Mercury 20 (2 CYL.) (0A730007 & Up) Parts & Diagrams

🔎 Mercury 20 (2 CYL.) Reference Library — Exploded parts diagrams (21 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 20 (2 CYL.) is a 4-Stroke, Inline 2-Cylinder, EFI outboard motor. A popular choice for small fishing boats, inflatable RIBs, and sailboat auxiliaries.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, Inline 2-Cylinder, EFI
Horsepower	20 HP
Displacement	333 cc
Bore x Stroke	61 mm x 57 mm
Spark Plug (Type & Gap)	NGK DCPR6E
Engine Oil Capacity	1.1 L (1.1 quart)
Recommended Engine Oil	SAE 25W-40 Synthetic Blend Mercury FC-W
Gear Case Oil Capacity	237 mL (8 fl oz)
Idle Speed (in gear)	750 ± 50 RPM (in gear)
Full Throttle RPM Range	5400-6200
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 20 (2 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 20 (2 CYL.).

▶Carburetor(20) (40 parts)

Ref	OEM Part #	Part Name
-	879732T89	POWERHEAD ASSEMBLY
1	1390-8888T18	CARBURETOR (ELECTRIC) - WMC-37
2	1395-9640	VALVE, Throttle
3	1395-9695	SHAFT, Throttle
4	1395-9164	BOWL, Fuel
5	1395-91691	FLOAT
6	1395-803861	VALVE, INLET NEEDLE
7	1395-7394	JET, (.044), MAIN FUEL (WMC 36/37)
8	1395-9171	PLUG, JET RETAINER
9	813618	COVER, DIAPHRAGM (WMC 29/30)
10	1395-9697	SCREW, DIAPHRAGM COVER
11	15827A1	BODY, FUEL PUMP
12	1395-9643	SCREW, FUEL PUMP COVER
13	1395-9637	COVER, FUEL PUMP
14	1395-9762	PLUG
15	1395-97611	GASKET/DIAPHRAGM KIT
16	1395-8237072	REPAIR KIT (WMC 36/37)
17	1395-9699	PLATE, COVER (MANUAL)
18	1395-823433	CHOKE, Electric (ELECTRIC)
19	1395-9696	SCREW, COVER PLATE
20	27-192061	GASKET, CARBURETOR
21	1395-9635	DIAPHRAGM/GASKET
22	1395-9633	GASKET
23	F10064	SHAFT
24	1395-824401	LEVER, Float
25	10-12110	SCREW, (#6-32 x .750), FAST IDLE LEVER
26	24-11277	SPRING, Tension
27	10-400018	SCREW, (M5 x 12), PRIMER BRACKET (M5 X 8 X 12 MM)
28	10-79965	SCREW, (#8-32 x .500) Stainless Steel, PRIMER BRACKET
29	112731	LEVER, Primer
30	11280	CAM BLOCK
31	53-11278	CLIP, Retaining
32	172291	BEZEL, Choke
33	128022	KNOB, PRIMER
34	17442	COVER, CARBURETOR
35	19-47579	PLUG, CARBURETOR COVER
36	127332	IDLE WIRE
37	128053	LEVER, Fast Idle, FAST IDLE
38	12803	BRACKET, Primer, PRIMER
39	11-821979	PUSH NUT, FAST IDLE LEVER

▶Carburetor(25) (40 parts)

Ref	OEM Part #	Part Name
-	879732T89	POWERHEAD ASSEMBLY
1	1390-8889T22	CARBURETOR (WMC-32)
2	1395-9646	VALVE, Throttle
3	1395-9695	SHAFT, Throttle
4	1395-9164	BOWL, Fuel
5	1395-91691	FLOAT
6	1395-803861	VALVE, INLET NEEDLE
7	1395-6201	JET, (.080), MAIN FUEL
8	1395-9171	PLUG, JET RETAINER
9	1395-823648	COVER, Diaphragm, DIAPHRAGM (WMC 31 A/32A)
10	1395-9697	SCREW, DIAPHRAGM COVER
11	15827A1	BODY, FUEL PUMP
12	1395-9643	SCREW, FUEL PUMP COVER
13	1395-9637	COVER, FUEL PUMP
14	1395-9762	PLUG
15	1395-97611	GASKET/DIAPHRAGM KIT
16	1395-8237072	REPAIR KIT (WMC 31A/32A)
17	1395-9699	PLATE, COVER (MANUAL)
18	1395-823433	CHOKE, Electric (ELECTRIC)
19	1395-9696	SCREW, COVER PLATE
20	27-192061	GASKET, CARBURETOR
21	1395-9635	DIAPHRAGM/GASKET
22	1395-9633	GASKET
23	F10064	SHAFT
24	1395-824401	LEVER, Float
25	10-12110	SCREW, (#6-32 x .750), FAST IDLE LEVER
26	24-11277	SPRING, Tension
27	10-400018	SCREW, (M5 x 12), PRIMER BRACKET
28	10-79965	SCREW, (#8-32 x .500) Stainless Steel, PRIMER BRACKET
29	112731	LEVER, Primer, PRIMER
30	11280	CAM BLOCK
31	53-11278	CLIP, Retaining
32	172291	BEZEL, Choke
33	128022	KNOB, PRIMER
34	17442	COVER
35	19-47579	PLUG
36	127332	IDLE WIRE
37	128053	LEVER, Fast Idle
38	12803	BRACKET, Primer
39	11-821979	PUSH NUT, FAST IDLE LEVER

