Mercury 90 (3 CYL.) (0B240451 THRU 0C221999) Parts & Diagrams

🔎 Mercury 90 (3 CYL.) Reference Library — Exploded parts diagrams (27 diagrams), specifications, common issues, and maintenance checklist.

The Mercury 90 (3 CYL.) is a 4-Stroke, Inline 4-Cylinder, EFI, SOHC outboard motor. Suited for bay boats, pontoons, and center-console fishing boats requiring reliable mid-range power.

Quick Reference Specifications

Specification	Value
Engine Type	4-Stroke, Inline 4-Cylinder, EFI, SOHC
Horsepower	90 HP
Displacement	2100 cc
Bore x Stroke	90 mm x 81 mm
Spark Plug (Type & Gap)	NGK IZFR6F-11
Engine Oil Capacity	5.2 L (5.5 quart)
Recommended Engine Oil	Mercury FourStroke Oil 10W-30
Gear Case Oil Capacity	710 mL (24 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 90 (3 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 90 (3 CYL.).

▶Carburetor (27 parts)

Ref	OEM Part #	Part Name
-	1395-8236354	REPAIR KIT
1	3301-9012A66	CARBURETOR ASSEMBLY, Bottom, 90, WME-15
2	NSS	NOT SOLD SEPARATE, Gasket, Fuel Bowl
3	NSS	NOT SOLD SEPARATE, Retaining Ring
4	1395-811693	BOWL, Fuel, Center, Lower
5	1395-9591	SHAFT, Throttle, Upper, Lower
6	19270	SHAFT, Throttle, Center
7	1395-811216	VALVE, Throttle, 90, WME-15
8	1395-9594	FLOAT
9	NSS	NOT SOLD SEPARATE, Float Shaft
10	1395-879194011	VALVE, Inlet Needle
11	1395-811694	PLUG, Main Jet
12	NSS	NOT SOLD SEPARATE, Gasket, Plug
13	NSS	NOT SOLD SEPARATE, Gasket, Cover Plate
14	27-151724	GASKET, Flange
15	NSS	NOT SOLD SEPARATE, Screw, Throttle Valve
16	1395-9597	SCREW, Cover Plate
17	1395-808612	SCREW, Fuel Bowl
18	1395-9598	COVER PLATE
19	1399-4215	JET, Main Fuel (.066), Main Fuel, 90 - WME-15
20	1395-8423	JET, (.094), Vent, .094
21	NSS	NOT SOLD SEPARATE, Gasket, Nozzle Well
22	NSS	NOT SOLD SEPARATE, Spring, Idle Needle
23	NSS	NOT SOLD SEPARATE, Spring, Throttle Return
24	NSS	NOT SOLD SEPARATE, Spring, Idle Air
25	NSS	NOT SOLD SEPARATE, Idle Needle
26	NSS	NOT SOLD SEPARATE, Idle Air Needle

▶Carburetor And Attenuator Plate (24 parts)

Ref	OEM Part #	Part Name
1	3301-9012A64	CARBURETOR ASSEMBLY, Top, 90, WME-15
2	3301-9012A65	CARBURETOR ASSEMBLY, Center, 90, WME-15
3	3301-9012A66	CARBURETOR ASSEMBLY, Bottom, 90, WME-15
4	12-8M0204666	WASHER, (.203 x .500 x .032), Link Screw
5	27-151724	GASKET, Carburetor To Attenator Plate
6	32-9912878	TUBING, Carburetor To Carburetor
7	54-816311T	TIE STRAP
8	8M0084744	LINK ROD
9	11399A1	ARM ASSEMBLY
10	10-40057103	SCREW, (M5 x 6), Arm
11	12-8M0204666	WASHER, (.203 x .500 x .032), Arm Screw
12	67748	ROLLER
13	98886T01	LINK, Adjusting
14	98887T	LINK, Throttle
15	10-48409	SCREW, (#10-16 x .625) Stainless Steel, Link
16	42970A2	PLATE ASSEMBLY, Sound Attenuator
17	12-4002217	WASHER, Carburetor Studs
18	11-401388	NUT, Carburetor Studs
19	39519	CUP, Retainer
20	98889	LATCH, Control Cable
21	10-42975	DRIVE SCREW, Latch To Plate
22	27-430001	GASKET, Attenuator Cover
23	42969A3	COVER, Attenuator
24	10-48409	SCREW, (#10-16 x .625) Stainless Steel, Attenuator Cover

▶Co-Pilot (11 parts)

Ref	OEM Part #	Part Name
-	56-52148A7	CO-PILOT ASSEMBLY
1	52148	PILOT ROD
2	11-52155A1	NUT ASSEMBLY
3	10-36154	SCREW, (.250-28 x 1.380)
4	11-52152	WING NUT
5	873491	ROD
6	23-521512	BUSHING
7	12-20722	WASHER, (.328 x .625 x .060)
8	11-826709111	NUT, (.312-24)
9	12-20722	WASHER, (.328 x .625 x .060)
10	11-826709111	NUT, (.312-24)

▶Cowl Mounting Brackets (27 parts)

Ref	OEM Part #	Part Name
1	42965A2	BRACKET ASSEMBLY, Cowl Seal, Oyster
2	193861	SEAL, Bracket, Oyster
3	42935	SEAL
4	42908	RESTRAINT
5	10-400015	SCREW, (M5 x 10), Restraint
6	12-42118	WASHER, Restraint Screw
7	429071	CONNECTOR, Tell Tale, Oyster
8	32-8M0108349	TUBING, Tell Tale
9	54-816311T	TIE STRAP
10	932642	HOUSING, Hinge
11	10-8M0103817	SCREW, Housing
12	12-814803	WASHER, Housing Screw
13	12-8M0204690	WASHER, Housing Screw
14	25-88033	GROMMET, Housing Screw
15	23-14395	BUSHING, Housing Screw
16	10-4000123	SCREW, (M5 x 30), Housing To Bracket
17	12-42118	WASHER, Housing Screw
18	42952T6	BRACKET, Support, Front, Oyster
19	67260	SEAL, Control Cables
20	25-67272	GROMMET, Bracket
21	99447	RETAINER, Control Cables, Power Trim
22	10-40011109	SCREW, (M5 x 25), Retainer
23	10-82127335	SCREW, (M8 x 1.25 x 35) , Retainer
24	12-814803	WASHER, Bracket Screw
25	12-8M0204690	WASHER, Bracket Screw
26	25-88033	GROMMET, Bracket
27	23-14395	BUSHING, Bracket Screw

