Tohatsu M90A2 (2013) Parts & Diagrams

OEM and aftermarket replacement parts for Tohatsu M90A2. Scroll down for exploded parts diagrams (25), specifications, and maintenance reference.

Tohatsu M90A2 (2013) Parts & Diagrams

🔎 Tohatsu M90A2 Reference Library — Exploded parts diagrams (25 diagrams), specifications, common issues, and maintenance checklist.

The Tohatsu M90A2 is a 2-Stroke outboard motor. Suited for bay boats, pontoons, and center-console fishing boats requiring reliable mid-range power.

Quick Reference Specifications

Specification Value
Engine Type 2-Stroke
Horsepower 90 HP
Displacement 1358
Bore x Stroke 86 x 72.7
Spark Plug (Type & Gap) NGK BR8HS-10
Engine Oil Capacity
Recommended Engine Oil TC-W3 Certified 2-Stroke Oil
Gear Case Oil Capacity
Idle Speed (in gear)
Full Throttle RPM Range 5000-5500
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 Tohatsu M90A2:

  • 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
  • Fuel System Issues / Hard Starting: Stale fuel and ethanol-related deposits are common in 2-stroke carbureted engines. Clean or rebuild carburetors and replace fuel lines if deteriorated. → Recommended: Carburetor Repair Kit, Fuel Line Assembly
  • Spark Plug Fouling: 2-stroke engines are prone to spark plug fouling from oil residue, especially at low RPM. Replace plugs at each annual service. → Recommended: OEM Spark Plugs
  • 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
  • Thermostat Failure: A stuck thermostat can cause overheating or poor warm-up. Replace if operating temperature is inconsistent. → Recommended: Thermostat Assembly

Parts Diagrams & OEM Part Numbers

Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Tohatsu M90A2.

ACCESSORIES (20 parts) ACCESSORIES
Ref OEM Part # Part Name
1 3C8-72100-1 TOOL KIT
2 3B7-72201-0 SAFETY ROPE φ6-1600
3 3A3-72537-1 METER LEAD WIRE L=2000
4 3N8-72640-1 TACHOMETER W/OIL LAMP
5 3B7-72658-0 * OIL BULB 12V-1.7W
6 3B7-72659-0 * METER BULB 12V-1.8W
7 3B7-72656-0 * METER DAMPER
8 3B7-72661-0 * FITTING PLATE
9 930103-0500 * NUT
10 941303-0500 * SPRING WASHER
11 3T1-72571-0 TRIM METER ASSY
12 3T1-72659-0 * METER BULB 12V-1.7W
13 3T1-72653-0 * METER BULB CAP
14 3B7-72655-0 * METER DAMPER
15 3T1-72665-0 * FITTING PLATE
16 941303-0400 * SPRING WASHER
17 930203-0400 * NUT
18 3B7-72043-0 OIL CAUTION DECAL
19 3B7-72051-0 BUZZER CAUTION DECAL
20 3B7-60007-0 FLUSHING PLUG
ASSEMBLY・KIT PARTS (7 parts) ASSEMBLY・KIT PARTS
Ref OEM Part # Part Name
1 3B7Q87304-C LOWER UNIT ASSY (UL)
2 3MRB87090-0 ENGINE SHORT BLOCK KIT
3 922503-6414 * SCREW
4 3T9-02242-0 * AIR CHAMBER GASKET
5 3B7-65239-1 * WATER PUMP GUIDE PLATE