▶Carburetor(SeaPro/Marathon 25/ Super15) (34 parts)

Ref	OEM Part #	Part Name
-	879732T89	POWERHEAD ASSEMBLY
1	1390-817405T6	CARBURETOR (WMC-43)
2	1395-9646	VALVE, Throttle
3	1395-9695	SHAFT, Throttle
4	1395-811353	BOWL, Fuel
5	1395-91691	FLOAT
6	1395-803861	VALVE, INLET NEEDLE
7	1395-6201	JET, (.080), MAIN FUEL
8	1395-9171	PLUG, JET RETAINER
9	1395-8113541	SHAFT, Choke (WMC-35B/43)
10	1395-811805	LEVER, Choke (WMC-35A/35B/43)
11	15827A1	BODY, FUEL PUMP
12	1395-9643	SCREW, FUEL PUMP COVER
13	1395-9637	COVER, FUEL PUMP
14	1395-811806	VALVE, Choke (WMC-35A/35B/43)
15	1395-97611	GASKET SET, Carburetor
16	1395-8237072	REPAIR KIT (WMC-43)
17	1395-9699	PLATE, COVER
18	1395-811360	SCREW, Bowl Drain
19	1395-9696	SCREW, COVER PLATE
20	27-192061	GASKET, CARBURETOR
21	1395-9635	DIAPHRAGM/GASKET
22	1395-9633	GASKET
23	F10064	SHAFT
24	1395-824401	LEVER, Float
25	41750T	INSERT
26	817424	KNOB, Choke
27	817426	INSERT, Choke Bezel
28	817425	LINK, Choke
29	172291	BEZEL, Choke
30	53-11278	CLIP, Retaining
31	17442	COVER, CARBURETOR
32	19-47579	PLUG, CARBURETOR COVE
33	10-40056110	SCREW, (M5 x 30)

▶Clamp Bracket Assembly (30 parts)

Ref	OEM Part #	Part Name
1	1497-8794A11	BRACKET ASSEMBLY, Transom (PORT) (TRACKER)
1/2A	1497-8794A6	BRACKET ASSEMBLY, Transom (PORT/STBD.) (GRAY) Comment: 6 HOLE
2	1497-8796A9	BRACKET ASSEMBLY, Transom (STBD.) (TRACKER)
3	10-92767A3	THUMB SCREW ASSEMBLY, (16 mm)
4	12-73719	WASHER, THUMB SCREW
5	10-768042	SCREW, WASHER ATTACHING
6	41042	HANDLE, CARRYING
7	17-56373A2	PIN ASSEMBLY, Tilt Comment: USE WITH 5 HOLE BRACKET
8	24-92995	SPRING Comment: USE WITH 5 HOLE BRACKET
9	23-818538	SPACER Comment: SCREW ATTACHING
10	11-400213	NUT, (M8) Stainless Steel Comment: STUD ATTACHING
11	16-99928	STUD Comment: STUD ATTACHING
12	10-4000333	SCREW, (M6 x 40) Comment: SCREW ATTACHING
13	11-93164	NUT, (.875), TILT TUBE
14	10-814945	SCREW, (.312-18 x 3.500) Stainless Steel, CLAMP BRACKET TO TRANSOM
15	12-67981	WASHER, CLAMP BRACKET BOLT
16	11-815848	NUT, (.312), CLAMP BRACKET BOLT
17	96965	LEVER, TILT STOP - STARBOARD STAR
18	10-41523	SCREW, (.250-28 x 1.00), LEVER TO SWIVEL BRACKET
19	11-826709109	NUT, (.250-28), TILT STOP LEVER SCREW
20	10-41524	SCREW, (.250-28 x 1.75), LEVER TO CLAMP BRACKET
21	24-44581	SPRING, TILT STOP LEVER SCREW
22	90901	STRAP, TILT STOP - PORT SIDE
23	10-41523	SCREW, (.250-28 x 1.00), STRAP TO SWIVEL BRACKET
24	11-826709109	NUT, (.250-28), TILT STOP STRAP SCREW
25	10-41524	SCREW, (.250-28 x 1.75), STRAP TO CLAMP BRACKET
26	13-31030	WAVE WASHER, TILT STOP STRAP SCREW
27	12-71421	WASHER, Nylon, TILT TUBE (NYLON)
28	8M0035075	TILT TUBE
29	54-8M0085928	CLIP, SAFETY

▶Cowls (37 parts)