▶Cowls and Front Cover (36 parts)

Ref	OEM Part #	Part Name
1	2188-9006A3	TOP COWL ASSEMBLY, Port, Oyster
2	429404	SEAL, Upper Cowl
3	12401	SEAL, Cowl, Rear
4	90274	SEAL
5	429581	SHIELD OYSTER, Air Inlet, Oyster
6	10-48409	SCREW, (#10-16 x .625) Stainless Steel, Shield
7	12-4002313	WASHER, Shield Screw
8	435331	SOUND BLANKET
9	193681	SEAL, (3.20 Inch), Oyster
10	2187-9070A5	TOP COWL ASSEMBLY, Starboard, Oyster
11	11315A1	OIL LEVEL GAUGE ASSEMBLY
12	11-11316	SPEED NUT
12A	113171	RETAINER
13	10-48409	SCREW, (#10-16 x .625) Stainless Steel, Shield
14	12-4002313	WASHER, Shield Screw
15	435342	SOUND BLANKET, Black, Gray
16	193681	SEAL, (3.20 Inch), Oyster
17	42905	GROMMET, Handle Models
18	812431	PLUG, Handle Models
19	26-60297	SEAL
20	42957	SHIELD, Air Inlet
21	47341A11	ROPE AND HANDLE KIT, Manual/Emergency Start, Manual Starting
22	43138A3	COVER ASSEMBLY, Oyster
23	12356	BUMPER
24	24-17288	SPRING, Cover
25	43137A1	BRACKET ASSEMBLY
26	11-434181	SPEED NUT
27	15432	RETAINER, Bracket
28	17-43134	PIN, Bracket
29	10-48409	SCREW, (#10-16 x .625) Stainless Steel
30	12-8M0204690	WASHER
31	87985	BRACKET, Lower
32	879871	BRACKET, Upper
33	10-40011149	SCREW, Bracket
34	120811	LATCH, Cowl
35	37-179061	EMBLEM, Oyster

▶Crankshaft, Pistons/Connecting Rods (#638-8532--1) (22 parts)

Ref	OEM Part #	Part Name
-	27-43004A99	GASKET SET
1	472-9001T3	CRANKSHAFT ASSEMBLY
2	30-43011T	BEARING, Ball, Crankshaft, Lower
3	53-93412	RING, Retaining, Ball Bearing
4	25-35126	O-RING, (.859 x .139), New Design
4A	54196A6	CARRIER ASSEMBLY, Seal, Old Design
5	65800	PACKING, Carrier, Old Design
6	28-91800	KEY, Woodruff, Drive
7	43-43019A1	GEAR ASSEMBLY
8	39-42079A4	RING ASSEMBLY, Sealing
9	42943A1	BEARING ASSEMBLY, Roller
10	777-9009A7	PISTON ASSEMBLY (.030) Oversize
11	53-857196	RING, Lock, Piston
12	39-96170A4	RING SET, Piston (.030) Oversize
13	638-9002A6	CONNECTING ROD ASSEMBLY
14	12-8M0032839	WASHER, Needle Locating
15	29-8M0204715	NEEDLE, Roller Bearing, Piston End
16	10-94320	SCREW, Connecting Rod
17	31-844338A01	BEARING/CAGE KIT, Crankshaft End
18	31-43013T3	BEARING ASSEMBLY, Roller, Upper
19	26-8M0214932	SEAL, Oil
20	25-823683	O-RING

▶Crankshaft, Pistons/Connecting Rods (#646-818846) (19 parts)

Ref	OEM Part #	Part Name
1	472-9001T3	CRANKSHAFT ASSEMBLY
2	30-43011T	BEARING, Ball, Lower
3	786611	WEAR SLEEVE
4	25-35126	O-RING, (.859 x .139)
5	39-818412A4	RING ASSEMBLY
6	28-91800	KEY, Woodruff
7	43-43019A1	GEAR ASSEMBLY
8	31-43013T3	BEARING ASSEMBLY, Roller, Upper
9	26-8M0214932	SEAL, Oil
10	25-823683	O-RING, (1.989 x .070)
11	42943A1	BEARING ASSEMBLY, Roller
12	777-815965A6	PISTON ASSEMBLY (.030) Oversize
13	53-857196	RING, Lock
14	39-96170A4	RING SET, Piston (.030) Oversize
15	646-818846T6	CONNECTING ROD ASSEMBLY
16	12-8M0012298	WASHER
17	29-8M0214954	BEARING, Needle
18	10-94320	SCREW, (.375-24 x 1.250)
19	31-844338A01	BEARING ASSEMBLY, Roller

▶Cylinder Block and Crankcase (50 parts)

