Mercury 50 BIGFOOT (4-STROKE) (0G760300 THRU 0T178499) Parts & Diagrams

🔎 Mercury 50 BIGFOOT (4-STROKE) Reference Library — Exploded parts diagrams (33 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 50 BIGFOOT (4-STROKE) is a 4-Stroke, Inline 4-Cylinder, EFI, SOHC outboard motor. Commonly used on jon boats, pontoons, and mid-size utility craft.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, Inline 4-Cylinder, EFI, SOHC
Horsepower	50 HP
Displacement	995 cc
Bore x Stroke	65 mm x 75 mm
Spark Plug (Type & Gap)	NGK IZFR6F-11
Engine Oil Capacity	3.0 L (3.17 quart)
Recommended Engine Oil	SAE 25W-40 Mercury FourStroke Oil
Gear Case Oil Capacity	440 mL (14.9 fl oz)
Idle Speed (in gear)	650 ± 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 50 BIGFOOT (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 50 BIGFOOT (4-STROKE).

▶Accessories (1 parts)

Ref	OEM Part #	Part Name
0	816667A2	BRACKET ASSEMBLY, Steering, Without Carrying Handle

▶Adaptor Plate (28 parts)

Ref	OEM Part #	Part Name
1	8M0162935	DIPSTICK
2	825989003	DIPSTICK TUBE
3	8560552	SEAL
4	8289151	HEAT SHIELD
5	17-23784	PIN, Dowel
6	22-629101	FITTING, Elbow - 90 Degree (.125-27)
7	54-816311T	TIE STRAP, (8.00 Inches)
8	32-77653101	HOSE, (48.00 Inches Bulk), Cut to 20 Inches
9	26-16977	SEAL, Oil Comment: Bigfoot
10	22-384073	PLUG, Pipe
11	25-822408001	GROMMET Comment: Non Bigfoot
12	825228A24	ADAPTOR PLATE
13	27-8M0213113	GASKET
14	25-845746	O-RING
15	893765	PLATE, Oil Pickup-Top
16	32-854793	HOSE, Oil Pickup
17	893700	BAFFLE
18	54-855228	CLAMP
19	23-856743	BUSHING Comment: Non Bigfoot
20	25-19565002	GROMMET Comment: Power Trim
21	25-8M0179867	GROMMET Comment: Non Power Trim
22	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
23	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
24	856592	DEFLECTOR, Oil
25	8M0210772	BODY, Oil Pressure Relief
26	18-45882	COTTER PIN
27	8252151	PLUNGER
28	24-825216	SPRING

▶Bottom Cowl (20 parts)

Ref	OEM Part #	Part Name
1	4020-826277T2	BOTTOM COWL Comment: Port-Gray
2	4020-826278T4	BOTTOM COWL Comment: Starboard-Gray
3	10-82684430	SCREW, (M6 x 30)
4	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
5	825238002	SEAL
6	10-82684460	SCREW, (M6 x 60)
7	27-855627	GASKET
8	22-827948	FITTING
9	12-855576	WASHER
10	826273001	BOOT
11	54-816311T	TIE STRAP, (8.00 Inches)
12	10-1993716	SCREW, (M6 x 16)
13	893766	LATCH HOOK
14	13-12134	WASHER, Wave
15	23-812707	BUSHING
16	13-12134	WASHER, Wave
17	825782F2	LEVER, Cowl Latch Comment: Gray
18	812830T01	PLUG Comment: Non-Power Trim
19	87-8M0042301	SWITCH ASSEMBLY Comment: Power Trim
20	13541	PLUG, Male Comment: Handle

▶Camshaft/Oil Pump (24 parts)

Ref	OEM Part #	Part Name
-	825034A17	CYLINDER HEAD ASSEMBLY
1	17-825087	PIN, Included with Cylinder Block
2	24-825088	SPRING
3	824796A1	TENSIONER ASSEMBLY
4	10-81893420	SCREW, (M8 x 20)
5	10-826165	SCREW
6	23-850522	SPACER
7	834838	LOAD RING
8	12-825082	WASHER
9	825083T	GEAR, Drive
10	28-893761	KEY
11	825109	BELT
12	10-82761140	SCREW, (M10 x 40)
13	12-4002319	WASHER
14	825108	GEAR, Driven
15	26-825048	SEAL, Oil
16	17-825956	PIN, Dowel
17	2407-8250471	CAMSHAFT
18	17-826149	PIN
19	825058A1	PUMP ASSEMBLY, Oil
20	25-826152	O-RING
21	25-826154	O-RING
22	25-826153	O-RING
23	10-4000333	SCREW, (M6 x 40)

▶Carburetor Linkage (37 parts)

Ref	OEM Part #	Part Name
1	828524	DIAPHRAGM
2	809587	JOINT
3	10-827480M	SCREW
4	32-80960110	PIPE
5	32-80960120	PIPE Comment: Quantity of 2 with carburetor with adjustable pilot screw. Quantity of 1 with carburetor with non-adjustable pilot screw
6	32-809601	PIPE
7	32-80960130	PIPE
8	8095975	ROD, Choke
9	11829M	RETAINER
10	12-809606	WASHER
11	809597	ROD, Choke
12	8095974	ROD, Choke
13	25-809608	COLLAR
14	8095981	JOINT
15	8095972	ROD, Choke
16	8095971	ROD, Choke
17	10-80959910	SCREW
18	809607	DAMPER, Throttle
19	24-8096021	SPRING
20	8095973	ROD, Choke
21	8096001	LEVER, Starter
22	809600	LEVER, Starter
23	12-82207M	WASHER
24	10-8095992	SCREW
25	12-82211M	WASHER
26	10-8095991	SCREW
27	825106T	AUTO START ASSEMBLY
28	97685T	SOLENOID
29	855531	COVER
30	827631	BRACKET Comment: Included with 825105A1 on Intake
31	10-809599	SCREW
32	11-809604	NUT
33	12-80960610	WASHER
34	809605	WIRE PULL
35	24-8096022	SPRING
36	809603	PLATE
37	10-8095993	SCREW