6 3C7-60223-1 * OIL SEAL 22-42-7
7 98AL-40-920 * HOSE
BOTTOM COWL (37 parts) BOTTOM COWL
Ref OEM Part # Part Name
1 353Q67100-6 BOTTOM COWL
2 3BA-01138-0 NIPPLE
3 98AB-50-450 HOSE
4 3B7-76142-1 GROUND CABLE L=120
5 309-06972-0 CLAMP 6.5-47.5P
6 910103-6612 BOLT
7 345-67113-0 MOUNT 12-18-2.5
8 346-67114-1 SPACER 6.2-9-15.7
9 3B7-67164-0 GROMMET
10 353-67165-0 GROMMET
11 353-67166-0 GROMMET 20-7.2
12 345-67161-0 GROMMET 22-3
13 910103-6616 BOLT
14 3B7-83720-0 CLIP
15 338-67179-0 DRAIN PLUG (ENGINE BASEMENT)
16 3B7-76116-0 GROMMET
17 345-66226-0 GROMMET 17-3
18 3B7-77156-0 GROMMET
19 3B7-67083-0 GROMMET
20 350-67154-0 PLASTIC RIVET 6.5
21 910121-0610 BOLT
22 910121-0812 BOLT
23 353-67512-0 COVER STAY (FRONT)
24 353-67513-0 COVER STAY (REAR)
25 910103-6618 BOLT
26 940103-0600 WASHER
27 3B2-70260-1 FUEL CONNECTOR (MALE)
28 931103-1000 NUT
29 336-70112-0 GASKET 10.2-16-0.5
30 98AB-50-380 HOSE
31 338-02215-0 CLIP φ10
32 3B7-76117-0 CLAMP
33 910103-6614 BOLT
34 3B7-83732-0 GROMMET
35 9101E3-0630 BOLT
36 346-67115-0 WASHER 6.5-21-1
37 3A3-72026-0 SPARK PLUG DECAL (BR8HS10)
BRACKET (84 parts) BRACKET
Ref OEM Part # Part Name
1 3E0-62191-1 SWIVEL BRACKET SHAFT ASSY
2 346-62124-1 NYLON NUT 7/8-14
4 940103-0600 WASHER
5 3E0Q62112-0 CLAMP BRACKET (R)
6 3E0Q62113-1 CLAMP BRACKET (L)
7 9102E3-1020 BOLT
8 9402E3-1000 WASHER
9 3E0-62121-1 THRUST ROD
10 3B7-62129-1 PIN
11 3E0Q62313-3 SWIVEL BRACKET ASSY
12 344-67177-1 * GREASE FITTING
14 3E0-62116-1 WASHER 25.7-50-1
15 3E0-62126-0 BUSHING 25.6-28.6-40
16 3B7Q62010-2 STEERING SHAFT ASSY
17 3B7-62414-0 SEAL RING
18 3B7-62417-0 BUSHING 32-40-45
19 3B7-62423-1 THRUST PLATE (UPPER)
20 945103-3200 C-RING d=32
21 3B7-62415-0 O-RING 4.5-32
22 3B7-62096-0 STEERING ARM DAMPER L=40
23 3B7-61301-0 RUBBER MOUNT (UPPER)
24 3B7-61307-2 BOLT 7/16-115
26 3B7-61335-0 WASHER 11.5-32-3
27 3B7-61341-1 MOUNT HOLDING PLATE (UPPER)
28 9101E3-5835 BOLT
29 3B7-61339-0 DAMPER (UPPER)
30 910103-0625 BOLT
31 3C8-66308-0 WASHER 6-16-1.5
32 3B7Q61411-2 MOUNT BRACKET
33 353-61302-2 RUBBER MOUNT (LOWER)
34 353-61321-3 BOLT
36 3C7-61338-0 DAMPER 21-36-5
37 353-61315-1 WASHER 12.2-25-2
38 3B7-61324-0 NUT 12-P1.5
39 9402E3-1200 WASHER
40 3B7Q61342-0 MOUNT HOLDING PLATE (LOWER)
41 3N4-61343-0 BOLT 8-25
42 353-61336-0 DAMPER (LOWER)
43 3C7-60218-2 ANODE
44 910103-6630 BOLT
45 398-62396-1 GROUND L=130
46 910103-5612 BOLT
47 3A3-62396-1 GROUND L=110
48 9101E3-5612 BOLT
49 3C8-62396-1 GROUND L=210
50 3Y9-62431-1 TILT STOPPER ASSY
51 951403-3516 * SPRING PIN 3.5-16
52 3T1-61315-0 * WASHER 10.5-18-2
53 3Y9-62433-0 * TILT STOPPER GRIP
54 3E0-62473-1 TILT STOPPER SPRING
55 353-63207-0 COLLAR 10.2-12-12