Ref	OEM Part #	Part Name
-	27-43004A99	GASKET SET
1	876-8947T51	CYLINDER BLOCK, 90 Comment: (Use With WME-15 Carburetor)
2	10-4009680	SCREW, (M10 x 80), Crankcase To Cylinder Block
3	17-8M0036405	PIN, Bearing Race
4	17-43044	PIN, Dowel, Locating
5	428841	COVER, Starter, Top
6	76867	COVER, Starter, Bottom
7	10-81742750	SCREW, Starter Cover
8	65848	CARRIER, Poppet Valve
9	25-64872	GROMMET, Poppet Valve
10	22-814204A1	BLEED SYSTEM KIT
10A	21-42657A3	CHECK VALVE, Crankcase
11	10-814776	SCREW, Adjusting
12	11-400212	NUT, Jam, Adjusting Screw
13	42942	CAP, Adjusting Screw
14	21-426233	CHECK VALVE, Press-In
15	16-821676A1	SCREW, Block, Screw Attachment
15A	16-821676A1	STUD, Block, Stud Attachment
16	12-8M0214963	WASHER, (.406 x .750 x .104), Block Stud, Stud Attachment
17	11-40140	NUT, (M10), Block Stud, Stud Attachment
18	1034-9003A2	COVER, Cylinder Block
19	27-430057	GASKET, Cylinder Block Cover
20	10-82127335	SCREW, (M8 x 1.25 x 35) , Cylinder Block Cover
21	54-47483	J CLIP, Cylinder Block Cover Screw
22	78799	SENDER, Temperature (19.50 Inch)
23	44290T	RETAINER, Temperature Sender
24	10-48409	SCREW, (#10-16 x .625) Stainless Steel, Retainer
25	12-8M0204666	WASHER, (.203 x .500 x .032), Retainer Screw
26	86596	POPPET VALVE
27	648771	DIAPHRAGM
28	12-94182	WASHER
29	10-69570	SCREW, (#10-16 x .750)
30	24-42996	SPRING, (Stainless Steel), Compression, Poppet Valve
31	75692	THERMOSTAT (143)
32	27-8M0204714	GASKET, Thermostat
33	27-430068	GASKET, Thermostat Cover
34	8M0047619	COVER, Thermostat
35	10-82127335	SCREW, (M8 x 1.25 x 35) , Thermostat Cover
36	12621	COVER, Oil Pad, Non Oil Injection
37	27-126201	GASKET, Cover, Non Oil Injection
38	10-40007106	SCREW, (M5 x 13), Cover, Non Oil Injection
39	12-4002314	WASHER, Cover Screw, Non Oil Injection
40	14857A16	MODULE, Oil Warning
41	10-4010630	SCREW, (M6 x 30) Stainless Steel, Oil Warning Module
42	22-328022	PLUG, Pipe (.125-27), Black, Gray
43	12415	SENDER, Temperature Comment: Oyster, Power Boat
44	84-88824A6	CABLE ASSEMBLY, Temperature Sender Comment: Oyster, Power Boat
45	32-892024122	TUBING, (20.00 Feet Bulk), Bleed
46	10-82127335	SCREW, (M8 x 1.25 x 35) , Crankcase To Cylinder Block
47	99162001	BOOT, Oil Tank

▶Driveshaft Housing (40 parts)

Ref	OEM Part #	Part Name
--	12092A4	SPACER KIT, Drive Shaft Housing X-Long (Gray)
1	1598-8974T23	HOUSING ASSEMBLY, Driveshaft, Oyster
2	16-903502	STUD, (M10 x 227), Drive Shaft Housing, X-Long
3	10-4000380	SCREW, (M10 x 45), Gear Housing, Long, Black, Gray
3A	16-9035012	STUD, Gear Housing, Oyster
4	16-903503	STUD, (M10 x 190), Gear Housing, X-Long
5	12-45176	WASHER, Gear Housing Stud, Screw Comment: (Quantity Of Three On Oyster)
6	11-40140	NUT, (M10), Gear Housing Stud Comment: (X-Long, Quantity Of Five)
7	429222	GUIDE, Push Rod, Non Power Trim
7A	19-158641	PLUG, Power Trim, Oyster
8	22-85822A4	PICKUP ASSEMBLY, Speedometer
9	22-433351	CONNECTOR, 90 Degree (.125-27) Nylon
10	22-85822T	CONNECTOR, Straight
11	14664A2	HOOK ASSEMBLY, Reverse, Non Power Trim
12	16686	PUSH ROD, Non Power Trim
13	99606	SHAFT, Reverse Lock, Non Power Trim
14	18-45882	COTTER PIN, Shaft, Non Power Trim
15	23-69132	BUSHING, Reverse Lock Shaft Comment: (Non Power Trim)
16	24-996261	SPRING, Reverse Lock, Non Power Trim
17	18-47959	COTTER PIN, Spring, Non Power Trim
18	12-8M0042642	WASHER, (.323 x .563 x .063) Stainless Steel, Push Rod, Non Power Trim
19	24-16733	SPRING (Push Rod Nut, Non Power Trim
20	996361	YOKE, Push Rod, Non Power Trim
21	11-82670911	NUT, (.312-24) Stainless Steel, Jam, Push Rod, Non Power Trim
22	17-99663	PIN, Clevis, Reverse Lock, Non Power Trim
23	18-25191	COTTER PIN, Clevis Pin, Non Power Trim
24	44343T1	MOUNT, Lower, X-Long
25	10-898835001	BOLT, (M12 x 154), Lower Mount
26	12-28051	WASHER, Lower Mount Bolt
27	12-28053	WASHER, Lower Mount Bolt
28	12-30119	WASHER, (.875 Inch Outside Diameter), Lower Mount Bolt
29	11-8M0204662	NUT, (M12), Lower Mount Bolt
30	88238A10	CABLE ASSEMBLY, Ground
31	10-41508	SCREW, (.250-20 x .500) Stainless Steel, Ground Wire
32	8M0036730	CLAMP, Lower Mount
33	11-35521	NUT, Nylon, Cover Screw
34	10-40011149	SCREW, Clamp
35	67077F1	COVER, Lower Mount, Oyster
36	10-88417	SCREW, (#12-24 x .620), Cover
37	18579T6	SPLASH PLATE, Oyster

▶Electrical Components (46 parts)