▶Carburetor(40/50) (46 parts)

Ref	OEM Part #	Part Name
-	809594A1	REPAIR KIT, Carburetor Comment: (One Kit per Carburetor)
1	3319-825073T11	CARBURETOR (1)
2	3319-825073T12	CARBURETOR (2)
3	3319-825073T13	CARBURETOR (3)
4	3319-825073A14	CARBURETOR (4)
5	10-809571	SCREW, (M4 x 10)
6	809572	COVER (1)
7	809573	GASKET
8	12-826943M	WASHER (1/2/3)
9	24-8095791	SPRING (1/2/3)
10	10-8095781	SCREW, Throttle (1/2/3)
11	12-809580	WASHER
12	53-94722M	RING, Retaining
13	809582	LEVER (1)
14	13-92515M	LOCKWASHER (1)
15	11-809581	NUT (1)
16	809570	NEEDLE VALVE
17	10-8095711	SCREW, (M4 x 5)
18	809574	MAIN NOZZLE
19	25-11802M	O-RING
20	809577	MAIN NOZZLE
21	44,8095761	JET, Pilot
22	112,809575	JET, Main
23	809569	FLOAT
24	17-11794M	PIN
25	27-809568	GASKET
26	809567	BODY (1/2/3)
27	10-81758M	SCREW, (M4 x 12)
28	10-8095783	SCREW, Drain (M5 x 6)
29	27-8095681	GASKET
30	8095721	COVER (2)
31	53-809584	CLIP (2)
32	809585	ROLLER (2)
33	8095721	COVER (3)
34	11829M	RETAINER (4)
35	809586	ROD, Starter (4)
36	809587	JOINT (4)
37	10-8095781	SCREW, Throttle (4)
38	24-8095791	SPRING (4)
39	8095721	COVER (4)
40	10-8095712	SCREW (4)
41	12-8095801	WASHER (4)
42	8095821	LEVER (4)
43	10-826931M	SCREW (4)
44	8095671	BODY (4)
45	19-855237	PLUG, Metal

▶Carburetor(45) (50 parts)

Ref	OEM Part #	Part Name
-	809594A1	REPAIR KIT, Carburetor Comment: (One Kit per Carburetor)
1	3319-825073A6	CARBURETOR (1)
2	3319-825073A7	CARBURETOR (2)
3	3319-825073A8	CARBURETOR (3)
4	3319-825073T9	CARBURETOR (4)
5	10-809571	SCREW, (M4 x 10)
6	809572	COVER (1)
7	809573	GASKET
8	26-827737	SEAL, Rubber
9	10-8095784	SCREW SET, Pilot
10	25-809124M	O-RING
11	24-809579	SPRING, Air Adjusting
12	12-826943M	WASHER (1/2/3)
13	24-8095791	SPRING (1/2/3)
14	10-8095781	SCREW, Throttle (1/2/3)
15	12-809580	WASHER
16	53-94722M	RING, Retaining
17	809582	LEVER (1)
18	13-92515M	LOCKWASHER (1)
19	11-809581	NUT (1)
20	8095701	VALVE, Needle
21	10-8095711	SCREW, (M4 x 5)
22	8095741	MAIN NOZZLE
23	25-11802M	O-RING
24	809577	MAIN NOZZLE
25	42,8095761	JET, Pilot
26	104,8095751	JET, Main (1/2)
27	103,8095752	JET, Main (3/4)
28	809569	FLOAT
29	17-11794M	PIN
30	27-809568	GASKET
31	809567	BODY (1/2/3)
32	10-81758M	SCREW, (M4 x 12)
33	10-8095783	SCREW, Drain (M5 x 6)
34	27-8095681	GASKET
35	8095721	COVER (2)
36	53-809584	CLIP (2)
37	809585	ROLLER (2)
38	8095721	COVER (3)
39	11829M	RETAINER (4)
40	809586	ROD, Starter (4)
41	809587	JOINT (4)
42	10-8095781	SCREW, Throttle (4)
43	24-8095791	SPRING (4)
44	8095721	COVER (4)
45	10-8095712	SCREW (4)
46	12-8095801	WASHER (4)
47	8095821	LEVER (4)
48	10-826931M	SCREW (4)
49	8095671	BODY (4)

▶Crankshaft/Pistons and Connecting Rods (13 parts)

Ref	OEM Part #	Part Name
-	27-832013A96	GASKET SET
1	2406-831279A2	CRANKSHAFT Comment: Bigfoot
2	8M0151047	SEAL
3	8M0151048	SEAL
4	600-893530T01	CONNECTING ROD
5	10-8M0049884	BOLT
6	23-893630002	BEARING, Blue
7	2715-825011A2	PISTON ASSEMBLY Comment: .5MM Oversize
8	39-8250121	RING, Piston, Top Comment: .5 MM Oversize
9	NSS	NOT SOLD SEPARATE, Piston Ring - Second
10	39-825015	RING, Oil
11	41-893863	PIN, Piston
12	40-825017	RETAINER

▶Cylinder Block (23 parts)