Ref	OEM Part #	Part Name
1	2190-9163T19	TOP COWL ASSEMBLY Comment: (Black-Design I)
2	17773A2	SEAL, Cowl Comment: DESIGN II
3	17539	HANDLE, Cowl Comment: (Black-Design I)
4	10-95700	SCREW, (#10-16 x .500), COWL HANDLE Comment: (Black-Design I)
5	815625A02	SOUND BLANKET KIT Comment: (Black-Design I)
6	2190-9163T20	TOP COWL ASSEMBLY (TRACKER) Comment: DESIGN II
7	44311F4	SHIELD (TRACKER) Comment: DESIGN II
8	10-400018	SCREW, (M5 x 12), SHIELD Comment: DESIGN II
9	12-73288	WASHER, SHIELD SCREW Comment: DESIGN II
10	815625A02	SOUND BLANKET KIT Comment: DESIGN II
11	2193-9682A13	BOTTOM COWL (TRACKER)
12	25-17231	GROMMET, Shift Shaft
13	17220	LEVER, Cowl Latch
14	816202	HOOK, Latch
15	10-40019130	SCREW, (M6 x 30)
16	13-37642	WAVE WASHER
17	23-812707	BUSHING, NYLON
18	11-17224	NUT, Latch Retaining
19	17223	COVER, Harness
20	10-4000332	SCREW, (M6 x 35)
21	11-401196	NUT, (M6)
22	25-17226	GROMMET, Wire Harness
23	87-11083A6	SWITCH ASSEMBLY, Stop
24	8M0032846	RETAINER, Brass, STOP SWITCH
25	15920Q54	LANYARD ASSEMBLY
26	19-17230	PLUG, STOP SWITCH HOLE
27	17221	LATCH, Cowl
28	812413A1	BRACKET ASSEMBLY, Roller
29	10-400033	SCREW, (M5 x 12), LATCH AND HOOK
30	17234F6	COVER (HANDLE ) (GRAY)
31	17234F2	COVER (HANDLE ) (GRAY)
32	25-17227	GROMMET
33	10-4000334	SCREW, (M6 x 45) (ELECTRIC/MANUAL REMOTE CONTROL)
34	11-401196	NUT, (M6), COVER
35	25-17627	GROMMET
36	17233F1	COVER (TRACKER) Comment: (Electric/Manual Remote Control)
37	18517	SHIM, Cowl Latch Comment: (Electric/Manual Remote Control)

▶Crankshaft, Pistons and Flywheel (23 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	258-859232T15	FLYWHEEL (DESIGN II)
1A	258-859232T15	FLYWHEEL ASSEMBLY (DESIGN I)
2	10-97359A1	SCREW ASSEMBLY, FLYWHEEL TO CRANKSHAFT
3	12-86496	WASHER, FLYWHEEL SCREW
4	43-99301	RING GEAR, FLYWHEEL -ELECTRIC
5	10-88190313	SCREW, (M5 x 13), RING GEAR TO FLYWHEEL -ELECTRIC
6	464-8978T2	CRANKSHAFT ASSEMBLY
7	822445A1	WEAR SLEEVE
8	26-85107	SEAL, Oil, CRANKSHAFT - LOWER
9	31-85113T	BEARING, Roller, LOWER
10	31-85114T	BEARING, Roller - Upper, UPPER
11	26-859741	SEAL, Oil, CRANKSHAFT-UPPER
12	86992A5	BEARING ASSEMBLY, CENTER MAIN
13	28-20094	KEY, Woodruff, FLYWHEEL DRIVE
14	767-9104T19	PISTON ASSEMBLY Comment: (See Note)
15	40-828119	LOCK RING, PISTON PIN Comment: (See Note)
16	39-827491A12	RING SET, Piston Comment: (See Note)
17	630-8835A4	CONNECTING ROD ASSEMBLY
18	29-98295	BEARING, Needle, PISTON END
19	12-8M0012294	BEARING, LOCATING - NEEDLE BEARING
20	31-879877A1	BEARING ASSEMBLY, Roller
21	F1012	SCREW (STANDARD THREAD)

▶Cylinder Block and Covers (45 parts)