Ref	OEM Part #	Part Name
1	42968A23	PLATE, Ignition
2	332-7778A12	SWITCHBOX ASSEMBLY
3	10-69079	SCREW, (#10-16 x .440), Switch Box
4	10-40007110	SCREW, (M5 x 30), Switch Box
5	23-94304	SPACER, Switch Box Screw
6	10-32,11-45076	NUT, Brass, Switch Box Terminal
7	84-41592A4	HARNESS ASSEMBLY, Primary
8	84-813715A7	CABLE SET, Ignition, High Tension
9	85-63709A1	BOOT/TERMINAL KIT, Spark Plug
10	33-14103Q	SPARK PLUG, Begium, Canada
11	10-82155025	SCREW, Ignition Plate
12	339-832757A4	COIL ASSEMBLY, Ignition
13	10-32,11-45076	NUT, Brass, Ignition Coil Terminal
14	43542	COVER, Ignition Coil
15	10-40007115	SCREW, (M5 x 55), Ignition Coil Cover
16	12-89302	WASHER, (.203 x .406 x .040), Coil Cover Screw
18	10-40056107	SCREW, (M5 x 16), Rectifier
19	10-32,11-45076	NUT, Brass, Rectifier Terminal
20	16731T01	MERCURY SWITCH ASSEMBLY
21	10-40056107	SCREW, (M5 x 16), Mercury Switch
22	86-45915	TERMINAL BLOCK
23	10-48408	SCREW, (#10-16 x .500), Terminal Block
24	84-41591A3	HARNESS ASSEMBLY, Engine
25	88-8M0207796	FUSE, 20 Ampere
26	84-88439A4	CABLE ASSEMBLY, Battery - Negative
27	8M0185622	SOLENOID, Starter
28	10-40007106	SCREW, (M5 x 13), Starter Solenoid
29	12-4002314	WASHER, Starter Solenoid Screw
30	84-88807A6	CABLE ASSEMBLY, (3.50 Inches) Black, Solenoid Screw Comment: (Quantity Of Two On Oyster)
31	13-26992	LOCKWASHER, (.250) Stainless Steel Comment: (Starter Solenoid Terminal)
32	11-64015	NUT, (.250-20), Starter Solenoid Terminal
33	8-32,11-26419	NUT, Brass, Starter Solenoid Terminal
34	84-88808A18	WIRE ASSEMBLY, (3.00 Inches), Rectifier To Solenoid, Red
35	124174	COVER, Ignition
36	10-40007114	SCREW, (M5 x 50), Ignition Cover
37	12-89302	WASHER, (.203 x .406 x .040), Ignition Cover Screw
38	134731	HOLDER, Fuse
39	68878A6	HORN ASSEMBLY, Buzzer Alarm, Electric Handle
40	68879	COVER, Electric Handle
41	10-40056107	SCREW, (M5 x 16), Electric Handle
42	8M0058226	RECTIFIER, See Note Below
43	17602A1	TERMINAL BLOCK, See Note Below
44	815279A2	REGULATOR ASSEMBLY, Voltage, Use With Reference Number 43
45	10-4010630	SCREW, Use With Reference Number 43
46	10-32,11-45076	NUT, Brass, Use With Reference Number 43
47	84-12201A2	HARNESS ASSEMBLY, Use With Reference Number 43

▶Exhaust Plate (35 parts)

Ref	OEM Part #	Part Name
-	27-43004A99	GASKET SET
1	42954A3	PLATE ASSEMBLY, Exhaust
2	17-23784	PIN, Dowel
3	42939	SEAL, Lower Cowl
4	881900T03	MOUNT, (2.375 Inch), Upper Comment: (Commercial)
5	10-81742750	SCREW, Upper Mount To Exhaust Plate
6	10-12515	SCREW, (M12 x 160), Upper Mount, Handle Models
7	12-32834	WASHER, Upper Mount Screw
8	12-8M0204648	WASHER, (1.5 x 3.05 x 0.13) Stainless Steel, Upper Mount Screw
9	11-896963	NUT, (M12), Upper Mount Screw
10	22-996642	ELBOW, Exhaust Plate
11	10-4010770	SCREW, (M8 x 70), Exhaust Plate
12	27-430086	GASKET, Exhaust Plate Comment: (Contents Of (27-43004A86) Gasket Set)
13	8141282	TUBE, Exhaust Comment: (90 - Use With WME-15 Carburetor)
14	10-4010735	SCREW, (M8 x 35), Exhaust Tube To Plate
15	8M0039075	SEAL, Exhaust Tube
16	32-430142	TUBE, Water, X-Long
17	99019	CLAMP, Water Tube Seal
18	42941001	SEAL, Water Tube, Upper
19	10-4010750	SCREW, (M8 x 50), Clamp
20	25-93221002	GROMMET, Water Tube Comment: (Contents Of (27-43004A86) Gasket Set)
21	42953A3	BRACKET ASSEMBLY, Cowl, Lower, Oyster
22	43405	SEAL, Lower, Cowl, Bracket
23	10-81742755	SCREW, Lower Cowl Bracket
24	23-48237	BUSHING, Shift Shaft
25	79932A9	SHIFT SHAFT ASSEMBLY, Upper
26	23-42994	BUSHING, Shift Shaft
27	42912A1	SHIFT LINK
28	13-29720	WAVE WASHER, Shift Shaft
29	12-24664	WASHER, (M4 x 20), Shift Shaft
30	11-401386	NUT, (M6), Shift Shaft
31	23-11289	SPACER, Shift Shaft, X-Long
32	43053	COUPLING, Shift Shaft, Non Power Trim
33	43585	COUPLING, Shift Shaft, Power Trim
34	25-8M0179867	GROMMET

▶Flywheel and Starter Motor (19 parts)

Ref	OEM Part #	Part Name
1	19-45907	PLUG, Yellow, Flywheel
2	42956A1	COVER ASSEMBLY, Flywheel
3	79022	MARKER, Timing
4	10-37572	SCREW, (.190-32 x .380), Timing Marker
5	12-72761	WASHER, (.203 x .562 x .060) Stainless Steel, Timing Marker Screw
6	11-42979	NUT, (M16), Flywheel
7	12-33001	WASHER, (.641 x 1.250 x .190), Flywheel
8	261-859234T30	FLYWHEEL ASSEMBLY
9	398-832075A5	STATOR ASSEMBLY, Stamped 398-9710A14
10	10-4007325	SCREW, (M5 x 25), Stator
11	99021A3	TRIGGER ASSEMBLY
12	50-893891T	STARTER MOTOR ASSEMBLY
13	23-8M0034918	COLLAR, Starter Motor
14	8M0043376	STOP, Rubber, Starter Motor
15	84-93388A1	CABLE ASSEMBLY, (6.00 Inches) Black, Starter Motor To Plate
16	10-69035	SCREW AND LOCKWASHER, (.250-20 x .625) Stainless Steel, Wire To Starter Motor
17	84-88439A20	WIRE, Starter Motor, Black
18	13-26992	LOCKWASHER, (.250) Stainless Steel, Starter Motor Terminal
19	11-64015	NUT, (.250-20), Starter Motor Terminal

▶Fuel Pump (34 parts)