Ref	OEM Part #	Part Name
-	27-832013A96	GASKET SET
1	892-824955T8	CYLINDER BLOCK
2	17-825010	PIN, Dowel
3	22-479452	PLUG
4	NSS	NOT SOLD SEPARATE, Pipe Plug (1/4-14)
5	NSS	NOT SOLD SEPARATE, Pipe Plug (3/4-14)
6	23-893631002	BEARING, Blue
7	10-82506182	SCREW, (M8 x 82)
8	10-8M0205943	SCREW, (M6 x 35)
9	27-8M0213112	GASKET
10	35-8M0162830	FILTER ASSEMBLY, Oil
11	822625	NIPPLE, (M20)
12	27-8M0058361	GASKET
13	825030A1	COVER ASSEMBLY, Exhaust
14	22-479452	PLUG
15	855676003	THERMOSTAT
16	27-8M0177107	GASKET
17	8M0188835	COVER
18	10-8M0205943	SCREW, (M6 x 35)
19	32-8M0108349	TUBING, (28.00 Inches Bulk), Cut to 11 Inches
20	54-816311T	TIE STRAP, (8.00 Inches)
21	22-996642	ELBOW
22	NSS	NOT SOLD SEPARATE, Plug-Serial Number

▶Cylinder Head (32 parts)

Ref	OEM Part #	Part Name
-	825034A17	CYLINDER HEAD ASSEMBLY
1	825034A9	CYLINDER HEAD ASSEMBLY
2	10-83124714	BOLT
3	12-831246	WASHER, Sealing
4	8M0054272	GUIDE
5	53-825038	CIRCLIP
6	10-84088M	SCREW, (M6 x 10)
7	27-827610	GASKET
8	826887M	ANODE
9	25-825040	GROMMET
10	826888M	COVER
11	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
12	10-827607	BOLT
13	10-4005785	SCREW, (M4 x 10)
14	825055	COVER
15	25-825056	O-RING
16	8250534	COVER Comment: SN# 0G960499 & Below
17	22-825054	BREATHER PIPE
18	10-8M0204741	SCREW, (M6 x 20) Stainless Steel
19	27-825032	GASKET
20	17-825010	PIN, Dowel
21	10-893745025	SCREW, (M6 x 25)
22	10-82503395	SCREW, (M9 x 95)
23	27-827610	GASKET
24	826060	DIAPHRAGM
25	828528	BRACKET Comment: Non Handle
26	830294T1	BRACKET Comment: Handle
27	10-40011126	SCREW, (M6 x 13) Stainless Steel
28	22-629101	FITTING, Elbow - 90 Degree (.125-27)
29	8266241	CLAMP
30	859578A1	PLUG
31	25-8M0052669	O-RING

▶Driveshaft Housing (26 parts)

Ref	OEM Part #	Part Name
1	42941001	SEAL, Water Tube
2	3532-825218T6	HOUSING ASSEMBLY, Driveshaft Comment: Non Bigfoot-Gray
3	1503-852421T4	HOUSING ASSEMBLY, Driveshaft Comment: Bigfoot-Gray
4	825220T06	PIPE, Exhaust
5	893770	PLATE Comment: Bigfoot
6	10-1993325	SCREW, (M10 x 25 MM) Comment: Bigfoot
7	10-824459110	SCREW, (M8 x 110) Stainless Steel
8	10-88960845	SCREW, (M8 x 45)
9	8M0043364	BUMPER
10	8288181	PLUG, Drain
11	27-8M0204692	GASKET
12	826276	BUMPER
13	8M0151042	GROMMET
14	16-903501	STUD, (M10 x 100) Comment: Bigfoot
15	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel
16	11-40140	NUT, (M10)
17	32-897971A01	TUBE, Water
18	54-828529	GUIDE
19	10-4000380	SCREW, (M10 x 45) Comment: Bigfoot
20	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel Comment: Bigfoot
21	22-85822A7	SPEEDOMETER PICK UP Comment: Bigfoot
22	22-85822T	CONNECTOR, Straight Comment: Bigfoot
23	22-8M0181450	FITTING Comment: Bigfoot
24	23-813745	SPACER Comment: Bigfoot
25	43585	COUPLING Comment: Bigfoot
26	23-855623	BUSHING Comment: Bigfoot

▶Electrical Components (33 parts)

Ref	OEM Part #	Part Name
-	61-822775T98	POWERHEAD ASSEMBLY Comment: Bigfoot
1	10-82684425	SCREW, (M6 x 25)
2	8250983	CONTROLLER ASSEMBLY, Electric Comment: 45 Bodensee
3	8347912	BRACKET Comment: Non-Bigfoot SN# 0G960499 & Below
4	8347913	BRACKET Comment: Bigfoot SN# 0G960499 & Below
5	10-81893435	SCREW, (M8 x 35)
6	825074	SOLENOID PLATE
7	10-8248324	SCREW, (M6 x 16)
8	11-401386	NUT, (M6)
9	825096T01	SOLENOID
10	8M0010250	BRACKET
11	825076	REGULATOR, Voltage
12	10-8248326	SCREW, (M6 x 25 MM)
13	87-8M0098207	PRESSURE SWITCH
14	815004M	PLATE
15	87-8280391	TEMPERATURE SWITCH
16	87-857122	TEMPERATURE SWITCH
17	10-40011126	SCREW, (M6 x 13) Stainless Steel
18	25-82069M	GROMMET
19	84-825102A1	HIGH TENSION LEAD
20	33-827858Q	SPARK PLUG, NGK-DPR6EA-9
21	339-825101T	COIL ASSEMBLY, Ignition, Includes Lead Wires
22	10-82684430	SCREW, (M6 x 30)
23	NSS	NOT SOLD SEPARATE, Decal-Coil Identification
24	84-827350A3	HARNESS ASSEMBLY, Engine Wiring
25	88-812619	FUSE, Yellow - 20 Ampere
26	10-40011126	SCREW, (M6 x 13) Stainless Steel Comment: Bigfoot
27	10-40011126	SCREW, (M6 x 13) Stainless Steel
28	54-816311T	TIE STRAP, (8.00 Inches)
29	84-88439A4	CABLE ASSEMBLY, Battery - Negative
30	85-79695T	BOOT, Insulator - Black
31	84-88439A9	CABLE ASSEMBLY, Battery - Positive
32	84-86232A4	HARNESS ASSEMBLY, Auxiliary Comment: Handle

