16)
20	89-817109A2	SOLENOID ASSEMBLY, (#10-32 / .3125-18 Terminals)
21	23-8M0214955	BUSHING
22	25-822179	GROMMET
23	10-32,11-45076	NUT, Brass
24	13-8M0204647	LOCKWASHER, (.312)
25	11-8M0204668	NUT, (.312-18)
26	10-82129125	SCREW, (M6 x 25 MM)
27	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
28	8M0084173	REGULATOR, Voltage
29	10-82129135	SCREW, (M6 x 35)
30	54-54457	J CLIP
31	84-88439A4	CABLE ASSEMBLY, Battery - Negative
32	54-834813	CLAMP
33	56762	TIE STRAP, (4.00 Inches)
34	12-36001	WASHER
35	84-88807A16	CABLE ASSEMBLY, (4.00 Inches) Black
36	13541	PLUG, Male

▶Exhaust Plate (27 parts)

Ref	OEM Part #	Part Name
1	881912T01	PLATE, Exhaust
2	17-23784	PIN, Dowel
3	881973	RETAINER
4	881915002	MOUNT
5	10-881975	SCREW, (M8 x 35 MM)
6	10-898487	BOLT, (M12 x 175)
7	11-896963	NUT, (M12)
8	23-11289	SPACER (X-Long) Comment: Model Length Designation X Long=25 In.
9	43585	COUPLING
10	27-430086	GASKET
11	42966T07	TUBE, Exhaust
12	10-40011151	SCREW, (M8 x 35) Stainless Steel
13	8M0039075	SEAL
14	25-89417004	GROMMET
15	32-8M0042792	TUBE, Water - X Long (18.21 Inches)
16	824661	CLAMP
17	814080001	SEAL (Upper)
18	10-889833045	SCREW, (M8 x 45)
19	881918T03	CLAMP
20	25-19565002	GROMMET
21	23-48237	BUSHING
22	79932A20	SHIFT SHAFT ASSEMBLY
23	42912A3	SHIFT LINK
24	23-48475	BUSHING
25	11-401386	NUT, (M6) Stainless Steel
26	10-40011151	SCREW, (M8 x 35) Stainless Steel
27	10-40011158	SCREW, (M8 x 70) Stainless Steel

▶Extension Kit (20 parts)

Ref	OEM Part #	Part Name
-	12092A13	EXTENSION KIT, Black
1	12092A3	SPACER KIT, Black
2	17-8M0084244	PIN, Dowel - With Hole (.375 x .625)
3	853908A1	SHIFT SHAFT ASSEMBLY
4	11288001	BUMPER, Bottom Yoke
5	23-11289	SPACER
6	17243A1	TUBE ASSEMBLY, Water - Extension
7	25-8M0204645	O-RING, (.796 x .139)
8	26-38970	SEAL
9	16-903503	STUD, (M10 x 190)
10	16-903502	STUD, (M10 x 227)
11	12-45176	WASHER, (.453 x .812 x .105) Stainless Steel
12	11-40140	NUT, (M10)
13	45-43032A4	DRIVESHAFT ASSEMBLY
14	27-430341	GASKET, Aluminum Cover
15	25-8M0214974	O-RING, (3.609 x .139)
16	25-8M0204681	O-RING, (1.424 x .103)
17	88882	BUMPER, Top Yoke
18	32-8M4501430	TUBE, Water
19	430232	SEAL

▶Flywheel and Starter Motor (22 parts)