Ref	OEM Part #	Part Name
-	27-43004A99	GASKET SET
1	14360A78	PUMP ASSEMBLY, Fuel
2	42909A4	DIAPHRAGM KIT Comment: (Contents Of (27-43004A86) Gasket Set)
3	NSS	NOT SOLD SEPARATE, Check Valve, Rubber
4	NSS	NOT SOLD SEPARATE, Gasket, Boost
5	NSS	NOT SOLD SEPARATE, Diaphragm
6	NSS	NOT SOLD SEPARATE, Gasket Pulse
7	NSS	NOT SOLD SEPARATE, Spring
8	NSS	NOT SOLD SEPARATE, Cap
9	NSS	NOT SOLD SEPARATE, Check Valve
10	NSS	NOT SOLD SEPARATE, Retainer
11	NSS	NOT SOLD SEPARATE, Spring
12	NSS	NOT SOLD SEPARATE, Cap
13	27-8M0204705	GASKET, Base Comment: (Contents Of 27-43004A86) Gasket Set
14	98768	BASE, Fuel Pump
15	98775A1	PLATE, Fuel Pump
16	21-424811	CHECK VALVE, Oil Injection
17	22-19688	FITTING
18	10-82104540	SCREW, Fuel Pump
19	10-40057134	SCREW, (M6 x 50), Fuel Pump To Crankcase
20	32-8M0108349	TUBING
21	35-816296Q2	FILTER, Fuel
22	54-816311T	TIE STRAP, Fuel Tubing
23	22-816856Q3	CONNECTOR, Fuel
24	25-145091	GROMMET, Fuel Connector
25	10-4010635	SCREW, Fuel Connector
26	89-819503A2	VALVE, Enrichner
27	32-1430165	TUBING, (38.00 Inches Bulk), Enrichner Valve
28	54-15279	CLAMP, Enrichner Valve
29	10-82127335	SCREW, (M8 x 1.25 x 35) , Clamp
30	22-64705	FITTING, Fuel Line Comment: (A = To Crankcase)
31	32-8M0108355	LINE, (57.00 Inches Bulk)
32	22-56800	PLUG, Pipe (.0625-27), Non Oil Injection
33	32-19017A1	LINE ASSEMBLY, Fuel Comment: (B = To Carburetor)

▶Gear Housing, Driveshaft (42 parts)

Ref	OEM Part #	Part Name
-	27-43004A99	GASKET SET
1	1667-9011T74	GEAR HOUSING ASSEMBLY, Oyster
2	17-8M0084244	PIN, Dowel - With Hole (.375 x .625) , Front, Quanitity Of Two On X-Long
3	10-28653	SCREW, (#10-32 x 0.25), Vent
4	19643	SEAL, Vent Screw
5	10-79953Q04	SCREW, (.375-16 x .250), Grease Filler
6	12-191833	WASHER, Fiber, Drain/Filler Screw
7	22-8M0058389	SCREW, Magnetic, Drain
8	17-43044	PIN, Dowel - Without Hole (.375 x .625), Rear, Quantity Of Two On X-Long
9	97-31640Q4	TRIM TAB ASSEMBLY
10	10-825427	SCREW, (.437-14 x 1.250), Trim Tab
11	12-45176	WASHER, (.453 x .812 x .105) Stainless Steel, Trim Tab Screw
12	43040T1	CARRIER ASSEMBLY, Roller Bearing
12A	43046	TUBE, Oiler
13	43-44484T	GEAR, Pinion (13 Teeth)
14	11-35921	NUT, (.625-18), Pinion GearTo Drive Shaft
15	760394	CAM, Shift Control
16	31-42677A1	BEARING ASSEMBLY, Tapered Roller
17	15-44492A1	SHIM SET
18	45-43032A4	DRIVESHAFT ASSEMBLY, X-Long
19	42461A1	SLEEVE/RING KIT
20	43055A4	COVER ASSEMBLY, Aluminum Cover
21	27-8M0214931	GASKET, Cover, Alluminum Cover
22	26-43036	SEAL, Oil, Lower, Plastic Cover
23	26-43035	SEAL, Oil, Upper, Plastic Cover
24	27-430331	GASKET, Cover, Alluminum Cover
25	27-430341	GASKET, Aluminum Cover, Water Pump, Plastic Cover
26	43050	FACE PLATE
27	28-8M0204723	KEY, Impeller Drive
28	47-43026T2	IMPELLER
29	817275A2	PUMP ASSEMBLY, Water
30	8M0204658	SEAL, Water Tube
31	10-8M0204707	SCREW, (M6 x 25), Cover
32	10-4000332	SCREW, (M6 x 35), Water Pump
33	12-4002315	WASHER, (6.60 X 12.5 X 1.5 mm -SS)
34	23-8M0204659	INSULATOR, Water Pump Screw
35	43049A1	SHIFT SHAFT ASSEMBLY, X-Long
36	53-29641	E RING, Shift Shaft
37	23-43052A4	BUSHING ASSEMBLY, Shift Shaft
38	25-8M0204681	O-RING, (1.424 x .103), Bushing
39	26-8M0204708	SEAL, Oil, Bushing
40	10-8M0204741	SCREW, (M6 x 20) Stainless Steel, Bushing

▶Gear Housing, Propeller Shaft (27 parts)

Ref	OEM Part #	Part Name
-	27-43004A99	GASKET SET
1	1667-9011T74	GEAR HOUSING ASSEMBLY, Oyster
41	15-44491A1	SHIM SET
42	31-30894A1	BEARING SET, Cup And Cone
43	43-12634T02	GEAR ASSEMBLY, Forward
44	31-30895T	BEARING, Needle
45	850315A1	FOLLOWER KIT, Cam
45A	30-44530	BALL
46	24-30622	SPRING
47	52-822539T	RATCHET
48	17-8M0100263	PIN, Cross, Clutch
49	24-30893	SPRING, Cross Pin Retainer
50	44-12238T	PROPELLER SHAFT
51	43-12635T	GEAR, Reverse
52	8M0168901	CARRIER ASSEMBLY, Bearing
53	25-8M0214974	O-RING, (3.609 x .139)
54	31-30956T	BEARING, Needle
55	26-8M0204670	SEAL, Inner
56	26-8M0205729	SEAL, Oil, Outer
57	31-12578T	BEARING, Needle
58	12-12577	THRUST WASHER
59	31-12576	BEARING, Thrust
60	10-4000354	SCREW, (M8 x 30), Bearing Carrier
61	12-4002317	WASHER, Bearing Carrier Screw
62	13191Q01	THRUST WASHER
63	14-816629Q	TAB WASHER, Propeller
64	11-52707Q1	PROP NUT KIT, (.750-16)