▶Flywheel (21 parts)

Ref	OEM Part #	Part Name
-	61-822775T98	POWERHEAD ASSEMBLY Comment: Bigfoot
1	825093	COVER
2	25-8M0153609	GROMMET
3	32-9912878	HOSE, (.187) (26.00 Inches Bulk), Cut to 19 Inches
4	25-45507	GROMMET
5	11-893789	NUT
6	12-893762	WASHER
7	280-825090A2	FLYWHEEL
8	NSS	NOT SOLD SEPARATE, Decal-Warning-Spinning Flywheel
9	10-82494825	SCREW, (M6 x 25)
10	398-8250891	STATOR
11	825110	BASE, Stator
12	10-8248326	SCREW, (M6 x 25 MM)
13	17-825010	PIN, Dowel
14	28-8261001	KEY
15	826061	COIL, Pulser
16	10-82104510	SCREW, (M5 x 10)
17	NSS	NOT SOLD SEPARATE, Decal-Warning-Neutral
18	NSS	NOT SOLD SEPARATE, Decal-Engine Oil/Valve Clearance
19	37-804655A00	DECAL, EPA Label Information Comment: (2000)
20	NSS	NOT SOLD SEPARATE, Decal-Laminate Overlay

▶Fuel Pump (23 parts)

Ref	OEM Part #	Part Name
-	27-832013A96	GASKET SET
1	826398T3	PUMP ASSEMBLY, Fuel
2	10-809564	SCREW, (M5 x 35)
3	809565	COVER
4	8095611	DIAPHRAGM
5	10-41889M	SCREW, (M3 x 5)
6	11-82537M	NUT
7	21-41888M	CHECK VALVE
8	8095612	DIAPHRAGM
9	17-8095661	PIN
10	24-809562	SPRING
11	11-82388M	NUT, (M5)
12	24-8095621	SPRING
13	8095631	PLUNGER
14	25-8M0052669	O-RING
15	10-82684430	SCREW, (M6 x 30)
16	54-8M0024808	J CLIP
17	22-8M0148585	CONNECTOR ASSEMBLY, Fuel
18	32-8M0108355	HOSE, (57.00 Inches Bulk), Cut to 19 Inches
19	32-8M0108355	HOSE, (57.00 Inches Bulk), Cut to 16 Inches
20	54-816311T	TIE STRAP, (8.00 Inches)
21	35-816296Q03	FILTER, Fuel
22	8M0007776	DEFLECTOR, Cowl

▶Gear Housing, Driveshaft - 1.83:1 Gear Ratio - Non Bigfoot (39 parts)

Ref	OEM Part #	Part Name
-	821354A2	REPAIR KIT, Water Pump
1	1682-821306T13	GEAR HOUSING ASSEMBLY, Basic Comment: Gray
2	818226A1	SEAL/PLATE KIT
3	NSS	NOT SOLD SEPARATE, Plate
4	10-79953Q04	SCREW KIT, (.375-16 x .250)
5	12-191833	WASHER, Fiber
6	22-8M0058389	FITTING KIT, Magnetic, Plug Fill/Drain
7	12-191833	WASHER, Fiber
8	11-55910	NUT, (.437-20)
9	43-822161T2	GEAR, Pinion (12 Teeth
10	31-821321A2	BEARING ASSEMBLY
11	NSS	NOT SOLD SEPARATE, Cup
12	10-8248324	SCREW, (M6 x 16)
13	46-821351A3	HOUSING ASSEMBLY, Water Pump Upper
14	8235471	SEAL
15	12-866451	WASHER
16	28-8M0214993	KEY
17	12-866451	WASHER
18	27-822189	GASKET, Upper Water Pump
19	27-8M0214956	GASKET, Lower Water Pump
20	8213542	FACE PLATE
21	47-8M0204712	IMPELLER
22	46-821307A2	BASE ASSEMBLY, Water Pump
23	26-821309	SEAL
24	26-821310	SEAL
25	25-821308	O-RING, (1.421 x .139)
26	45-826194A1	DRIVESHAFT
27	30-821311	BEARING, Ball
28	823548T	TIE STRAP
29	822158	BOOT
30	821827	RETAINER
31	25-26855	O-RING, (1.609 x .139)
32	25-85594	O-RING, (.239 x .174)
33	12-814803	WASHER
34	827865A1	SHIFT SHAFT
35	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
36	17-85593	PIN, (.078 x .437)
37	8213161	CAM, Shift
38	17-822369	PIN, (.125 x .625)

▶Gear Housing, Propeller Shaft - 1.83:1 GearRatio-Non Bigfoot (37 parts)