Ref	OEM Part #	Part Name
-	84-11149A27	CABLE ASSEMBLY
1	19-45907	PLUG, Yellow
2	812777T1	COVER ASSEMBLY
3	11-42979	NUT, (M16)
4	12-33001	WASHER
5	261-878227T2	FLYWHEEL ASSEMBLY
6	398-832075A21	STATOR ASSEMBLY
7	10-4013930	SCREW, (M5 x 30)
8	854513T	TRIGGER ASSEMBLY
9	50-893892T	STARTER MOTOR ASSEMBLY
10	23-8M0034918	COLLAR
11	8M0043376	STOP, Rubber
12	84-93388A1	CABLE ASSEMBLY, (6.00 Inches) Black
13	10-69035	SCREW AND LOCKWASHER, (.250-20 x .625) Stainless Steel
14	84-93388A8	CABLE ASSEMBLY, (12.5 Inchs) Black
15	13-26992	LOCKWASHER, (.250) Stainless Steel
16	11-64015	NUT, (.250-20)
17	54-816311T	TIE STRAP, (8.00 Inches)
18	93254	SWIVEL BASE
19	93421	SWIVEL BALL
20	NSS	NOT SOLD SEPARATE, Decal-Warning High Voltage
21	37-881865	DECAL, Caution-Start in Gear (Start In Gear)

▶Fuel Pump (47 parts)

Ref	OEM Part #	Part Name
-	17791T97	POWERHEAD ASSEMBLY
1	14360A78	PUMP KIT, Fuel
2	21-857005A1	DIAPHRAGM KIT
3	NSS	NOT SOLD SEPARATE, Gasket-Boost
4	NSS	NOT SOLD SEPARATE, Diaphragm
5	NSS	NOT SOLD SEPARATE, Gasket-Pulse
6	NSS	NOT SOLD SEPARATE, Spring
7	NSS	NOT SOLD SEPARATE, Cap
8	NSS	NOT SOLD SEPARATE, Check Valve
9	NSS	NOT SOLD SEPARATE, Retainer
10	NSS	NOT SOLD SEPARATE, Spring
11	NSS	NOT SOLD SEPARATE, Cap
12	27-8M0204705	GASKET
13	144303	BASE
14	987752	PLATE
15	22-996642	FITTING, Elbow 90 Degree (.125-27 x .250) Nylon
16	10-82104540	SCREW, (M5 x 40)
17	10-82130050	SCREW, (M6 x 50), Pump To Block
18	NSS	NOT SOLD SEPARATE, Decal-Assembled in Mexico
19	32-8M0108349	TUBING, (.312) (70.00 Inches Bulk) (Cut to 4.00 Inch Length)
20	32-8M0108349	TUBING, (.312) (70.00 Inches Bulk) (Cut to 8.50 Inch Length)
21	22-996642	FITTING, Elbow 90 Degree (.125-27 x .250) Nylon (To Crankcase)
22	32-8M0108349	TUBING, (.312) (70.00 Inches Bulk) (Cut to 2.00 Inch Length)
23	35-816296Q2	FILTER, Fuel
24	54-188871	CLAMP
25	8M0214940	TIE STRAP, (5.50 Inches)
26	22-8189941	CHECK VALVE (To Oil Pump)
27	32-822554	MOLDED HOSE
28	22-822771	CONNECTOR
29	22-822769	CONNECTOR
30	32-85682257	TUBING, (26.00 Inches Bulk) (Cut to 4.00 Inch Length)
31	25-145093	GROMMET
32	32-1430165	TUBING, (38.00 Inches Bulk) (Cut to 15.00 Inch Length)
33	19-17608	FLOW RESTRICTOR
34	22-830570	FITTING, Tee
35	32-892024122	TUBING, (240.00 Inches Bulk) (Cut to 4.50 Inch Length)
36	32-892024122	TUBING, (240.00 Inches Bulk) (Cut to 2.50 Inch Length)
37	32-1430165	TUBING, (38.00 Inches Bulk) (Cut to 1.25 Inch Length)
38	35-8M0207786	FILTER
39	32-1430165	TUBING, (38.00 Inches Bulk) (Cut to 13.00 Inch Length)
40	14687A4	PUMP ASSEMBLY, Accelerator
41	32-9912688	TUBING, (36.00 Inches Bulk) (Cut to 5.25 Inch Length) (To Lower Tee)
42	10-4009416	SCREW, (M6 x 16)
43	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
44	89-819503A1	SOLENOID ASSEMBLY, Enrichner Valve
45	32-1430165	TUBING, (38.00 Inches Bulk) (Cut to 15.00 Inch Length)
46	32-9912688	TUBING, (36.00 Inches Bulk) (Cut to 11.50 Inch Length) (To Upper Tee)

▶Gasket Set Components(Engine Overhaul) (1 parts)

Ref	OEM Part #	Part Name
-	25-858225	O-RING (2.112 I.D.)