▶Induction Manifold and Reed Block (39 parts)

Ref	OEM Part #	Part Name
-	27-43004A99	GASKET SET
1	27-43004009	GASKET, Baffle Plate
2	428791	PLATE, Baffle
3	42878A2	COVER, Exhaust Manifold
4	10-82127335	SCREW, (M8 x 1.25 x 35) , Exhaust Manifold, Baffle Plate
5	42881A1	SHIFT RAIL ASSEMBLY
6	14-42981	TAB WASHER
7	10-40001134	SCREW, (M8 x 25), Shift Rail
8	988851	SLIDE, Shift Control
9	23-42994	BUSHING, Slide
10	13-29720	WAVE WASHER, Slide
11	12-24664	WASHER, (M4 x 20), Slide
12	11-401386	NUT, (M6)
13	12-35459	WASHER
14	11-401386	NUT, (M6)
15	1169-858552T2	END CAP ASSEMBLY, Lower
16	21-426585	CHECK VALVE
17	26-41953	SEAL
18	25-54029	O-RING, (2.800 x .103)
19	10-4010825	SCREW, Lower End Cap
20	27-430075	GASKET, Powerhead
22	884296T	MANIFOLD, Induction
23	42923	BRACKET, Flywheel Cover
24	10-82127335	SCREW, (M8 x 1.25 x 35) , Manifold
25	10-81742740	SCREW, Bracket And Manifold
26	16-8M0045410	STUD, Flywheel Cover
27	12-8M0204663	WASHER, Cover Stud
28	12-22887	WASHER, Cover Stud
29	11-816874	WING NUT, Cover Stud
30	16-824470	STUD, Carburetor
31	22-996642	ELBOW
32	32-8M0108349	TUBING
33	22-432881	TEE
34	8M0219198	REED BLOCK ASSEMBLY (75/80/90) Handle
35	27-139376	GASKET, Reed Block
36	34-43018A1	REED SET (75/80/90) Handle
37	14-429821	TAB WASHER
38	42924	RETAINER, Reed
39	10-4000171	SCREW, (M6 x 16), Reed To Reed Block

▶Miscellaneous Parts/Accessories (1 parts)

Ref	OEM Part #	Part Name
-	90-18313880	OWNERS GUIDE, Oyster

▶Oil Injection Components (27 parts)

Ref	OEM Part #	Part Name
1	1255-8627A7	TANK ASSEMBLY, Oil
2	99160001	BOOT, Oil Tank, Upper
3	44437	COVER
4	988952	BRACKET, Oil Tank, Upper
5	10-4010630	SCREW, Oil Tank Bracket
6	36-42653A3	CAP ASSEMBLY, Oil Tank
7	27-42999T	GASKET
8	10-12896	SCREW, (#8-18 x .310), Switch
9	87-12886A6	SWITCH ASSEMBLY, Oil Tank
10	43-430204	GEAR, Driven
11	25-8M0204667	O-RING, Oil Pump
12	32-82381335	TUBING Comment: (A = To Fuel Pump)
13	42959A2	PUMP ASSEMBLY, Oil
14	17335A3	ADAPTOR ASSEMBLY, Oil Pump
15	23-17597	BUSHING, Flanged, Adaptor
16	23-17596	BUSHING, Adaptor
17	10-82104540	SCREW, Oil Pump
18	42888	BRACKET, Oil Tank Base, Oil Tank
19	25-56291	GROMMET
20	10-82155050	SCREW, Base
21	99161	BOOT, Oil Tank Base
22	54-816311T	TIE STRAP
23	32-82381455	TUBING, Refer To Reference Number 25
24	22-73318	TEE, Plastic, Refer To Reference Number 24
25	22-44456	FITTING, Refer To Reference Number 25
26	32-9004934	TUBING, (14.50 Inches Bulk) (10.00 Inch) Refer To Reference Number 25
27	54-415823	CLAMP, Refer To Reference Number 25

▶Power Trim Components (44 parts)

Ref	OEM Part #	Part Name
1	99659A22	MANIFOLD ASSEMBLY, Oyster
2	22-56800	PIPE PLUG, Manifold
3	41493A7	TRIM CYLINDER ASSEMBLY, Oyster
4	41492A1	GUIDE ASSEMBLY
5	25-41478A1	REPAIR KIT
6	41482A2	CHECK VALVE KIT
7	1100-8M0021648	GUIDE ASSEMBLY, Trim Rod
8	878413A1	PISTON/ROD ASSEMBLY, Power Trim, Port
9	35-12184A1	TRIM FILTER ASSEMBLY
10	878414T01	PISTON/ROD ASSEMBLY, Power Trim, Starboard
11	17-821539	PIN, Groove, Trim Cylinder, Upper
12	893929A01	VALVE ASSEMBLY
12A	53-815949001	E RING
13	10-4000327	SCREW, (M6 x 14), Cover
14	12-4002315	WASHER, Cover Screw
15	99642	COVER, Manifold
16	25-48462A4	O-RING KIT
17	19-99609A1	PLUG ASSEMBLY
18	99641A1	SHAFT ASSEMBLY
19	22-56800	PIPE PLUG, Shaft
20	10-4008820	SCREW, (M6 x 20), Pump And Motor
21	13-400256	LOCKWASHER, (M6)
22	826729A10	PUMP AND MOTOR
23	99625002	SHAFT, Upper
24	97-818298Q1	ANODE ASSEMBLY
25	10-4000332	SCREW, (M6 x 35), Anode
26	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel, Anode Screw
27	8M0045383	STRIKER PLATE, Trim Shaft
28	13-58643	LOCKWASHER, (.375)
29	11-46335	NUT, (.375-24)
30	84-17201A2	CABLE ASSEMBLY, (17.00 Inches), Power Trim
31	84-88807A13	CABLE ASSEMBLY (3.50 Inch) Black
32	8M0185622	SOLENOID, Starter
33	10-40007106	SCREW, (M5 x 13), Starter Solenoid
34	8-32,11-26419	NUT, Brass, Solenoid Terminal
35	13-26992	LOCKWASHER, (.250) Stainless Steel, Solenoid Terminal
36	11-64015	NUT, (.250-20), Solenoid Terminal
37	12-4002314	WASHER, Starter Solenoid Screw
38	54-22875	CLIP, Pump Wire
39	8M0084613	C WASHER, Clip Screw
40	10-69079	SCREW, (#10-16 x .440), Clip To Transom Bracket
41	17-878267	PIN, Groove, Trim Cylinder, Lower
42	10-4000377	SCREW, (M10 x 30), Manifold
43	13-400258	LOCKWASHER, (M10) Stainless Steel, Manifold Screw