Ref	OEM Part #	Part Name
-	823547A2	SEAL KIT
1	1682-821306T13	GEAR HOUSING ASSEMBLY, Basic Comment: Gray
39	17-821327	PIN, Dowel
40	27-823942	GASKET
41	32-8M0026108	TUBE
42	19-824928001	PLUG, Rubber
43	821829	SCREEN
44	822157T2	TRIM TAB
45	10-82497020	SCREW, (M8 x 20)
46	12-72397	WASHER
47	43-822162T2	GEAR, Forward, 22 Teeth
48	31-8M0103470	BEARING ASSEMBLY, Roller
49	NSS	NOT SOLD SEPARATE, Cup
50	31-41326	BEARING, Roller
51	821578	FOLLOWER, Cam
52	24-8261991	SPRING
53	17-8M0020999	PIN
54	52-821314T	CLUTCH
55	24-38114	SPRING
56	44-8M0140441	PROPELLER SHAFT
57	43-822163T1	GEAR, Reverse, 22 Teeth
58	30-20839T	BEARING, Ball
59	8M0168900	CARRIER ASSEMBLY, Bearing
60	25-815460	O-RING
61	31-21700	BEARING, Needle
62	26-8M0205511	SEAL, Oil
63	26-8M0203757	SEAL, Oil
64	12-855941	WASHER, (.323 x .590 x .112) Stainless Steel
65	10-85594030	SCREW, (M8 x 30)
66	8227731	INSERT, Threaded
67	NSS	NOT SOLD SEPARATE, Decal-Gear Ratio
68	73345A1	THRUST HUB
69	11-69578Q1	PROP NUT KIT
70	14-8M0214942	TAB WASHER
71	10-4000380	SCREW, (M10 x 45)
72	12-8M0214963	WASHER, (.406 x .750 x .105) Stainless Steel
73	19-95925	PLUG

▶Gearhousing, Driveshaft - 2.31:1 Gear Ratio - Bigfoot (42 parts)

Ref	OEM Part #	Part Name
-	46-8M0113799	REPAIR KIT, Water Pump
1	1667-9011G60	GEAR HOUSING ASSEMBLY, Basic Comment: Gray
2	17-8M0084244	PIN, Dowel - With Hole (.375 x .625) , Front
3	10-79953Q04	SCREW KIT, (.375-16 x .250)
4	22-8M0058389	FITTING KIT, Magnetic, Plug Fill/Drain
5	12-191833	WASHER, Fiber
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, Bearing-Needle
12	43046	TUBE, Oiler
13	97-826134Q	ANODE
14	10-4000333	SCREW, (M6 x 40)
15	11-401386	NUT, (M6)
16	43-44484T	GEAR, Pinion (13 Teeth)
17	11-35921	NUT, (.625-18)
18	850307	CAM, Shift Control
19	31-42677A1	BEARING ASSEMBLY, Tapered Roller
20	15-44492A1	SHIM SET
21	45-854808A1	DRIVESHAFT ASSEMBLY
22	42461A1	SLEEVE/RING KIT
23	43055A4	COVER ASSEMBLY, Water Pump
24	27-8M0214931	GASKET
25	26-43036	SEAL, Oil, Lower
26	26-43035	SEAL, Oil, Upper
27	27-430331	GASKET
28	27-8172771	GASKET Comment: SN# 0G960499 & Below
29	817275A2	HOUSING KIT, Upper Water Pump
30	8M0204709	FACEPLATE
31	10-8M0214957	SCREW, (M6 x 30)
32	8M0204658	SEAL
33	28-8M0204723	KEY
34	47-43026T2	IMPELLER
35	10-8248326	SCREW, (M6 x 25 MM)
36	853906A1	SHIFT SHAFT ASSEMBLY
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	10-8248326	SCREW, (M6 x 25 MM)

▶Gearhousing, Propeller Shaft - 2.31:1 Gear Ratio-Bigfoot (31 parts)

Ref	OEM Part #	Part Name
-	26-43035A4	SEAL KIT, Gear Housing
1	1667-9011G60	GEAR HOUSING ASSEMBLY, Basic Comment: Gray
42	43-859472A3	GEAR KIT, Forward, 30 Teeth
43	15-44491A1	SHIM SET
44	31-30894A1	BEARING SET, Cup And Cone
45	NSS	NOT SOLD SEPARATE, Cup
46	31-30895T	BEARING, Needle
47	850315A1	FOLLOWER KIT, Cam
48	30-44530	BALL
49	NSS	NOT SOLD SEPARATE, Slide
50	24-850327	SPRING
51	52-850048T	CLUTCH
52	17-8M0100263	PIN, Cross
53	24-30893	SPRING
54	44-8M0140445	PROPELLER SHAFT
55	43-850034T	GEAR, Reverse (30 Teeth)
56	8M0168901	CARRIER ASSEMBLY, Bearing
57	25-8M0214974	O-RING, (3.609 x .139)
58	31-30956T	BEARING, Needle
59	26-8M0205728	SEAL, Oil, Inner
60	26-8M0205729	SEAL, Oil, Outer
61	31-12578T	BEARING, Needle
62	12-12577	THRUST WASHER
63	31-12576	BEARING, Thrust
64	16-8M0034456	STUD, (M8 x 48)
65	12-855941	WASHER, (.323 x .590 x .112) Stainless Steel
66	11-401378	NUT, (M8)
67	NSS	NOT SOLD SEPARATE, Insert-Threaded
68	NSS	NOT SOLD SEPARATE, Decal-Gear Ratio
69	11-52707Q1	PROP NUT KIT, (.750-16)
70	14-816629Q	TAB WASHER

▶Intake (36 parts)