Ref	OEM Part #	Part Name
-	879732T89	POWERHEAD ASSEMBLY
1	NSS	NOT SOLD SEPARATE, Cylinder Block Comment: Order Complete Powerhead 822261A92) SN# 0D116956 THRU 0D117955
2	17-85171	PIN, Dowel
3	22-15133	FITTING (45 Degree)
4	32-99130100	HOSE (Cut to 12.25 Inches)
5	16-429173	STUD
6	10-40001209	SCREW, (M10 x 60)
7	27-892158	GASKET
8	92329F03	MANIFOLD, Exhaust
9	27-892157	GASKET
10	923301	COVER
11	10-4000333	SCREW, (M6 x 40)
12	144071	COVER
13	25-822370	O-RING
14	10-40011107	SCREW, (M5 x 16) Stainless Steel
15	1028-8282A1	COVER ASSEMBLY
16	10-4000331	SCREW, (M6 x 30)
17	27-863895	GASKET
18	22-996642	ELBOW
19	32-8M0108355	LINE, (57.00 Inches Bulk), TELL TALE (Cut to 8 Inches)
20	22-94848	FITTING
21	14406	COVER
22	25-86391	O-RING
23	10-40011107	SCREW, (M5 x 16) Stainless Steel
24	14408	COVER
25	25-822370	O-RING, (2.362 x .103)
26	10-40011107	SCREW, (M5 x 16) Stainless Steel
27	14112T	REED BLOCK (DESIGN II)
27A	14112T	REED BLOCK (DESIGN I)
28	85977002	SEAL (DESIGN I REED BLOCK)
29	27-414172	GASKET
30	34-816806	REED, Design I Reed Block
31	34-897931	STOP, Reed, Design I Reed Block
32	10-4005785	SCREW, (M4 x 10) (Design I Reed Block
33	27-414181	GASKET
34	41420A3	PLATE
35	22-56759	FITTING, Barbed
36	10-40019108	SCREW, (M5 x 20)
37	11-400213	NUT, (M8) Stainless Steel
38	143171	COVER
39	27-14318005	GASKET
40	10-4000333	SCREW, (M6 x 40)
41	14586	THERMOSTAT
42	54-12627	STRAP
43	27-8M0204714	GASKET

▶Driveshaft Housing Assembly (24 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	10-40011107	SCREW, (M5 x 16) Stainless Steel
2	96248A1	HOUSING ASSEMBLY, WATER TUBE
3	26-25329	SEAL, WATER TUBE
4	23-889715	SPACER, WATER TUBE
5	99702A7	ADAPTOR PLATE ASSEMBLY
6	27-41670006	GASKET, ADAPTOR PLATE
7	158662	SEAL, ADAPTOR PLATE
8	41211	BRACKET, UPPER MOUNT
9	10-40007128	SCREW, (M6 x 20) (Use With Reference #10)
10	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel (USE WHERE APPLICABLE)
11	32-86292	TUBE, Water (LONG SHAFT)
12	1588-9098T5	HOUSING ASSEMBLY, Driveshaft (LONG) (TRACKER)
13	27-433374	GASKET, DRIVE SHAFT HOUSING
14	14534	COVER, IDLE RELIEF
15	27-14621	GASKET, COVER
16	10-14742	SCREW, (.250-20 x 1.25), COVER
17	10-1993870	SCREW, DRIVE SHAFT HOUSING TO BLOCK (60 MM)
18	12-4002317	WASHER, DRIVE SHAFT HOUSING SCREW
19	27-19583	GASKET (USE WHERE APPLICABLE)
20	12-30164	WASHER, (.192 x .375 x .0312) Stainless Steel, HOUSING SCREW
21	17258F4	TRIM COVER (TRACKER)
22	10-8M0204741	SCREW, (M6 x 20) Stainless Steel, TRIM COVER
23	11-401196	NUT, (M6), TRIM COVER SCREW

▶Electric Start Components (22 parts)

Ref	OEM Part #	Part Name
1	8M0058226	RECTIFIER
2	10-48409	SCREW, (#10-16 x .625) Stainless Steel, RECTIFIER TO CYLINDER BLOCK
3	10-32,11-45076	NUT, Brass, RECTIFIER TERMINALS
4	89-8M0185149	SOLENOID ASSEMBLY, Starter
5	10-4000327	SCREW, (M6 x 14), STARTER SOLENOID TO CRANKCASE
6	8-32,11-26419	NUT, Brass, STARTER SOLENOID TERMINAL
7	11-64015	NUT, (.250-20), STARTER SOLENOID TERMINAL
8	84-88809A5	WIRE ASSEMBLY (YELLOW)
9	84-88439A28	CABLE ASSEMBLY, Battery (BLACK)
10	84-92436A5	HARNESS ASSEMBLY, ENGINE
11	88-8M0207796	FUSE, 20 Ampere
12	92753	RETAINER
13	54-8M0024808	J CLIP
14	50-8M0033984	STARTER MOTOR ASSEMBLY
15	96561	DRIVE KIT
16	96562	DRIVE
17	96563T	END CAP
18	96565	ARMATURE
19	96564T	END CAP
20	10-96566	THRU BOLT
21	10-421251	SCREW, (M8 x 55), STARTER MOTOR ATTACHING
22	134731	HOLDER, Fuse (OLD DESIGN)

▶Fuel Filter Assembly (10 parts)

Ref	OEM Part #	Part Name
1	35-889527A07	FILTER ASSEMBLY, Fuel (Design I)
2	35-87946Q04	FILTER ASSEMBLY (Design I)
3	25-897536	SEAL (Design I)
4	858731	BALL (Design I)
5	32-8M0108355	LINE, (57.00 Inches Bulk)
6	54-816311T	TIE STRAP, (8.00 Inches)
7	22-15781A9	CONNECTOR KIT, Fuel
8	10-8M0204707	SCREW, (M6 x 25), FUEL CONNECTOR
9	25-18202	GROMMET, FUEL CONNECTOR
10	35-816296Q2	FILTER, Fuel (DESIGN II)