56 3E0-84905-0 DRAG LINK ASSY
57 3E0-84914-0 * SPACER
58 3E0-84917-0 * BOLT 3/8-50
59 353-84918-0 * NYLON NUT 3/8-24UNF
60 353-84916-0 * WASHER 9.6-18-2
61 3F3-84908-0 * SEAL RING
62 3E0-77150-1 PTT ASSY
64 3C8-77071-1 CYLINDER PIN (UPPER)
65 345-05122-1 WASHER 6.5-23-1.5
66 9101E3-0612 BOLT
67 3C8-77075-0 BUSHING 18-24-19
68 3E0-77076-0 BUSHING 18-20-20.5
69 369-60218-1 ANODE
70 910103-5616 BOLT
71 3T1-72574-0 TRIM SENSOR L=1700
72 9101E3-0620 BOLT
73 3R0-66308-0 WASHER 6-16-1.5
74 353-84398-0 BAND 100
75 309-06972-0 CLAMP 6.5-47.5P
76 910103-0612 BOLT
77 3B7-77085-1 BOLT 12-20 P1.75
79 3E0-77101-1 CYLINDER PIN (LOWER)
80 346-62412-1 WASHER 22.6-30-2
81 945103-2200 C-RING d=22
82 3E0-77103-0 BUSHING 22-25.4-23.5
83 345-06915-0 CLAMP 6.5-14L
84 9215E3-5612 SCREW
85 3T1-72573-0 EXTENSION CORD (TRIM SENSOR) L=6000
86 3C8-72120-0 RIGGING BOLT SET
87 3C7-62133-2 * BOLT 12-105 P1.25
88 353-61334-0 * WASHER 13-34-3
89 940103-1200 * WASHER
90 3C7-62139-1 * NUT 12-P1.25
COMPONENT PARTS OF REMOTE CONTROL (48 parts) COMPONENT PARTS OF REMOTE CONTROL
Ref OEM Part # Part Name
1 3ACQ84330-0 REMOTE CONTROL HEAD ASSY (RC5A)
2 3A3-84432-0 * BUSHING
3 3A3-84375-0 * SCREW
4 3A3-84374-0 * SPACER
5 353-84371-0 * WASHER
6 930103-0600 * NUT
7 3A3-84383-0 * WASHER
8 3A3-84421-0 * ROLLER
9 3A3-84422-0 * THRUST PLATE
10 3A3-84431-0 * BUSHING
11 940103-0800 * WASHER
12 3A3-84442-0 * BOLT
13 353-84388-0 * DETENT ROLLER
14 3B7Q84312-0 * FREE THROTTLE LEVER
15 921503-0406 * SCREW
16 3A3-84423-0 * DETENT RETAINER
17 921603-0518 * SCREW
18 3A3-84307-0 * DETENT SPRING
19 921603-0512 * SCREW
20 3A3-84424-0 * FREE THROTTLE ROLLER
21 3A3-84426-0 * ROLLER RETAINER
22 3A3-84425-0 * FREE THROTTLE SPRING
23 3A3-84365-1 * THROTTLE ARM
24 3A3-84428-0 * THROTTLE FRICTION ARM
25 945303-0600 * E-RING d=6
26 353-84394-0 * WASHER
27 3A3-84427-0 * ADJUST SCREW
28 3A3-84381-0 * SHIFT GEAR ASSY
29 3A3-83314-2 * CABLE TERMINAL
30 3A3-84364-2 * DRIVE GEAR
31 3A3-84429-0 * WIRE COVER
32 930103-0500 * NUT
33 910103-0525 * BOLT
34 3A3-84376-0 * GROMMET
35 3B7Q84441-0 * REAR HOUSING
36 3B7Q84366-0 * REAR PANEL
37 3A3-84401-0 * NEUTRAL LOCK ARM
38 3A3-84403-0 * NEUTRAL LOCK SPRING
39 3A3-84407-0 * WASHER
40 921503-0510 * SCREW
41 3A3-84451-0 * TILT SWITCH COVER
42 3A3-84404-0 * GRIP
43 3B7Q84343-0 * CONTROL LEVER
44 3A3-84452-0 * TILT SWITCH PLUG
45 3A3-84368-0 * WAVE WASHER
46 3A3-84391-0 * FREE THROTTLE DRUM
47 3A3-84435-0 * BUSHING
48 3A3-84406-0 * PLATE
COMPONENT PARTS OF REMOTE CONTROL (ELECTRIC PARTS) (17 parts) COMPONENT PARTS OF REMOTE CONTROL (ELECTRIC PARTS)
Ref OEM Part # Part Name
1 3A3-76086-1 NEUTRAL SWITCH (REMOTE CONT)
2 921503-0315 SCREW