Ref	OEM Part #	Part Name
-	809594A1	REPAIR KIT, Carburetor Comment: (One Kit per Carburetor)
1	10-8248326	SCREW, (M6 x 25 MM)
2	25-8250572	O-RING
3	827579	INSULATOR
4	19-827633	PLUG
5	825077	JOINT, Carburetor
6	17-23784	PIN, Dowel
7	25-826156	O-RING
8	25-8250572	O-RING
9	25-826157	O-RING
10	25-809596	GROMMET
11	54-816311T	TIE STRAP, (8.00 Inches)
12	32-822674	BREATHER PIPE
13	54-827612	CLAMP
14	23-17044M	BUSHING
15	10-82615890	SCREW, (M6 x 90)
16	10-82684430	SCREW, (M6 x 30)
17	23-827578	COLLAR
18	825105A1	SILENCER ASSEMBLY, Intake
19	56762	TIE STRAP, (4.00 Inches)
20	13540	CAP, Female
21	54-98974M	CLIP
22	32-826568	HOSE
23	22-97083M	TEE FITTING
24	32-11840M	HOSE
25	32-826563	HOSE
26	54-98974M	CLIP
27	32-826565	HOSE
28	32-826566	HOSE, Fuel
29	54-811261M	CLAMP
30	22-828527	CONNECTOR
31	32-11840M	HOSE
32	32-828525	HOSE
33	54-814967M	CLIP, Use where Applicable
34	NSS	NOT SOLD SEPARATE, Decal-Servicing Referral
35	37-881865	DECAL, Caution, Start In Gear

▶Intake/Exhaust Valves (17 parts)

Ref	OEM Part #	Part Name
-	825034A17	CYLINDER HEAD ASSEMBLY
1	8M0119204	VALVE, Exhaust
2	822648	VALVE, Intake
3	12-825044	WASHER, Valve Spring
4	26-822647	SEAL, Valve Stem
5	24-823678	SPRING, Valve Outer
6	822650	RETAINER
7	28-893554	KEY
8	898821A01	ROCKER ARM
9	10-825046	SCREW
10	11-826150	NUT
11	825049	SHAFT, Rocker
12	825050	BRACKET
13	825051	PLATE
14	24-825052	SPRING
15	10-82641030	SCREW, (M8 x 30)
16	19-825042	PLUG

▶Linkage, Bigfoot (26 parts)

Ref	OEM Part #	Part Name
1	10-40011158	SCREW, (M8 x 70) Stainless Steel
2	10-814776	SCREW, Adjusting (M6 x 55)
3	11-401196	NUT, (M6)
4	42942	CAP
5	826587	RETAINER
6	822682A4	LEVER, Throttle
7	23-825078	BUSHING
8	822459	RETAINER
9	8259571	LEVER, Shift
10	827706A4	BRACKET
11	98889	LATCH
12	10-8248324	SCREW, (M6 x 16)
13	23-15885	SLEEVE
14	893777	SHIFT ROD
15	8501631	GUIDE, Shift Rod
16	893769A01	SHIFT LINK
17	23-48475	BUSHING
18	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
19	11-401386	NUT, (M6)
20	18-210711	COTTER PIN
21	850166T2	LEVER ASSEMBLY, Shift Shaft Comment: SN# 0G960499 & Below
22	23-850165	BUSHING
23	8262311	CAM
24	23-309772	SPACER
25	12-4002314	WASHER
26	10-40056107	SCREW, (M5 x 16)

▶Linkage, Non-Bigfoot (29 parts)

Ref	OEM Part #	Part Name
1	10-40011158	SCREW, (M8 x 70) Stainless Steel
2	10-814776	SCREW, Adjusting (M6 x 55)
3	11-401196	NUT, (M6)
4	42942	CAP
5	826587	RETAINER
6	822682A4	LEVER, Throttle
7	23-825078	BUSHING
8	822459	RETAINER Comment: Non-Handle
9	8259571	LEVER, Shift Comment: Non-Handle
10	827706A4	BRACKET Comment: Non-Handle
11	98889	LATCH Comment: Non-Handle
12	10-8248324	SCREW, (M6 x 16) Comment: Non-Handle
13	23-15885	SLEEVE Comment: Non-Handle
14	882820	SHIFT ROD Comment: Non-Handle
15	8262312	CAM, Throttle Comment: 40 Italian
16	23-309772	SPACER
17	12-4002314	WASHER
18	10-40056107	SCREW, (M5 x 16)
19	826588A4	SHIFT SHAFT ASSEMBLY, Horizontal
20	8277071	RETAINER
21	12-8M0214930	WASHER
22	18-210711	COTTER PIN
23	24-826077	SPRING, Detent
24	24-824993	SPRING, Backing
25	824994	SPRING, Plate
26	10-40011107	SCREW, (M5 x 16) Stainless Steel
27	87-8M0052927	SWITCH Comment: Handle Models
28	10-88075020	SCREW, (M3.5 x 20) Stainless Steel Comment: Handle Models
29	824923	PLATE Comment: Handle Models

▶Manual Tilt Components (14 parts)

Ref	OEM Part #	Part Name
-	25-893922A01	O-RING KIT
1	8M0118572	SHOCK ROD ASSEMBLY
2	893903A01	PISTON ASSEMBLY, Trim Memory
3	25-893917A01	O-RING KIT, Cylinder
5	893918A01	CYLINDER ASSEMBLY
6	893919A01	SCREW AND SEAL KIT
7	893920A01	ACCUMULATOR ASSEMBLY
8	893921A01	VALVE BODY ASSEMBLY
9	893923A01	CAM KIT
10	893924A01	VALVE KIT, Velocity
11	893925A01	REPAIR KIT
12	8M0207768	CABLE ASSEMBLY, Ground
13	17-19607	PIN
14	17-821539	PIN, Trilobe

▶Power Trim Components (28 parts)