▶Gear Housing(Driveshaft)(2.07:1 Gear Ratio) (43 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	1667-9011G59	GEAR HOUSING ASSEMBLY, Basic
2	17-8M0084244	PIN, Dowel - With Hole (.375 x .625) (Front)
3	43046	TUBE, Oiler
4	22-8M0058389	PLUG KIT, Drain (Magnetic)
5	12-191833	SEAL
6	17-43044	PIN, Dowel - Without Hole (.375 x .625) (Rear)
7	31640T07	TRIM TAB
8	10-825427	SCREW, (.437-14 x 1.250) Stainless Steel
9	12-451761	WASHER, (.453 x .812 x .105) Black Oxide
10	43040T1	CARRIER ASSEMBLY
11	NSS	NOT SOLD SEPARATE, Needle Bearing
12	97-826134Q	ANODE
13	11-401386	NUT, (M6) Stainless Steel
14	10-4000333	SCREW, (M6 x 40)
15	NSS	NOT SOLD SEPARATE, Pinion Gear (12 Teeth) Comment: (High Altitude-2.33:1)(Component of 43-882813A 3
16	11-35921	NUT, (.625-18)
17	850307	CAM, Shift Control
18	31-883047A1	BEARING ASSEMBLY, Tapered Roller
19	15-44492A1	SHIM SET (006 Thru 048)
20	45-43032A4	DRIVESHAFT ASSEMBLY Comment: (X-Long-37 Inch)
21	42461A1	SLEEVE/RING KIT
22	NSS	NOT SOLD SEPARATE, Seal Ring
23	43055A4	COVER ASSEMBLY, Water Pump
24	27-430331	GASKET
25	27-8M0214931	GASKET
26	26-43036	SEAL, Oil (Lower)
27	26-43035	SEAL, Oil (Upper)
28	27-8172771	GASKET
29	817275A2	HOUSING KIT, Upper Water Pump
30	8M0204709	FACEPLATE
31	10-82684430	SCREW, (M6 x 30)
32	430232	SEAL
33	28-8M0204723	KEY
34	47-43026T2	IMPELLER
35	10-82684425	SCREW, (M6 x 25)
36	853908A1	SHIFT SHAFT ASSEMBLY Comment: (X-Long-17 Inch)
37	53-29641	E RING
38	23-43052A4	BUSHING ASSEMBLY
39	25-8M0204681	O-RING, (1.424 x .103)
40	26-8M0204708	SEAL, Oil
41	10-82684425	SCREW, (M6 x 25)
42	26-861415	FACE SEAL

▶Gear Housing, Propeller Shaft - 2.07:1 Gear Ratio (30 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	1667-9011G59	GEAR HOUSING ASSEMBLY, Basic
2	31-30894A1	BEARING SET, Cup And Cone
3	NSS	NOT SOLD SEPARATE, Cup
4	43-882813A3	GEAR KIT, Forward And Pinion 28 Teeth Comment: (High Altitude-2.33:1 Ratio)
5	31-30895T	BEARING, Needle
6	53-856823	RING, Retaining
7	850315A1	FOLLOWER KIT, Cam
8	30-44530	BALL
9	NSS	NOT SOLD SEPARATE, Slide
10	24-850327	SPRING
11	17-8M0100263	PIN, Cross
12	24-30893	SPRING
13	52-850048T	CLUTCH
14	44-8M0140445	PROPELLER SHAFT
15	43-882814T	GEAR, Reverse - 28 Teeth Comment: (High Altitude-2.33:1 Ratio)
16	8M0168901	CARRIER ASSEMBLY, Bearing
17	25-8M0214974	O-RING, (3.609 x .139)
18	31-30956T	BEARING, Needle
19	26-8M0205728	SEAL, Oil (Inner)
20	26-8M0205729	SEAL, Oil (Outer)
21	31-12578T	BEARING, Roller
22	12-12577	THRUST WASHER
23	31-12576	BEARING, Thrust
24	16-8M0034456	STUD, (M8 x 48)
25	12-855941	WASHER, (.323 x .590 x .112) Stainless Steel
26	11-401378	NUT, (M8)
27	15-44491A1	SHIM SET (006 Thru 038)
28	8227731	INSERT, Threaded
29	NSS	NOT SOLD SEPARATE, Decal-G/H Pinion Indent