▶Power Trim Pump (9 parts)

Ref	OEM Part #	Part Name
-	826729A10	PUMP AND MOTOR
1	12659	FRAME AND FIELD KIT
2	12665	SPRING KIT, Brush
3	13506	BRUSH CARD KIT
4	12662	PUMP AND END FRAME KIT
5	126631	SEAL KIT, Pump
6	12660	END FRAME KIT
7	12661	ARMATURE KIT
8	12664	THRU BOLT KIT

▶Starter Motor(Bosch) (14 parts)

Ref	OEM Part #	Part Name
-	50-893891T	STARTER MOTOR ASSEMBLY
1	90643	DRIVE KIT
2	685753	DRIVE ASSEMBLY
3	75660	PLATE, Drive End
4	10-75385	BOLT, Thru
6	75386	ARMATURE
7	898265016	BRUSH/SPRING KIT
8	23-57387	BUSHING, Insulating
9	12-38013	WASHER, Input Stud
10	13-26992	LOCKWASHER, (.250) Stainless Steel, Input Stud
11	11-20890	NUT, (.250-20), Input Stud
12	898265014	HOLDER, Brush
13	10-68586	SCREW, Brush And Holder
14	15386001	END CAP, Commutator

▶Steering Handle Components (50 parts)

Ref	OEM Part #	Part Name
1	12022A14	BRACKET ASSEMBLY, Gray
2	79-12012A1	TACHOMETER ASSEMBLY
3	11-65110	NUT
4	16-12782	STUD, Bracket
5	15126	SPACER
6	14-12080	TAB WASHER
7	11-4002016	NUT
8	121051	GROMMET
9	84-12649A2	HARNESS ASSEMBLY
10	87-88107A5	KEY SWITCH
11	11-879755	NUT, Special - Chrome Brass, Key Switch
12	12015A1	COVER, Bracket
13	10-72169	SCREW, (#10-24 x .500), Bracket Cover
14	19-889730	PLUG
15	87-11083A4	SWITCH ASSEMBLY, Stop
16	15920Q54	LANYARD ASSEMBLY
17	8M0032846	RETANER, Stop Switch
18	10-4000358	SCREW, (M8 x 50), Shift Lever
19	14-42981	TAB WASHER
20	23-889732	BUSHING
21	12021A1	LEVER, Shift
22	12016A2	DETENT ASSEMBLY
23	16-8M0034452	STUD, (.375-24 x 1.125), Shift Lever
24	98530	KNOB, Shift Lever
25	495636	SHIFT ROD
26	48419T	ROD END
27	23-26856	BUSHING
28	12-35950	WASHER, (.273 x .437 x .031) Stainless Steel, Shift Rod
29	18-25191	COTTER PIN, Shift Rod
30	87-93479A7	SWITCH ASSEMBLY, Neutral Start
31	12609	BRACKET, Primary
32	126101	BRACKET, Switch
33	10-90342	SCREW, (#4-40 x .630), Switch To Bracket
34	4-40,11-24832	NUT, , Switch Screw
35	10-57583T	SCREW, (#8-32 x .375), Bracket To Bracket
36	12-20878	WASHER, Bracket Screw
37	8-32,11-26419	NUT, Brass, Bracket Screw
38	10-40001134	SCREW, (M8 x 25), Primary Bracket
39	894911	KEY
40	894912	KEY, Ignition
41	894913	KEY 1C
42	894914	KEY 1D
43	894915	KEY 1E
44	894916	KEY 1F
45	894917	KEY 2A
46	894918	KEY 2B
47	894919	KEY 2C
48	8949110	KEY, Ignition (2D)
49	8949111	KEY, Ignition (2E)
50	8949112	KEY, Ignition (2F)

▶Steering Handle Components(With Steering Arm) (31 parts)

Ref	OEM Part #	Part Name
1	12020A4	HANDLE ASSEMBLY, Steering Arm, Gray
2	12018A4	TUBE ASSEMBLY, Throttle
3	48414	HOUSING
4	48519	PLATE
5	27-48518	GASKET
6	10-72169	SCREW, (#10-24 x .500), Plate
7	54-889729	CLAMP, Throttle
8	10-40007112	SCREW, (M5 x 40), Throttle Clamp
9	11-816874	WING NUT, Throttle Clamp Screw
10	87-823609A15	HANDLE ASSEMBLY, Throttle
11	10-62568	SCREW, (#10-16 x .375)
12	87-823609A15	SWITCH ASSEMBLY, Stop
13	11099A1	BOOT ASSEMBLY
14	8M0221732	GRIP
15	54-648552	CLIP
16	10-72169	SCREW, (#10-24 x .500), Clip
17	8885242	CONDUIT
18	8M0026078	GUIDE TUBE
19	89578	BARREL
20	10-824081	SCREW
21	12019	CABLE ASSEMBLY
22	8M0204660	GUIDE, Cable
23	20007	ANCHOR
24	8-32,10-8M0204644	SET SCREW,
25	10-4000386	SCREW, (M10 x 100)
26	48416	CAP
27	12-4002319	WASHER
28	12-12024	WASHER, (.402 x .787 x .039 Bellevi)
29	23-146011	SPACER
30	23-812930A1	BUSHING
31	11-400214	NUT, (M10 x 1.5)

▶Swivel Bracket and Steering Arm (34 parts)