▶Gear Housing(Driveshaft) (38 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	1665-8669A39	GEAR HOUSING ASSEMBLY (TRACKER)
2	35-41133	SCREEN, Water Inlet Port
3	10-40031112	SCREW, (M5 x 40)
4	11-400263	NUT, (M5), SCREEN SCREW
5	31-41326	BEARING, Roller, UPPER
6	26-99325	SEAL, GEAR HOUSING
7	17-8M0084726	PIN, Dowel (.187 x .530), GEAR HOUSING
8	31-98294A1	BEARING ASSEMBLY, Roller
9	43-98302	GEAR, Pinion
10	10-49908	SCREW, (.250-28 x .750), PINION GEAR
11	45-99198	DRIVESHAFT (LONG SHAFT)
13	22-8M0058389	SCREW, DRAIN - MAGNETIC
14	10-79953Q04	SCREW KIT, GREASE FILLER
15	25-8M0204684	O-RING, Rubber, DRAIN AND FILLER SCREW
16	85562A2	SHIFT CAM (STAMPED 85662--1)
17	17-85096	PIN, Drive
18	17-85593	PIN, (.078 x .437)
19	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel
20	24-93007	SPRING
21	12-85091	WASHER
22	25-85594	O-RING, (.239 x .174)
23	25-35276	O-RING, (.734 x .139)
24	93878	RETAINER
25	85552001	BOOT, SHIFT SHAFT
26	86293	SHIFT SHAFT (LONG SHAFT)
27	27-993261	GASKET, WATER PUMP
28	85083	FACE PLATE
29	12-8M0204722	WASHER, IMPELLER
30	28-8M0214993	KEY, IMPELLER DRIVE
31	47-8M0204712	IMPELLER
32	25-69202	O-RING, WATER PUMP
33	46-99157A02	PUMP ASSEMBLY, Water
34	10-8M0214928	SCREW, (M6 x 16), Use without Reference #36
35	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel, Use without Reference #36
36	23-8M0214959	BUSHING, Use with Reference #36
37	26-85090001	SEAL, WATER TUBE
38	25-86203	O-RING, DRIVE SHAFT - RUBBER

▶Gear Housing, Propeller Shaft (28 parts)

Ref	OEM Part #	Part Name
-	26-85090A2	SEAL KIT
1	1665-8669A39	GEAR HOUSING ASSEMBLY (TRACKER)
39	97-98432Q6	TRIM TAB
40	10-4000354	SCREW, (M8 x 30), TRIM TAB
41	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel
42	31-8M0103470	BEARING ASSEMBLY, Roller
43	43-44213T1	GEAR ASSEMBLY, Forward
44	23-85557	BUSHING
45	85094	FOLLOWER, Cam
46	24-38114	SPRING
47	52-41040T1	CLUTCH (STAMPED 52-41040--1)
48	44-8166231	PROPELLER SHAFT
49	24-88680	SPRING
50	17-8M0020999	PIN
51	43-99542T	GEAR, Reverse
52	99906T1	CARRIER ASSEMBLY, Bearing
53	31-21739	BEARING, Roller
54	26-41132	SEAL, Oil (INNER)
55	26-41131	SEAL, Oil (OUTER)
56	25-85549	O-RING
57	87293	PLATE
58	10-90883	SCREW, (M5 x 16)
59	851281	THRUST HUB ASSEMBLY
60	48-19638A40	PROPELLER (SEA PRO/MARATHON 25/SUPER 15)
61	11-4013812	NUT (SEA PRO/MARATHON 25/SUPER 15)
62	10-87810178	SCREW, (M10 x 35) Stainless Steel
63	12-43328	WASHER
64	23-41589	SPACER (USE WHERE APPLICABLE)

▶Harness and Start Components(Electric Handle) (13 parts)

Ref	OEM Part #	Part Name
1	95815	COVER, START SWITCH (TOP)
2	95828	COVER, START SWITCH (BOTTOM)
3	87-95810A1	SWITCH ASSEMBLY, Start
4	55741001	BOOT
5	87-88890A2	SWITCH ASSEMBLY
6	95814	STRAP, CLAMP
7	95813	FASTENER, CLAMP STRAP
8	10-40019108	SCREW, (M5 x 20)
9	10-4005727	SCREW
10	12-45771	WASHER
11	10-62568	SCREW, (#10-16 x .375), SWITCH WIRE
12	10-69570	SCREW, (#10-16 x .750), COVER
13	84-79139A20	CABLE ASSEMBLY (RED)

▶Ignition/Electrical Components (27 parts)