3 3C8-76171-0 OVERHEAT BUZZER
4 3A3-84398-0 BAND
5 3A3-76115-1 CORD ASSY L=6200
6 3A3-06830-0 STOP SWITCH ASSY
7 353-06821-0 * STOP SWITCH LANYARD ASSY
8 353-76020-3 MAIN SWITCH ASSY
9 3F3-76219-0 * MAIN SWITCH KEY No.303
10 3A3-72560-0 PTT SWITCH ASSY
11 921503-0206 SCREW
12 3A3-72591-0 PTT SWITCH COVER
13 3N5-84336-0 SHIFT POSITION DECAL
14 3N5-84465-0 SHIFT POSITION SIDE DECAL
15 3N5-84331-0 DECAL (LEVER)
16 3N5-84333-0 DECAL (TOHATSU)
17 353-72546-0 ASSIST CORD (RED) L=200
CYLINDER・CRANK CASE (57 parts) CYLINDER・CRANK CASE
Ref OEM Part # Part Name
1 3MRB01100-0 CYL BLOCK & CRANKCASE ASSY
2 393-01137-0 * NIPPLE
3 915324-1065 * STUD
4 345-01111-0 * DOWEL PIN 6-12
5 345-00117-0 * DOWEL PIN
6 393-01131-0 * NIPPLE 5.5-5
7 931121-1000 * NUT
8 916129-1065 * BOLT
9 3B7-01116-0 * WASHER 10.5-20-3.2
10 916124-0850 * BOLT
11 916124-0865 * BOLT
13 3B7-60218-1 ANODE
14 910103-5630 BOLT
15 910103-0630 BOLT
16 930103-0600 NUT
17 3B7B01001-0 CYLINDER HEAD
18 3B7-01024-2 CYLINDER HEAD COVER GASKET
19 3B7B01021-0 CYLINDER HEAD COVER
20 910121-6630 BOLT
22 3C7-01030-0 THERMOSTAT
23 3B7B01031-0 THERMOSTAT CAP
24 353-01032-0 THERMOSTAT CAP GASKET
25 9101E3-5640 BOLT
26 3B7-01046-0 PLUG
27 3B7-01005-1 CYLINDER HEAD GASKET
28 9161F9-0860 BOLT
29 345-01015-0 WASHER 8.5-19.5-3.2
30 3B7-01513-0 HANGER
31 9101F4-0820 BOLT
32 3MRB02300-1 EXHAUST COVER ASSY
33 369-60218-1 ANODE
34 910103-0616 BOLT
35 3FW-01143-0 ANODE PLUG
36 3FW-01146-0 SEAL RING
38 3FW-02305-0 EXHAUST COVER GASKET
39 9101E3-5625 BOLT
40 3B7B05101-0 BRACKET
41 9161F4-0845 BOLT
42 353B76006-2 STARTER MOTOR BRACKET
43 941322-0800 SPRING WASHER
44 9701-1-1016 SPARK PLUG (BR8HS10)
45 393-01160-0 CHECK VALVE
46 98AL-40-280 HOSE
47 98AL-40-325 HOSE
48 98AL-40-420 HOSE
49 98AL-40-440 HOSE
50 338-01133-0 CLIP φ7
52 309-06972-0 CLAMP 6.5-47.5P
53 353-06972-0 CLAMP 7-80P
54 910103-6612 BOLT
55 3B7-76093-0 GROMMET 25-5
56 3B7-01303-4 ENGINE BASEMENT GASKET
57 3B7-01291-2 CRANKCASE HEAD
58 171-00053-0 O-RING 2-74.5
59 3B7-00121-0 OIL SEAL 35-58-9
60 3C7-01215-0 OIL SEAL 19.6-35-10
61 910103-5620 BOLT
DRIVE SHAFT HOUSING (35 parts) DRIVE SHAFT HOUSING
Ref OEM Part # Part Name
1 3B7Q01301-0 ENGINE BASEMENT
2 3B7-67179-0 DRAIN PLUG (ENGINE BASEMENT)
3 3B7-67116-0 ENGINE BASEMENT SEAL L=690
4 3B7Q61192-4 DRIVE SHAFT HOUSING (L)
5 3B7-61017-3 BOLT 8-105
6 3B7-61018-2 BOLT 8-115
8 3B7-61012-2 DRIVE SHAFT HOUSING GASKET
9 3B7Q61110-0 EXTENSION HOUSING
10 3T1-60001-1 BOLT 8-35
11 3B7-60001-5 BOLT 10-40
12 3B7-61112-1 STUD 10-165
13 9401E3-0800 WASHER
14 9402E3-1000 WASHER
15 9153E3-0825 STUD
16 930103-0800 NUT
17 3B7-61114-0 NUT 10-P1.25
18 345-01111-0 DOWEL PIN 6-12
19 910103-5635 BOLT