▶Induction Manifold and Reed Block (43 parts)

Ref	OEM Part #	Part Name
-	17791T97	POWERHEAD ASSEMBLY
1	44325A1	COVER/PLATE KIT, Exhaust
2	NSS	NOT SOLD SEPARATE, Exhaust Plate
3	27-812775007	GASKET, Baffle Plate to Cylinder Block
4	27-812775006	GASKET, Exhaust Baffle to Exhaust Cover
5	10-82127335	SCREW, (M8 x 35 MM)
6	22-996642	FITTING, Elbow 90 Degree (.125-27 x .250) Nylon
7	42881A1	SHIFT RAIL ASSEMBLY
8	14-42981	TAB WASHER
9	10-40001134	SCREW, (M8 x 25)
10	988851	SLIDE
11	11-401386	NUT, (M6) Stainless Steel
12	12-35459	WASHER
13	11-401386	NUT, (M6) Stainless Steel
14	27-430075	GASKET
15	1169-858552T2	CAP ASSEMBLY, Lower End
16	21-426585	CHECK VALVE
17	26-419533	SEAL, Oil
18	25-89224	O-RING
19	10-4010825	SCREW, (M10 x 25) Hex Flange - Stainless Steel
20	22-13033	TEE FITTING
21	32-1430165	TUBING, (38.00 Inches Bulk) (Cut to 5.50 Inch Length)
22	22-130351	FITTING (Straight)
23	13545A1	MANIFOLD ASSEMBLY, Induction
24	827514	BRACKET
25	10-82127335	SCREW, (M8 x 35 MM)
26	10-81742740	SCREW, (M8 x 40)
27	16-8161949	STUD, (M6 x 44)
28	12-8M0204663	WASHER, (.187 x .500 x .062) Neoprene
29	11-816872	WING NUT
30	10-40001167	SCREW, (M8 x 110) (#4 Cylinder)
31	16-824470	STUD, (M8 x 1.25) (#1, 2, 3 Cylinder)
32	27-134612	GASKET
33	13460	COVER
34	10-81742755	SCREW, (M8 x 55)
35	8M0219198	REED BLOCK ASSEMBLY
36	NSS	NOT SOLD SEPARATE, Dowel Pin
37	27-139376	GASKET
38	34-43018A1	REED SET
39	14-429821	TAB WASHER
40	42924	RETAINER
41	10-88421471	SCREW, (M6 x 16)
42	37-804667A05	DECAL, EPA Label Information (2005)

▶Jet Pump Assembly (32 parts)