Ref	OEM Part #	Part Name
1	86617A20	STATOR ASSEMBLY
2	10-400015	SCREW, (M5 x 10), STATOR ATTACHING
3	98450A10	TRIGGER ASSEMBLY
4	54-22740	CLIP, TRIGGER LEADS Comment: (Electric/Manual Alternator)
5	10-48408	SCREW, (#10-16 x .500), CLIP TO CRANKCASE
6	8M0084613	C WASHER, CLIP SCREW
7	339-832757A4	COIL ASSEMBLY, Ignition
8	997621	COVER, IGNITION COIL
9	10-1994155	SCREW, (M5 x 55) Stainless Steel, IGNITION COIL COVER
10	10-32,11-45076	NUT, Brass, COIL TERMINAL
11	84-813715A2	CABLE SET, High Tension (5 and 8.25 Inch) (COMMERCIAL ENGINES)
12	85-63709A1	BOOT/TERMINAL KIT, SPARK PLUG
13	33-938	SPARK PLUG (NGK #BPZ8H-N-10) Comment: (See Service Bulletin 91-36)
14	339-7452A19	SWITCHBOX ASSEMBLY
15	10-40019108	SCREW, (M5 x 20), SWITCH BOX TO CYLINDER BLOCK
17	84-88807A10	CABLE ASSEMBLY, AUXILIARY
18	10-48408	SCREW, (#10-16 x .500), GROUND WIRE
19	86704A10	STATOR ASSEMBLY, AUXILIARY
20	10-4000123	SCREW, (M5 x 30), STATOR ATTACHING
21	86-638131	TERMINAL BLOCK
22	10-48409	SCREW, (#10-16 x .625) Stainless Steel, TERMINAL BLOCK
23	95845T	REGULATOR, Voltage
24	10-92799	SCREW, (#10-16 x 1.12)
25	10-32,11-45076	NUT, Brass
26	84-74725A2	HARNESS ASSEMBLY (BLACK/RED)
27	71663	PLUG
28	84-65017A2	HARNESS ASSEMBLY (EXTERNAL)

▶Recoil Starter Assembly(MANUAL) (28 parts)

Ref	OEM Part #	Part Name
1	86689A5	HOUSING ASSEMBLY, Starter, STARTER
2	86971	COVER, STARTER HOUSING (EARLY MODELS)
3	858925	LEVER, LOCK (UPPER)
4	24-12734	SPRING, UPPER LOCK LEVER
5	93876T02	LEVER, LOCK (LOWER)
6	10-92051	SCREW, (10-16 x .75) Comment: (SeaPro/Marathon 25/Super 15)
7	23-818142	BUSHING Comment: (SeaPro/Marathon 25/Super 15)
8	12-89302	WASHER, (.203 x .406 x .040) Comment: (SeaPro/Marathon 25/Super 15)
9	833161T	PAD, FELT
10	24-86857T01	SPRING, STARTER
11	50-825269T01	SHEAVE, STARTER
12	24-86851T02	SPRING, CAM
13	868501	CAM
14	53-86849T01	RING, Retaining, CAM
15	50-12066Q10	ROPE, STARTER
16	85174A1	HANDLE ASSEMBLY, STARTER ROPE
17	24-868523	SPRING, CAM
18	86853T01	CAM
19	10-826253	SCREW, CAM TO STARTER SHEAVE
20	426264	SUPPORT, STARTER HANDLE
21	10-40019111	SCREW, (M5 x 35), SUPPORT TO STARTER HOUSING
23	23-309772	SPACER, SUPPORT SCREW
24	11-401385	NUT, (M5), SUPPORT SCREW
25	44180	BUSHING, Rope
26	856154T01	SUPPORT
27	12-23538	WASHER
28	17-38489	PIN, Roll, LOCK LEVER
29	10-40011131	SCREW, (M6 x 35) Stainless Steel, STARTER HOUSING ATTACHING

▶Service/Support Material (1 parts)

Ref	OEM Part #	Part Name
-	37-824731A94	DECAL SET (TRACKER 25)

▶Steering Handle Assembly(Manual/Electric Handle) (19 parts)

Ref	OEM Part #	Part Name
1	8M0221732	GRIP
2	NLA	No Longer Available, Stop Switch Comment: (Design I - Order Kit 87-823609A10 - Reference 3)
3	87-823609A10	SWITCH KIT, Stop - Throttle Handle
4	87-8M0104615	SWITCH ASSEMBLY, Stop (DESIGN II -W/METAL LOCK RING)
5	37-140124	DECAL (INTERNATIONAL SYMBOLS)
6	10-37342	SCREW, (#12-14 x .375)
7	99333A2	TUBE ASSEMBLY
8	975501	TUBE ASSEMBLY
9	43447A5	BRACKET ASSEMBLY, Steering (Tracker) Comment: (Reference 13 is 1.125 Inch -12)
10	44397A22	BRACKET ASSEMBLY (TRACKER) Comment: (Reference 13 is 1.125 Inch -12)
11	10-40011110	SCREW, (M5 x 30) Stainless Steel Comment: (Reference 13 is 1.125 Inch -12)
12	12-177821	WASHER Comment: (Reference 13 is 1.125 Inch -12)
13	11-816880	NUT Comment: (Reference 13 is 1.125 Inch -12)
14	22-8M0169589	FITTING, Grease Comment: (Reference 13 is 1.125 Inch -12)
15	23-817026	BUSHING Comment: (Reference 13 is 1.125 Inch -12)
16	432422	CABLE ASSEMBLY, Throttle (SIDE SHIFT)
17	11-400212	NUT, (M6) Stainless Steel
18	10-4000384	SCREW, (M10 x 80)
19	817634	PLUG (SEA PRO/MARATHON 25/SUPER 15)