20 3B7-02311-0 EXHAUST PIPE
21 9101F4-0635 BOLT
22 940103-0600 WASHER
23 941303-0600 SPRING WASHER
24 3B7-02312-2 EXHAUST PIPE GASKET
25 3B7-61181-2 EXHAUST HOUSING GASKET
26 3B7-61186-0 REVERSE GAS PASSAGE PIPE
27 3D8-61180-0 EXHAUST HOUSING
28 3B7-61182-1 GROMMET
29 3B7-61207-0 IDLE EXHAUST PORT GROMMET
30 910103-0830 BOLT
31 940203-0800 WASHER 8.4-15.5-1.6
32 3C7Q61210-1 APRON
33 3C7-61212-0 GROMMET
34 3E0-61213-0 SEAL
35 3C7-61216-0 PAD
36 9101E3-5612 BOLT
ELECTRIC PARTS (C.D. UNIT) (26 parts) ELECTRIC PARTS (C.D. UNIT)
Ref OEM Part # Part Name
1 3B7-06901-2 BRACKET
2 910103-0625 BOLT
3 930103-0600 NUT
4 3B7-63734-0 STOPPER DAMPER
6 346-67113-0 MOUNT 8.5-14-2.5
7 3B7-06920-0 RUBBER MOUNT 8.5-14-2.5
8 346-67114-1 SPACER 6.2-9-15.7
9 3B7-06160-2 CD UNIT
10 3B7-06165-0 CD UNIT BAND
11 3MR-06049-0 IGNITION COIL ASSY W/LABEL
15 3C8-72181-0 * CAUTION DECAL (B)
16 3MR-06050-0 IGNITION COIL W/CAP
17 3M2-06921-0 * PLUG CAP
18 3M2-06926-0 * PLUG CAP TERMINAL
19 3T5-84398-0 * BAND 104
20 910103-5620 BOLT
21 3B7-76142-1 GROUND CABLE L=120
22 353-76213-0 SPARE FUSE 20A
23 353-06972-0 CLAMP 7-80P
24 910103-6612 BOLT
25 910103-6630 BOLT
26 346-67115-0 WASHER 6.5-21-1
27 3B7-06902-1 COVER
28 3B7-72028-1 WIRING DIAGRAM DECAL
29 910103-7620 BOLT
30 3C7-06921-0 PLUG CAP W/RESISTANCE
ELECTRIC PARTS (STARTER MOTOR) (46 parts) ELECTRIC PARTS (STARTER MOTOR)
Ref OEM Part # Part Name
1 3B7-76065-5 RECTIFIER COMPLETE
2 910103-5625 BOLT
3 309-06972-0 CLAMP 6.5-47.5P
4 346-76040-0 STARTER SOLENOID
5 910103-6616 BOLT
6 3C8-72580-0 PTT SOLENOID SWITCH (A)
7 3C8-72581-0 PTT SOLENOID SWITCH (B)
8 3C8-72583-1 SOLENOID SWITCH CORD (B) L=150
9 3B7-72582-1 SOLENOID SWITCH CORD (A) L=150
10 3C7-72583-0 SOLENOID SWITCH CORD (B) L=150
12 3B7-76110-0 CORD ASSY
13 3C7-76062-1 FUSE WIRE ASSY L=450
14 353-76010-4 STARTER MOTOR ASSY
15 353-76012-3 * POSITIVE BRUSH
16 353-76013-3 * NEGATIVE BRUSH
17 353-76017-1 * BRUSH SPRING
18 353-76015-1 * PINION ASSY
19 910103-6835 BOLT
20 353-76007-1 DAMPER
21 353B76009-2 STARTER MOTOR BAND
22 9101E3-5840 BOLT
23 910103-0820 BOLT
24 940103-0800 WASHER
25 3B7-76141-1 STARTER CABLE L=400
26 3A3-76145-0 TERMINAL CAP
27 3B7-76120-2 BATTERY CABLE L=3000
28 3B7-76145-0 TERMINAL CAP
29 353-76050-2 CHOKE SOLENOID
30 353-76073-0 * PLUNGER
31 353-76057-2 CHOKE SOLENOID HOOK
32 951403-0312 SPRING PIN 3-12
33 910103-6625 BOLT
34 122-35083-0 RUBBER MOUNT 9-23-4
35 353-76079-0 COLLAR 6.2-9-9.3
37 3B7-76172-1 OVERHEAT SENSOR ASSY
38 3B7-76180-3 PRESSURE SWITCH ASSY
39 921503-6314 SCREW
40 921503-7414 SCREW
41 921503-6410 SCREW
42 910103-6630 BOLT
43 346-67113-0 MOUNT 8.5-14-2.5
44 3B7-06920-0 RUBBER MOUNT 8.5-14-2.5