Ref	OEM Part #	Part Name
-	856143A1	JET PUMP ASSEMBLY
1	855767T90	HOUSING, Pump
2	878377	SHIFT LINKAGE KIT
3	878382	CAM
4	878380	GATE, Reverse - With Bumper
5	32-827490	HOSE, Lube
6	10-848497	SCREW, (.312-18 x 1.00)
7	16-855840	STUD, (.312-18 x 1.81)
8	11-82670910	NUT, (.312-18) Stainless Steel
9	85576890	HOUSING, Intake
10	855771	LINER
11	45-85576990	DRIVESHAFT
12	12-8796522	THRUST WASHER
13	30-8796531	BEARING, Ball
14	23-8271891	SLEEVE
15	11-8271901	NUT
16	808747	ADAPTOR, Pump
17	47-855708115	IMPELLER
18	12-36001	WASHER
19	28-801405875	KEY
20	15-801404875	SHIM, Impeller
21	14-801403875	TAB WASHER
22	17-801407	PIN, Dowel
23	10-19923062	SCREW, (.250-20 x .625)
24	10-60411	SCREW, (.312-18 x 1.250)
25	801410	BRACKET, Cable Support
26	11-82670910	NUT, (.312-18) Stainless Steel
27	10-4010860	SCREW, (M10 x 60) Hex Flange - Stainless Steel
28	10-4010890	SCREW, (M10 x 90) Hex Flange - Stainless Steel
29	10-4010870	SCREW, (M10 x 70) Hex Flange - Stainless Steel
30	10-843575	SCREW, (.375-16 x 4.00) Stainless Steel
31	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel

▶Jet Pump Components (8 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	817275A2	HOUSING KIT, Upper Water Pump Comment: (Lubricate/Sealant Application Points)
2	27-8172771	GASKET
3	8M0204709	FACEPLATE
4	10-82684430	SCREW, (M6 x 30)
5	430232	SEAL
6	28-8M0204723	KEY
7	47-43026T2	IMPELLER

▶Key Chart (1 parts)

Ref	OEM Part #	Part Name
-	8949112	KEY, Ignition (2F)

▶Lube Chart (0 parts)

▶Oil Injection Components (28 parts)

Ref	OEM Part #	Part Name
-	27-13461A99	GASKET SET
1	1278-8M0219217	TANK ASSEMBLY, Oil
2	828475A1	CAP
3	25-26318T	O-RING
4	828793	DIPSTICK
5	11-65110	NUT
6	19299A1	VENT ASSEMBLY
7	21-64871	VALVE
8	8287201	BRACKET
9	99160001	BOOT
10	10-4010620	SCREW, (M6 x 20) Stainless Steel
11	25-825380001	GROMMET
12	23-828350	BUSHING
13	12-4002318	WASHER
14	10-81893435	SCREW, (M8 x 35)
15	87-12886A6	SWITCH ASSEMBLY
16	10-58376	SCREW, (.164-18 x .375)
17	12-72761	WASHER, (.203 x .562 x .060) Stainless Steel
18	43-430204	GEAR, Driven
19	25-8M0204667	O-RING
20	17335A3	ADAPTOR ASSEMBLY
21	23-17597	BUSHING
22	23-17596	BUSHING
23	44345T3	PUMP, Oil
24	10-82104540	SCREW, (M5 x 40)
25	32-82381335	TUBING, (15.00 Inches Bulk) (Cut to 6.00 Inch Length)
26	32-82381455	TUBING, (25.00 Inches Bulk) (Cut to 11.00 Inch Length)
27	54-816311T	TIE STRAP, (8.00 Inches)

▶Power Trim Components (26 parts)

Ref	OEM Part #	Part Name
-	25-893914A02	O-RING KIT (Complete Trim)
1	8M0171821	SHOCK ROD KIT
2	25-8M0171819	O-RING KIT, Rebuild
3	8M0171822	PISTON ASSEMBLY, Memory
4	893916A01	CYLINDER ASSEMBLY
5	893905A02	VALVE KIT, Trim Limit
6	893906A02	PUMP ASSEMBLY
7	893907A02	MOTOR KIT
8	22-8134351	PLUG
9	893929A01	MANUAL RELEASE ASSEMBLY
10	893909A02	MANIFOLD KIT
11	10-809876A1	SCREW KIT (Motor)
12	88238A18	CABLE ASSEMBLY
13	809877A1	DRIVESHAFT/SEAL KIT
14	35-893912A02	FILTER KIT
15	893913A02	POPPET KIT
16	8M0207773	RELAY ASSEMBLY
17	23-8M0214955	BUSHING
18	25-818967	GROMMET
19	828102	BRACKET
20	NSS	NOT SOLD SEPARATE, Decal-Trim Relay
21	84-8M0092077	HARNESS ASSEMBLY, Trim
22	10-82129125	SCREW, (M6 x 25 MM)
23	54-22740	CLIP
24	10-878609	SCREW, (#10-16 x .600)
25	8M0084613	C WASHER