Ref	OEM Part #	Part Name
-	84-826802A15	HARNESS/RELAY ASSEMBLY
1	855833	SHOCK ROD KIT Comment: Bigfoot SN# BEL-0P040441 & Below
2	8M0171822	PISTON ASSEMBLY, Memory
3	25-8M0171819	O-RING KIT, Rebuild
5	893904T01	CYLINDER ASSEMBLY
6	893944A01	VALVE KIT, Trim Limit Comment: Bigfoot
7	893906A02	PUMP ASSEMBLY
8	893907A02	MOTOR KIT
9	22-8134351	PLUG
10	893929A01	MANUAL RELEASE ASSEMBLY
11	893909A02	MANIFOLD KIT
12	10-809876A1	SCREW KIT, Motor
13	809877A1	DRIVESHAFT/SEAL KIT
14	35-893912A02	FILTER KIT
15	893913A02	POPPET KIT
16	88238A18	CABLE ASSEMBLY
17	17-821539	PIN, Trilobe
18	17-19607	PIN
19	17-822869001	PIN
20	84-826802A12	HARNESS ASSEMBLY
21	8M0207773	RELAY ASSEMBLY
22	828102	BRACKET
23	25-818967	GROMMET
24	23-8M0214955	BUSHING
25	NSS	NOT SOLD SEPARATE, Decal-Trim Relay
26	10-8248326	SCREW, (M6 x 25 MM)
27	13541	PLUG, Male
28	84-852539A1	HARNESS ASSEMBLY, Adaptor

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
0	37-804655A00	DECAL, EPA Label Information Comment: (2000)

▶Starter Motor (15 parts)

Ref	OEM Part #	Part Name
1	50-898265001	STARTER MOTOR ASSEMBLY
2	10-965661	THRU BOLT
3	906431	DRIVE KIT
4	685751	DRIVE ASSEMBLY
5	8236392	DRIVE CAP
6	8236382	ARMATURE
7	8119011	CAP, Commutator
8	898265016	BRUSH/SPRING KIT
9	898265014	HOLDER
10	F15158	SCREW
11	10-81893450	SCREW, (M8 x 50)
12	13-26992	LOCKWASHER, (.250) Stainless Steel
13	11-64015	NUT, (.250-20)
14	NSS	NOT SOLD SEPARATE, Decal-Warning-High Voltage
15	84-93388A13	CABLE ASSEMBLY

▶Steering Arm (30 parts)

Ref	OEM Part #	Part Name
1	11-896963	NUT, (M12)
2	893773002	STRAP
3	8M0224385	MOUNT
4	8M0156878	BUMPER
5	8M0156878	BUMPER Comment: Bigfoot
6	53-89531	RING, Retaining
7	8M0118183	ARM, Steering Comment: Gray
8	8M0184092	BRACKET Comment: Non Handle
9	14-8M0009820	TAB WASHER Comment: Non Handle
10	10-4000377	SCREW, (M10 x 30) Comment: Non Handle
11	10-898835001	BOLT, (M12 x 154)
12	12-4002321	WASHER, (12.80 mm x 24.0 mm x 2.4 mm) Stainless Steel Comment: Bigfoot
13	23-8279971	SPACER
14	8M0219909	SWIVEL TUBE Comment: Bigfoot
15	84-88238T01	CABLE ASSEMBLY
16	8M0207768	CABLE ASSEMBLY, Ground
17	10-823567105	SCREW, (M10 x 105) Hex Flange - Stainless Steel
18	12-45176	WASHER, (.453 x .812 x .105) Stainless Steel Comment: Bigfoot
19	893703	BRACKET
20	10-878607	SCREW, (#10-16 x .380)
21	11-40140	NUT, (M10)
22	11-8M0204726	NUT, (.375-24) Comment: Handle
23	823792	LEVER Comment: Handle
24	12-29330	WASHER Comment: Handle
25	821961	ROD, Threaded Comment: Handle
26	821957	BRAKE PLATE Comment: Handle
27	8165621	DISC Comment: Handle
28	8M0007471	PLATE Comment: Handle
29	8165621	DISC Comment: Handle
30	10-768042	SHOULDER SCREW, Hex Comment: Handle

▶Swivel Bracket (17 parts)

Ref	OEM Part #	Part Name
1	19608A14	LINK ROD Comment: Non Handle
2	10-823919	SCREW, (.375-24 x 1.500) Comment: Non Handle
3	12-8M0109680	WASHER, (.390 x .546 x .12) Comment: Non Handle
4	12-37828	WASHER, (.390 x .625 x .062) Stainless Steel Comment: Non Handle
5	11-8M0204726	NUT, (.375-24) Comment: Non Handle
6	822397	PUCK Comment: Non Handle
7	23-8217711	BUSHING
8	1401-850066T01	SWIVEL BRACKET ASSEMBLY Comment: Gray
9	23-19606	BEARING
10	22-8M0169589	FITTING, Grease
11	37-8237011	DECAL, Co-Pilot
12	NSS	NOT SOLD SEPARATE, Decal-Serial Overlaminate
13	23-821777	BUSHING, Lower
14	26-8M0205512	SEAL
15	10-40011149	SCREW, (M8 x 25) Stainless Steel Comment: Non Handle
16	8282451	SEAL Comment: Non Handle
17	23-823507	BUSHING Comment: Non Bigfoot

▶Tiller Handle (48 parts)