45 346-67114-1 SPACER 6.2-9-15.7
46 346-67115-0 WASHER 6.5-21-1
47 98AB-70-250 HOSE
48 345-70114-1 CLIP φ11.3
FUEL LINE (22 parts) FUEL LINE
Ref OEM Part # Part Name
1 356-04000-1 FUEL PUMP ASSY
2 334-04004-0 * PUMP COVER
3 9225F2-6528 * SCREW
4 334-04005-0 * PUMP DIAPHRAGM
5 334-04007-0 * DIAPHRAGM GASKET
6 356-04044-0 * CHECK VALVE
7 921722-0306 * SCREW
8 930222-0300 * NUT
9 356-04030-0 * DIAPHRAGM GASKET SET
10 346-04901-2 GASKET
11 921503-6640 SCREW
12 3AD-02230-0 FUEL FILTER ASSY
13 3AD-02237-0 * CUP
14 3AD-02235-0 * O-RING
15 3AD-02234-0 * FILTER
16 930103-0800 NUT
17 941303-0800 SPRING WASHER
18 98AB-50-270 HOSE
19 98AB-50-150 HOSE
20 98AB-50-440 HOSE
22 338-02215-0 CLIP φ10
23 3C8-09075-0 CHECK VALVE COMPLETE
FUEL TANK (17 parts) FUEL TANK
Ref OEM Part # Part Name
1 3B7-70200-4 PRIMER BULB ASSY
2 3C7-70220-1 * JOINT ASSY (INLET)
3 3C7-70224-1 * JOINT ASSY (OUTLET)
4 3C7-70211-1 * PRIMER BULB
5 3C7-70217-0 * CLAMP
6 98AB-70-700 * HOSE
7 98AB-701600 * HOSE
8 3B7-70280-1 * FUEL CONNECTOR MARK
9 3GF-70281-0 * FUEL CONNECTOR
10 3GF-70250-0 * FUEL CONNECTOR
11 332-70201-0 * CLAMP
12 3C7-70177-1 FUEL TANK ASSY 25L
13 3C7-70155-0 * PICK-UP ELBOW ASSY (25L)
14 3C7-70199-0 * O-RING
15 3C7-70113-0 * FILTER
16 3C7-70050-1 * FUEL GAUGE VENT CAP ASSY (25L)
17 3E0-70270-0 * QUICK-CONNECTOR (MALE)
GEAR CASE (DRIVE SHAFT) (60 parts) GEAR CASE (DRIVE SHAFT)
Ref OEM Part # Part Name
1 3B7Q60000-4 GEAR CASE ASSY
2 3B7-60102-0 * ROLLER BEARING 25.4-33.3-31.8
3 332-60005-2 PLUG 8-8
4 332-60006-0 GASKET 8.1-15-1
5 3B7-60217-1 TRIM TAB
6 3B7-60219-0 TRIM TAB GASKET
7 915303-0825 STUD
8 940103-0800 WASHER
9 930403-0800 NYLON NUT 8-P1.25
10 3B7-60012-1 GEAR CASE PLATE
11 9216E3-0614 SCREW
12 3B7-60013-0 GEAR CASE PLATE PLUG
13 3B7-60015-1 PLUG
14 3B7-60016-1 GASKET 10.1-15-1
15 3B7-64020-0 BEVEL GEAR B
16 353-64016-0 SHIM 52-60.5-0.1
17 3B7-64027-0 NUT
18 3B7-64303-1 DRIVE SHAFT (UL)
19 3B7-60213-0 TAPERED ROLLER BEARING 32305
20 353-64327-0 DRIVE SHAFT SPRING
21 3B7-65021-2 WATER PUMP IMPELLER
22 3B7-65022-1 KEY
23 3B7-65016-0 PUMP CASE SUB-ASSY (UPPER)
24 3B7-65238-0 PUMP CASE LINER
25 3B7-65014-0 WATER PIPE SEAL (LOWER)
26 3B7-65018-0 PUMP CASE GASKET
27 3B7-65017-2 PUMP CASE (LOWER)
28 3C7-60223-1 OIL SEAL 22-42-7
29 346-64084-0 SHIM 35-41.9-0.5
30 3B7-65015-0 O-RING 3.1-54.4
31 334-65012-0 DOWEL PIN 4-10
32 9161E3-0880 BOLT
33 3B7-65239-1 WATER PUMP GUIDE PLATE
34 3B7-65029-0 GUIDE PLATE GASKET
35 3B7-64328-0 DRIVE SHAFT SPRING GUIDE
36 3B7-66011-1 CLUTCH CAM
37 3B7-66014-1 CAM ROD (UL)
38 951403-3510 SPRING PIN 3.5-10
39 3B7-66031-1 CAM ROD BUSHING
40 345-66021-0 O-RING 1.9-6.8
41 3B7-66023-0 O-RING 3.5-27.7