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
-	37-804667A06	DECAL, EPA Label Information (2006)

▶Starter Motor (8 parts)

Ref	OEM Part #	Part Name
-	50-893892T	STARTER MOTOR ASSEMBLY
1	15383	DRIVE KIT
2	13310T1	PINION ASSEMBLY
3	75660	PLATE
4	15384	THRU BOLT
5	15385	ARMATURE
6	898265016	BRUSH/SPRING KIT
7	15386001	END CAP

▶Steering Handle (37 parts)

Ref	OEM Part #	Part Name
-	12022A41	TILLER HANDLE KIT
NS	22-8M0169589	FITTING, Grease
1	12020A3	HANDLE ASSEMBLY, Steering Arm
2	23-42992T02	BUSHING
3	48414	HOUSING
4	48519	PLATE
5	27-48518	GASKET
6	10-878609	SCREW, (#10-16 x .600)
7	10-878608	SCREW, (#10-16 x .500)
8	54-889729	CLAMP
9	10-40007112	SCREW, (M5 x 40)
10	10-32,11-816874	WING NUT,
12	87-823609A15	SWITCH KIT, Stop - Throttle Handle
13	87-8M0104612	SWITCH ASSEMBLY, Stop
14	12018A4	TUBE ASSEMBLY, Throttle
15	NSS	NOT SOLD SEPARATE, Drive Wheel
16	NSS	NOT SOLD SEPARATE, Roll Pin
17	10-62568	SCREW, (#10-16 x .375)
18	8M0221732	GRIP
19	54-648551	CLAMP
20	11-40140	NUT, (M10)
21	8885242	CONDUIT
22	895663	GUIDE TUBE
23	89578	BARREL
24	10-32,10-824081	SET SCREW,
25	120191	CABLE ASSEMBLY
26	434332	GUIDE
27	20007	ANCHOR
28	8-32,10-8M0204644	SET SCREW,
29	10-823567105	SCREW, (M10 x 105) Hex Flange - Stainless Steel
30	48416	CAP
31	12-4002319	WASHER
32	12-12024	WASHER, (.402 x .787 x .039 Bellevi)
33	23-146011	SPACER
34	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel (Use Where Applicable)
35	54-816311T	TIE STRAP, (8.00 Inches)
36	NSS	NOT SOLD SEPARATE, Decal-Throttle

▶Steering Handle Components (43 parts)

Ref	OEM Part #	Part Name
-	12022A41	TILLER HANDLE KIT
1	12022A22	BRACKET ASSEMBLY
2	10-849838	SCREW, (.375-24 x 1.250)
3	11-8M0204726	NUT, (.375-24) Stainless Steel
4	16-8M0034421	STUD, (.3125 x 2.50)
5	822263	SPACER
6	12-8M0204690	WASHER, (.344 x .688 x .065) Stainless Steel
7	11-82670911	NUT, (.312-24) Stainless Steel
8	121051	GROMMET
9	84-12649A5	HARNESS ASSEMBLY
10	87-88107A5	SWITCH KIT, Key Comment: (See Key Chart for Keys)
11	11-879755	NUT, Special - Black Nylon Comment: (Black Nylon)
12	12015A1	COVER
13	10-878608	SCREW, (#10-16 x .500)
14	87-11083A4	SWITCH ASSEMBLY, Stop
15	15920Q54	LANYARD ASSEMBLY
16	8M0032846	RETAINER, Brass
17	10-4000358	SCREW, (M8 x 50)
18	14-42981	TAB WASHER
19	23-889732	BUSHING
20	12021A1	LEVER ASSEMBLY, Shift
21	12-815351	WASHER
22	NSS	NOT SOLD SEPARATE, Decal-Shift
23	16-8M0034452	STUD, (.375-24 x 1.125)
24	98530	KNOB
25	495636	SHIFT ROD
26	48419T	ROD END
27	23-26856	BUSHING
28	12-35950	WASHER, (.273 x .437 x .031) Stainless Steel
29	18-25191	COTTER PIN
30	12016A2	DETENT/SPRING KIT
31	NSS	NOT SOLD SEPARATE, Spring
32	87-14645A4	TRIM SWITCH (Power Trim)
33	49440	NUT, (.468-32) (Power Trim)
34	NSS	NOT SOLD SEPARATE, Decal-Trim Comment: (Component of 14645A 4 Trim Switch)
35	816051A2	HORN ASSEMBLY
36	84-11149A3	CABLE ASSEMBLY
37	84-86324A2	CABLE ASSEMBLY
38	824930T3	BRACKET Comment: (X-Long)
39	87-8M0052927	SWITCH Comment: (X-Long)
40	10-88075020	SCREW, (M3 x 20) Comment: (X-Long)
41	824923	PLATE Comment: (X-Long)
42	84-824934A3	HARNESS ASSEMBLY Comment: (X-Long)