Ref	OEM Part #	Part Name
1	1499-8710T21	SWIVEL BRACKET ASSEMBLY, Oyster
2	26-87735	SEAL, Oil, Swivel Bracket, Lower
3	23-818764	BUSHING, Swivel Bracket, Lower And Upper
4	25-33466	O-RING, Swivel Bracket, Upper
5	23-67668	SPACER, Swivel Bracket, Upper
6	22-8M0169589	FITTING, Grease
7	23-821207	BUSHING, Swivel Bracket
8	10-64014	SCREW, (.250-28 x .500), Swivel Bracket
9	92876A12	LINK ASSEMBLY, Steering, Black And Gray
10	10-849838	SCREW, (.375-24 x 1.25) Comment: (Steering Link To Steering Arm 1.125 Inch Black And Gray)
11	11-8M0204726	NUT, (.375-24), Steering Link Screw, Black And Gray
12	12-34931	WASHER, (.406 x .734 x .063) Stainless Steel Comment: (Steering Link To Steering Arm Black And Gray
13	13-78854	WAVE WASHER, Bottom Yoke
14	42961T2	YOKE ASSEMBLY, Bottom, Oyster
15	53-67684	RING, Retaining, Bottom Yoke
16	12-67670	WASHER, Thrust, Swivel Bracket
17	99653	BRACKET, Shock Absorber Comment: Not Used With Power Trim
18	99619	SHAFT, Shock Absorber Comment: (Lower, Not Used With Power Trim)
19	17-821539	PIN, Groove Comment: (Shock Absorber, Not Used With Power Trim)
20	10-4000377	SCREW, (M10 x 30) Comment: (Bracket, Not Used With Power Trim)
21	13-400258	LOCKWASHER, (M10) Stainless Steel Comment: (Bracket Screw, Not Used With Power Trim)
22	97-818298Q1	ANODE ASSEMBLY Comment: (Not Used With Power Trim)
23	10-4000332	SCREW, (M6 x 35), Anode Comment: (Not Used With Power Trim)
24	12-8M0204649	WASHER, (.281 x .500 x .060) Stainless Steel, Anode Screw Comment: (Not Used With Power Trim)
25	55-99724T15	SHOCK ABSORBER Comment: (Not Used With Power Trim Oyster)
26	23-821207	BUSHING, Shock Absorber Comment: (Not Used With Power Trim)
27	99625002	SHAFT, Shock Absorber, Upper Comment: (Not Used With Power Trim)
28	99661A36	SWIVEL PIN ASSEMBLY, Stub End, Gray
28A	12079A9	SWIVEL PIN ASSEMBLY Comment: Handle Models Gray
29	8M0074846	SENDER ASSEMBLY, Trim Comment: Handle Models Oyster
30	10-852368	SCREW, (#10-24 x .750), Trim Sender, Oyster
31	10,13-26996	LOCKWASHER, Stainless Steel Comment: Trim Sendsr Score Oyster
32	12-89302	WASHER, (.203 x .406 x .040), Trim Sender Screw
33	11288001	BUMPER, Bottom Yoke (X-Long

▶Tachometer (6 parts)

Ref	OEM Part #	Part Name
1	79-895283Q43	TACHOMETER (6K)
2	79101T	BRACKET, Mounting
3	88-72729	LIGHT BULB, Wedge Base (14V - .19W)
4	88-79888	SOCKET, Light Bulb
5	8-32,11-26419	NUT, Brass
6	84-86396A8	HARNESS ASSEMBLY, Tachometer (5.00 Feet)

▶Throttle Lever And Linkage (25 parts)

Ref	OEM Part #	Part Name
1	42946T1	LEVER, Throttle
2	10-817582	SCREW, Adjusting
3	11-400211	NUT, (M5), Jam, Adjusting Screw
4	429471	LEVER, Spark Advance
5	10-814776	SCREW, Adjusting
6	11-400212	NUT, Jam, Adjusting Screw
7	42942	CAP, Nylon, Adjusting
8	16-42986	STUD, Levers
9	24-55162	SPRING, Throttle/Spark Advance Lever
10	23-812930A1	BUSHING, Lever Stud
11	12-42980	WASHER, Lever Stud
12	11-90517	NUT, (M10), Lever Stud
13	42927	INSERT, Throttle Lever
14	12-35459	WASHER, Throttle Lever Pin
15	11-401386	NUT, (M6), Throttle Lever Pin
16	878172	ROD, Spark Advance
17	93254	SWIVEL BASE
18	93421	SWIVEL BALL
19	878420T	ROD, Throttle
20	24-14159	SPRING, Cam Return
21	23-8M0215006	BUSHING, Swivel
22	42948A7	CAM, Throttle
23	16-8161949	STUD, Throttle Cam
24	12-69056	WASHER, (.255 x .620 x .030) Stainless Steel, Throttle Cam Stud
25	11-401386	NUT, (M6), Throttle Cam Stud

▶Transom Bracket (22 parts)

Ref	OEM Part #	Part Name
1	3401-8718F8	BRACKET ASSEMBLY, Transom, Starboard, Oyster
2	3400-8716A9	BRACKET ASSEMBLY, Transom, Port
3	22-8M0169588	FITTING, Grease, Port, Transcom Bracket
4	17-8M0026068	PIN ASSEMBLY, Tilt Lock, Non-Power Trim
5	99170A2	TILT TUBE
6	11-859133	NUT, Tilt Tube (1"-14) Gray
7	25-45711	O-RING, (.612 x .103), Tilt Tube
8	13-88750	WASHER, Tilt Tube
9	11-858869	NUT, (.875-14), Tilt Tube (.875)
10	10-8M0149747	SCREW, (.500-20 x 4.500), Transom Bracket To Transom
11	12-24501	WASHER, Transom Bracket Bolt Comment: (Upper, Oyster)
12	11-91962	NUT, (.500-20), Transom Bracket Bolt
13	8M0115104	LEVER ASSEMBLY, Tilt Lock
14	13-99611	WAVE WASHER, Tilt Lever
15	23-65830	NYLINER, Tilt Lever
16	99633	KNOB, Tilt Lock Lever, Oyster
17	17-99615	PIN, Groove
18	24-99622	SPRING
19	17-99604	PIN, Groove
20	10-96930A1	BOLT ASSEMBLY, Tilt Lock, Power Trim
21	11-23161	NUT, (.375-24), Power Trim
22	11-8M0041651	NUT, (.875-14), Power Trim

100-Hour / Annual Service Checklist

Regular maintenance keeps your Mercury 90 (3 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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