42 353-66241-1 SHIFT ROD JOINT
44 353-66024-0 STOPPER
45 910103-6612 BOLT
46 3T1-60001-1 BOLT 8-35
47 3B7-60001-5 BOLT 10-40
48 9401E3-0800 WASHER
49 9402E3-1000 WASHER
50 3C7-60017-0 NIPPLE 6-1/8
51 98AL-40-920 HOSE
52 3C7-60018-0 NIPPLE 6-6
53 353-84398-0 BAND 100
54 346-65204-0 WATER PIPE AUXILIARY MOUNT
55 951403-3516 SPRING PIN 3.5-16
56 3B7-65120-0 WATER PIPE (UL)
57 345-65206-0 WATER PIPE SEAL (UPPER)
58 345-65205-0 COLLAR 18-20-4.5
59 3C7-60205-1 WATER STRAINER SET
60 921503-0445 * SCREW
61 930403-0400 * NYLON NUT 4-P0.7
GEAR CASE (PROPELLER SHAFT) (28 parts) GEAR CASE (PROPELLER SHAFT)
Ref OEM Part # Part Name
1 3C7-60215-0 TAPERED ROLLER BEARING 30209
2 3B7Q87323-1 PROPELLER SHAFT HOUSING ASSY
3 3B7Q60101-1 * PROPELLER SHAFT HOUSING
4 3B7-60211-0 * ROLLER BEARING 30-40-30
5 3B7-60111-0 * OIL SEAL 30-50-12
6 9601-0-6208 * BALL BEARING 6208
7 3B7-60103-0 * O-RING 3.1-94.4
8 3C7-60108-2 PRE-COATED BOLT 8-30
9 3D8-64010-0 BEVEL GEAR ASSY (A)
10 3B7-64011-0 * ROLLER BEARING 25-32-26
11 3T1-64093-0 BEVEL GEAR C
12 3B7-64016-0 SHIM 47-57-0.1
13 3B7-64035-0 WASHER t=2.8
14 3B7-64037-0 SHIM 42-50-0.1
15 3B7-64211-0 PROPELLER SHAFT
16 3T1-64215-2 CLUTCH
17 3B7-64218-0 PIN
18 3B7-64219-1 SNAP
19 3T1-64222-0 SPRING RETAINER L=30.5
20 346-64221-0 SPRING
21 3T1-64223-0 PUSH ROD
22 3T1-64224-0 BALL
23 353-64121-0 PROPELLER NUT
24 345-64124-0 WASHER 17-32-3
25 951503-0325 SPLIT PIN 3-25
26 3HKB64545-0 PROPELLER ASSY (21")
27 3HK-64238-0 * PROPELLER HUB KIT
28 3HK-64235-0 ** FORWARD THRUST WASHER
INTAKE MANIFOLD・REED VALVE (9 parts) INTAKE MANIFOLD・REED VALVE
Ref OEM Part # Part Name
1 3B7B02010-3 INTAKE MANIFOLD ASSY
2 915321-0618 * STUD
3 98AB-70-080 HOSE
4 98AB-70-180 HOSE
5 345-70114-1 CLIP φ11.3
6 3T9-02104-0 INTAKE MANIFOLD GASKET
7 3T9-02242-0 AIR CHAMBER GASKET
8 910121-7635 BOLT
9 3A3-02100-0 REED VALVE ASSY
INTAKE SILENCER・CARBURETOR (52 parts) INTAKE SILENCER・CARBURETOR
Ref OEM Part # Part Name
1 3B7-02410-0 INTAKE SILENCER SUB-ASSY
2 3B7-67152-0 CHOKE LEVER
3 941403-1000 WAVE WASHER d=10
4 910103-0610 BOLT
5 346-67115-0 WASHER 6.5-21-1
6 910103-0630 BOLT
8 3B7-63734-0 STOPPER DAMPER
9 3B7-72015-0 CHOKE DECAL
10 346-02414-2 INTAKE SILENCER GASKET
11 345-02417-1 INTAKE SILENCER LOCK PLATE
12 910121-0618 BOLT
13 3B7-02415-0 INTAKE SILENCER COVER
14 3B7-02418-1 GASKET
15 910103-5620 BOLT
16 3L9-03210-0 CARBURETOR ASSY (THIRD)
17 353-03221-0 * FLOAT CHAMBER
18 346-03222-0 * FLOAT CHAMBER O-RING
19 922503-6414 * SCREW
20 346-03231-0 * FLOAT
21 346-03232-0 * FLOAT ARM PIN
22 3B7-03240-0 * FLOAT VALVE
23 344-03244-0 * CLIP
24 3F3-03234-0 * SCREW
25 3L9-03252-0 * MAIN NOZZLE
26 3B7-03251-0 * MAIN JET (#150)