▶Swivel Bracket and Steering Arm (19 parts)

Ref	OEM Part #	Part Name
1	1400-8M0220957	SWIVEL BRACKET
2	26-87735	SEAL, Oil, Lower
3	23-818764	BUSHING
4	25-8M0214926	O-RING
5	23-816039	SPACER
6	22-8M0169589	FITTING, Grease
7	23-821207	BUSHING
8	10-64014	SCREW, (.250-28 x .500)
9	12-816432	THRUST WASHER
10	99661A35	SWIVEL PIN ASSEMBLY
11	92876A12	LINK ROD ASSEMBLY
12	10-849838	SCREW, (.375-24 x 1.250)
13	11-8M0204726	NUT, (.375-24) Stainless Steel
14	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel
15	11-8M0204726	NUT, (.375-24) Stainless Steel
16	8M0000519	BUMPER
17	881914T01	YOKE, Bottom
18	53-67684	RING, Retaining
19	11288001	BUMPER, Bottom Yoke Comment: (X-Long)

▶Throttle Lever and Linkage (29 parts)

Ref	OEM Part #	Part Name
1	884309T	LEVER, Throttle
2	10-827009	SCREW, (M5 x 40)
3	826264	CAP
4	24-826382	SPRING
5	48039	CAP
6	884307T	LEVER, Spark Advance
7	10-814776	SCREW, Adjusting (M6 x 55)
8	11-400212	NUT, (M6) Stainless Steel
9	42942	CAP
10	10-4007180	SCREW, (M10 x 45)
11	23-55171	BUSHING
12	24-73375	SPRING
13	23-812930A1	BUSHING
14	NSS	NOT SOLD SEPARATE, Insert
15	12-42980	WASHER
16	42927	INSERT
17	12-35459	WASHER
18	11-401386	NUT, (M6) Stainless Steel
19	878170	ROD, Spark Advance
20	93421	SWIVEL BALL
21	93254	SWIVEL BASE
22	23-8M0215006	BUSHING
23	11-401386	NUT, (M6) Stainless Steel
24	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel
25	878173	LINK
26	23-8M0215006	BUSHING
27	14518A2	CAM ASSEMBLY, Throttle
28	16-8161949	STUD, (M6 x 44)
29	NSS	NOT SOLD SEPARATE, Decal-Idle Screw (Arrow-Down)

▶Tiller Handle Adapter Kit(Jet 80) (20 parts)