Ref	OEM Part #	Part Name
-	37-8M0032728	DECAL, Lanyard, Black
1	822148T06	COVER KIT
2	822150	PULLEY
3	NSS	NOT SOLD SEPARATE, Case
4	10-878608	SCREW, (#10-16 x .500)
5	4324210	CABLE ASSEMBLY, Throttle (30.50 Inches)
6	4324211	CABLE ASSEMBLY, Throttle (41.50 Inches)
7	85-960099	SLEEVE, (12.00 Inches)
8	10-82526225	SCREW, (M8 x 25 MM)
9	822407F2	COVER Comment: Gray
10	23-821477	BUSHING
11	828813T2	ARM, Steering Handle Comment: Gray
12	822441	RETAINER
13	10-40011107	SCREW, (M5 x 16) Stainless Steel
14	10-8M0204707	SCREW, (M6 x 25)
15	892995	LOCK, Throttle
16	24-96203	SPRING
17	821972T	KNOB, Throttle
18	824918	CLIP
19	87-823609A12	SWITCH ASSEMBLY, Start
20	889734	HOUSING
21	37-855262	DECAL
22	8M0138696	TILLER TUBE
23	37-8242004	DECAL
24	821465	HANDLE, Throttle
25	8M0221732	GRIP
26	87-8M0104614	SWITCH, Stop
27	10-82239312	SCREW, (M5 x 12)
28	12-8M0214930	WASHER
29	84-8M0088388	ALARM
30	823687	CLIP
31	54-816311T	TIE STRAP, (8.00 Inches)
32	NSS	NOT SOLD SEPARATE, Decal-Shift
33	87-11083A31	SWITCH, Stop
34	15920Q54	LANYARD ASSEMBLY
35	8M0032846	RETAINER, Brass
36	10-40011151	SCREW, (M8 x 35) Stainless Steel
37	830180A01	HANDLE
38	23-830181	BUSHING
39	8301821	SHIFT ROD
40	12-8M0214930	WASHER
41	821455A5	BRACKET, Tiller Comment: Gray
42	13-826792	WAVE WASHER
43	23-821477	BUSHING
44	12-827314	WASHER
45	32-828547633	CONDUIT, (.620 Inside Diameter x 3.00 Feet Bulk)
46	14-8M0009820	TAB WASHER
47	10-82484890	SCREW, (M10 x 90)

▶Tools, Special (1 parts)

Ref	OEM Part #	Part Name
0	91-63209	HEAT LAMP Comment: Trim/Tilt System

▶Top Cowl (15 parts)

Ref	OEM Part #	Part Name
1	4019-825239T4	TOP COWL ASSEMBLY Comment: Silver
2	826291F1	LATCH Comment: Silver
3	10-8231871	SCREW, (M4 x 14.5)
4	8,13-26995	LOCKWASHER, Stainless Steel
5	11-8237515	NUT, (M4)
6	8M0153618	SEAL
7	825243A03	SOUND BLANKET KIT
8	NSS	NOT SOLD SEPARATE, Sound Blanket-Top
9	893763	BRACKET ASSEMBLY, Latch Roller
10	10-8248324	SCREW, (M6 x 16)
11	8M0038412	BRACKET
12	10-8231871	SCREW, (M4 x 14.5)
13	8,13-26995	LOCKWASHER, Stainless Steel
14	11-8237515	NUT, (M4)
15	47341A11	ROPE AND HANDLE KIT, Manual Starting

▶Transom Bracket (42 parts)

Ref	OEM Part #	Part Name
1	3418-822866A2	BRACKET ASSEMBLY, Transom Comment: Port-Gray
2	22-8M0169588	FITTING, Grease
3	17-99604	PIN, Groove
4	3418-822865F3	BRACKET, Transom Comment: Starboard-Gray
5	19618A3	LEVER ASSEMBLY, Tilt Lock Comment: Gray
6	24-99622	SPRING
7	23-65830	NYLINER
8	24-812708	SPRING
9	812709T6	KNOB Comment: Gray
10	17-99615	PIN, Groove
11	12-19619	WASHER
12	18486F6	BRACKET, Anchor Comment: Gray
13	97-818298Q1	ANODE KIT
14	10-8M0204707	SCREW, (M6 x 25)
15	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
16	10-4000355	SCREW, (M8 x 35)
17	13-400257	LOCKWASHER, (M8)
18	11-401388	NUT, (M8)
19	17-8M0026068	PIN ASSEMBLY, Tilt Lock Comment: Non Power Trim
20	24-821461	SPRING Comment: Non Power Trim
21	8M0041938	TILT TUBE
22	11-858869	NUT, (7/8-14)
23	19624A1	SEAL KIT Comment: Non Handle
24	25-29619	O-RING, (.583 x .103) Comment: Non Handle
25	23-78861	SPACER Comment: Non Handle
26	54-22740	CLIP Comment: Power Trim
27	8M0084613	C WASHER Comment: Power Trim
28	10-878609	SCREW, (#10-16 x .600) Comment: Power Trim
29	10-814259	SCREW, (.500-20 x 4.00)
30	12-8M0204648	WASHER, (1.5 x 3.05 x 0.13) Stainless Steel
31	11-91962	NUT, (.500-20)
32	8M0084737	LINK Comment: Non Power Trim
33	19615A05	LEVER ASSEMBLY, Tilt Comment: Non Power Trim
34	23-812707	BUSHING Comment: Non Power Trim
35	12-8M0042643	WASHER, (.520 x .850 x .060) Nylon - Black Comment: Non Power Trim
36	13-99611	WAVE WASHER Comment: Non Power Trim
37	8M0007469	TILT KNOB Comment: Non Power Trim
38	10-19611	SCREW, (.375-16 x .62) Comment: Non Power Trim
39	10-4009040	SCREW, (M10 x 40) Stainless Steel
40	12-4002319	WASHER
41	11-40140	NUT, (M10)
42	37-830253	DECAL, Tilt Lock

▶Trim Switch Kit (8 parts)

Ref	OEM Part #	Part Name
-	87-18286A18	SWITCH KIT, Trim (10.00 Feet)
1	18861	RETAINER
2	814820	ADAPTOR
3	NSS	NOT SOLD SEPARATE, Switch
4	88-8M0207796	FUSE, 20 Ampere
5	84-95084A2	CABLE ASSEMBLY
6	84-11149A2	CABLE ASSEMBLY, (6.00 Inches)
7	10-813523	SCREW, (#10-16 x 2.25)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 50 BIGFOOT (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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