▶Swivel Bracket Assembly (35 parts)

Ref	OEM Part #	Part Name
-	27-41499A88	GASKET SET
1	822238A9	SWIVEL HEAD (TRACKER) Comment: DESIGN II - CO-PILOT
2	3415-822237A4	SWIVEL BRACKET (TRACKER) Comment: DESIGN II - CO-PILOT
3	22-8M0169589	FITTING, Grease Comment: DESIGN II - CO-PILOT
4	23-85154A1	BUSHING KIT Comment: DESIGN II - CO-PILOT
5	25-86993	O-RING Comment: DESIGN II - CO-PILOT
6	821961	ROD Comment: DESIGN II - CO-PILOT
7	8165621	DISC Comment: DESIGN II - CO-PILOT
8	821958A1	PLATE, Swivel Head Comment: DESIGN II - CO-PILOT
9	10-768042	SCREW Comment: DESIGN II - CO-PILOT
10	821957	BRAKE PLATE Comment: DESIGN II - CO-PILOT
11	12-29330	WASHER Comment: DESIGN II - CO-PILOT
12	821959	HANDLE Comment: DESIGN II - CO-PILOT
13	11-8M0204726	NUT, (.375-24) Comment: DESIGN II - CO-PILOT
14	10-125161	SCREW, (M8 x 133.35), UPPER MOUNT
15	14894	MOUNT, UPPER
16	12-85172	WASHER, RUBBER - UPPER MOUNT SCREW
17	12-43430	WASHER, UPPER MOUNT SCREW
18	11-400213	NUT, (M8) Stainless Steel, UPPER MOUNT SCREW
19	16554	ROD, REVERSE HOOK
20	98830A2	HOOK ASSEMBLY, REVERSE LOCK
21	24-96018	SPRING, REVERSE HOOK - PORT
22	24-879894	SPRING (STBD - MANUAL/ELECTRIC HANDLE)
23	85122001	MOUNT, LOWER
24	85123001	BUMPER, Front
25	17232A3	COVER, LOWER MOUNT (TRACKER)
26	10-1994360	SCREW (60 MM)
27	10-19943100	SCREW (100 MM)
28	11-400213	NUT, (M8) Stainless Steel
29	12-36001	WASHER
30	12756	BRACKET
31	12758	LEVER, CONTROL
32	24-12754	SPRING
33	17-13195	PIN
34	53-13194	RING, Retaining

▶Throttle and Shift Linkage(Electric/Manual Remote Control) (45 parts)

Ref	OEM Part #	Part Name
1	17764A2	LINK KIT, Throttle
2	23-8M0215006	BUSHING
3	13-34632	WASHER
4	48039	CAP, IDLE STOP SCREW
5	92425	DASHPOT (Use where Applicable)
6	93001	BRACKET (Use where Applicable)
7	11-28770	NUT, (.312-24) Stainless Steel (Use where Applicable)
8	23-60762	BUSHING, SHIFT SHAFT
9	17724A1	LEVER, SHIFT SHAFT
10	11-401385	NUT, (M5), SHIFT SHAFT
11	433601	LEVER, CONTROL
12	817429	TIMING LINK
13	817428	SOCKET
13A	10-32,11-45076	NUT, Brass
14	42026A2	PLATFORM, CONTROL
15	10-16955	SCREW, (M6 x 8), PLATFORM
16	12-8M0214930	WASHER, PLATFORM SCREW
17	13-69708	WAVE WASHER
18	24-89540	SPRING, SPARK ADVANCE
19	42343	LEVER, ACTUATING
20	56-8M0206596	SCREW, (M6 x 20), CONTROL PLATFORM
21	10-40007128	SCREW, (M6 x 20), SHIFT LEVER TO PLATFORM
22	12-95093	WASHER, SHIFT LEVER TO PLATFORM
23	43424	LEVER, SHIFT
24	23-95091	SLEEVE, SHIFT LEVER TO PLATFORM
25	12-35280	WASHER, (.255 x .620 x .030) Stainless Steel, SHIFT LEVER SCREW
26	11-401196	NUT, (M6), SHIFT LEVER SCREW
27	42846A2	COVER ASSEMBLY
28	39519	CUP, RETAINER
29	10-118591	SCREW, (.190-32 x 1.750), IDLE STOP - CONTROL LEVER
30	434442	SHIFT LINK
31	95027A6	SHIFT SHAFT, HORIZONTAL
32	42156	LEVER, SHIFT SHAFT
33	53-95019	RING, Retaining (OLD DESIGN)
34	12-89302	WASHER, (.203 x .406 x .040), SHIFT LINK
35	18-210711	COTTER PIN, SHIFT LINK
36	424291	RETAINER, CABLE
37	41323A03	LINK ROD ASSEMBLY, STEERING
38	10-849838	SCREW, (.375-24 x 1.25), LINK ROD
39	12-34931	WASHER, (.406 x .734 x .063) Stainless Steel, SCREW AND LINK ROD
40	11-8M0204726	NUT, (.375-24), SCREW AND LINK ROD
41	96186A2	BRACKET ASSEMBLY, ATTACHING
42	10-1993325	SCREW, (M10 x 25), BRACKET
43	96201	STRAP, Key (OLD DESIGN)
44	13-400248	LOCKWASHER, (M10) (NEW DESIGN)