Ref	OEM Part #	Part Name
-	850000A3	TILLER HANDLE ADAPTOR KIT
1	832001A6	CABLE ASSEMBLY, Shift
2	11-401386	NUT, (M6) Stainless Steel
3	988851	SLIDE
4	828095	BRACKET
5	824930T3	BRACKET
6	54-8054441	CLIP
7	10-40011126	SCREW, (M6 x 13) Stainless Steel
8	828096	BLOCK, Shift Cable-Retaining
9	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
10	10-71958	SCREW, (.250-28 x 1.75)
11	13-26992	LOCKWASHER, (.250) Stainless Steel
12	828094	BLOCK, Shift Cable-Retaining
13	10-72734	SET SCREW, (#10-32 x .310)
14	12-35459	WASHER
15	11-35888	NUT, (.250-28) Stainless Steel
16	87-8M0052927	SWITCH
17	10-88075020	SCREW, (M3 x 20)
18	824923	PLATE
19	84-824934A1	CABLE ASSEMBLY

▶Tools(Special) (1 parts)

Ref	OEM Part #	Part Name
-	91-14310T1	WEAR SLEEVE INSTALLATION TOOL Comment: (Gear Housing)

▶Top Cowl (22 parts)

Ref	OEM Part #	Part Name
1	4026-828354A10	TOP COWL ASSEMBLY, Silver Cowl And Black Cap Comment: (Tracker)
2	828716A2	CAP
3	828352	SEAL
4	8283511	SEAL
5	821875F2	CAP, Upper Comment: (Silver)
6	819813T1	BRACKET, Cover Latch
7	893763	BRACKET ASSEMBLY, Latch Roller
8	13-53166	LOCKWASHER, (.312)
9	10-90285	SCREW, (.312-18 x .625)
10	F481434	GUIDE, Cowl Latch Bracket
11	11-91925	PUSH NUT
12	10-822512	SCREW, (.250-20 x 1.00)
13	19-823865	CAP PLUG
14	10-82130016	SCREW, (M6 x 16)
15	823830	SUPPORT
16	10-8231871	SCREW, (M4 x 14.5)
17	8,13-26995	LOCKWASHER, Stainless Steel
18	8233941	BRACKET
19	11-8237515	NUT, (M4)
20	823583A02	SOUND BLANKET KIT, (Pre-Applied Pressure Sensitive Adhesive)
21	NSS	NOT SOLD SEPARATE, Sound Blanket
22	47341A11	ROPE AND HANDLE KIT, Manual Starting

▶Transom Bracket (33 parts)

Ref	OEM Part #	Part Name
1	3426-828334T02	BRACKET, Transom (Starboard)
2	3425-828333T07	BRACKET ASSEMBLY, Transom (Port)
3	22-8M0169588	FITTING, Grease (Port)
4	826125A1	TILT TUBE (Stainless Steel)(Saltwater)
5	11-826135	NUT, (1.00-14) Nylon Insert (Stainless Steel)(Saltwater)
6	25-45711	O-RING, (.612 x .103)
7	13-88750	WASHER
8	11-826164	NUT, (.875-14) (Brass)(Saltwater)
9	10-8M0149747	SCREW, (.500-20 x 4.500)
10	12-8M0204665	WASHER, (.530 x .870 x .105) Stainless Steel
11	12-8M0204648	WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
12	11-82671117	NUT, (.500-20)
13	24-830899	SPRING, Tension
14	8M0109798	LEVER ASSEMBLY, Tilt Lock
15	23-65830	NYLINER
16	24-830900	SPRING, Compression
17	99633	KNOB
18	17-99615	PIN, Groove
19	17-893709	PIN
20	8M0086406	BRACKET, Anchor
21	10-858771	SCREW, (M10 x 30)
22	12-4002319	WASHER
23	11-40114	NUT, (M10 x 1.5)
24	97-818298Q1	ANODE
25	10-8M0204707	SCREW, (M6 x 25)
26	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
27	54-22740	CLIP
28	8M0084613	C WASHER
29	10-878609	SCREW, (#10-16 x .600)
30	8M0171818	PUMP ASSEMBLY, Power Trim Comment: (See Power Trim Components section for parts breakdown)
31	99625002	SHAFT (Upper)
32	17-818898	PIN, Anchor
33	17-821539	PIN, Trilobe

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 125 (4 CYL.) 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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