▶Throttle and Shift Linkage(Side Shift) (38 parts)

Ref	OEM Part #	Part Name
1	17764A2	LINK KIT, Throttle
2	110383	LEVER, CONTROL
3	10-118591	SCREW, (.190-32 x 1.750), CONTROL LEVER
4	48039	CAP, CONTROL LEVER SCREW
5	24-89540	SPRING, SPARK ADVANCE
6	42343	LEVER, ACTUATING
7	817429	TIMING LINK
8	817428	SOCKET
9	10-32,11-45076	NUT, Brass
11	423301	HANDLE, SHIFT
12	23-60762	BUSHING, SHIFT HANDLE
13	423291	LEVER, SHIFT
14	42358	BACKPLATE, SHIFT LEVER
15	11-401385	NUT, (M5), SHIFT LEVER
16	24-39627	SPRING, DETENT
17	39601	PLATE, DETENT SPRING (OLD DESIGN)
18	10-400018	SCREW, (M5 x 12), DETENT SPRING AND PLATE
19	23-96202	BUSHING, SHIFT LINK
20	12-89302	WASHER, (.203 x .406 x .040), SHIFT LINK
21	18-210711	COTTER PIN, SHIFT LINK
22	11042	LINK, SHIFT
23	110501	LEVER, THROTTLE LIMIT
24	10-400036	SCREW, (M5 x 20), THROTTLE LIMIT LEVER
25	23-8M0214959	BUSHING, THROTTLE LIMIT LEVER
26	12-89302	WASHER, (.203 x .406 x .040), THROTTLE LIMIT SCREW
27	11-401385	NUT, (M5), THROTTLE LIMIT SCREW
28	17848	BRACKET
29	10-8M0204707	SCREW, (M6 x 25), CABLE BRACKET
30	42026A2	PLATFORM, CONTROL
31	10-16955	SCREW, (M6 x 8)
32	12-8M0214930	WASHER
33	13-69708	WAVE WASHER
34	10-8M0214928	SCREW, (M6 x 16), PLATFORM TO BLOCK
35	92425	DASHPOT (OLD DESIGN)
36	93001	BRACKET, DASHPOT (OLD DESIGN)
37	11-28770	NUT, (.312-24) Stainless Steel, DASHPOT TERMINAL (OLD DESIGN)
38	821211	SPACER (SUPER 15)
39	10-821210	SCREW (SUPER 15)

▶Throttle and Shift Linkage(Tiller Handle Shift) (34 parts)

Ref	OEM Part #	Part Name
1	17725A1	SHIFT LINK
1A	817428	SOCKET
2	95027A6	SHIFT SHAFT, HORIZONTAL
3	23-60762	BUSHING
4	17724A1	LEVER
5	11-401385	NUT, (M5)
6	23-8M0215006	BUSHING
7	13-34632	WASHER
8	42156	LEVER
9	53-95019	RING, Retaining (OLD DESIGN)
10	17764A2	LINK KIT, Throttle
11	433601	LEVER
12	817429	TIMING LINK
13	817428	SOCKET
13A	10-32,11-45076	NUT, Brass
14	10-8M0214928	SCREW, (M6 x 16)
15	12863A1	PLATFORM
16	10-16955	SCREW, (M6 x 8)
17	12-8M0214930	WASHER
18	13-69708	WAVE WASHER
19	24-89540	SPRING
20	92362A1	LEVER
21	937791	LEVER
22	867171	LINK
23	53-17680	RING, Retaining
24	13-29720	WAVE WASHER
25	94085A1	GEAR
26	24-8M0215005	SPRING
27	30-93008	BALL
29	10-118591	SCREW, (.190-32 x 1.750)
30	48039	CAP
31	92425	DASHPOT (Use where Applicable)
32	93001	BRACKET (Use where Applicable)
33	11-28770	NUT, (.312-24) Stainless Steel (Use where Applicable)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 20 (2 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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