27 3C7-03255-0 * SLOW JET (#75)
28 346-03256-0 * RUBBER CAP
29 346-03265-0 * STOP SCREW
30 346-03267-0 * SPRING
31 346-03266-0 * PILOT SCREW
32 353-03268-0 * SPRING
33 345-03292-0 * DRAIN SCREW
34 336-03293-0 * O-RING
35 334-03242-0 * VALVE PIN
36 3C7-03181-0 * CARBURETOR COVER
37 3C7-03182-0 * CARBURETOR COVER GASKET
38 3C7-03183-0 * CARBURETOR COVER GASKET
39 3C7-03184-0 * COVER GASKET PLATE
40 3C7-03185-0 * COVER GASKET PLATE
41 3C7-03186-0 * SCREW
42 930103-0600 NUT
43 941303-0600 SPRING WASHER
44 346-02011-1 CARBURETOR GASKET
45 353-67191-1 CHOKE ROD
46 345-05223-1 ROD SNAP 3.5-2
47 3C7-03271-1 O-RING 1.5-2.5
48 98AB-50-100 HOSE
49 338-02215-0 CLIP φ10
50 353-63709-1 THROTTLE ROD
51 3B7-05229-0 BALL JOINT CONNECTOR
52 3B7-05243-0 BALL JOINT CONNECTOR
53 930103-0500 NUT
MAGNETO (28 parts) MAGNETO
Ref OEM Part # Part Name
1 3B7-06101-1 FLYWHEEL W/RING GEAR
2 3B7-06103-3 COIL PLATE ASSY W/ALTERNATOR
3 3B7-06130-2 * PULSAR COIL & PLATE ASSY
4 3B7-06131-0 * PULSAR HOLDER
5 3B7-06120-1 * EXCITER COIL
6 921521-6630 * SCREW
7 3B7-06123-1 * ALTERNATOR ASSY
8 3B7-06135-0 * HOLDER
9 921521-0406 * SCREW
10 3B7-06132-0 * CLAMP
11 921521-6406 * SCREW
12 3B7-06133-0 * BAND
13 346-63722-2 GUIDE PLATE
14 910121-6616 BOLT
15 334-00131-0 KEY
16 353-00132-0 NUT 18-P1.5
17 353-00133-0 WASHER 19-34-3
18 921503-6510 SCREW
19 3B7-63723-0 SETTING RING
20 3B7-05244-0 BALL JOINT
21 941303-0600 SPRING WASHER
22 951703-0500 SNAP RETAINER d=5
23 3C7-06301-0 RING GEAR COVER
24 3C7-72182-2 CAUTION DECAL (C)
25 910103-0616 BOLT
26 910103-0625 BOLT
27 3GF-06304-0 COLLAR 9.1-16-10.8
28 3B7-06305-0 RUBBER MOUNT 9-16-4.3
OIL PUMP (AUTO MIXING) (37 parts) OIL PUMP (AUTO MIXING)
Ref OEM Part # Part Name
1 3B7-09000-1 OIL PUMP ASSY
2 3B7-09002-0 * O-RING 1.6-19.2
3 3B7-09004-0 * AIR VENT BOLT
4 3B7-09006-0 * WASHER
5 3B7-09050-0 OIL PUMP BOLT
7 3B7-09065-0 OIL PUMP DRIVEN GEAR
8 3B7-09069-0 BUSHING 9-20-20.8
9 99AA-4-0480 PIPE
10 3C7-09056-1 CLIP φ8.5
11 3B7-09053-1 OIL PUMP ROD
12 3B7-05243-0 BALL JOINT CONNECTOR
13 930103-0500 NUT
14 951703-0500 SNAP RETAINER d=5
15 3B7-71010-2 OIL TANK
16 3C8-71015-0 OIL FILLER CAP
17 3C8-71016-0 GASKET 36-52-2
18 3C8-71017-0 CAP HOOK
19 3C8-71018-0 OIL TANK CAP CHECK VALVE
20 3B7-71020-1 OIL LEVEL SENSOR
21 910103-0630 BOLT
22 346-67115-0 WASHER 6.5-21-1
23 941303-0600 SPRING WASHER
24 346-67113-0 MOUNT 8.5-14-2.5
25 3B7-06920-0 RUBBER MOUNT 8.5-14-2.5
26 346-67114-1 SPACER 6.2-9-15.7
27 3C7-71030-0 OIL FILTER ASSY
28 3B7-02237-0 * CUP
29 3B7-02235-0 * O-RING
30 3C7-71033-0 * FILTER
31 3B7-02236-0 * O-RING
32 3T5-02239-0 PLATE
33 910103-6614 BOLT
34 930103-0800 NUT
35 940103-0800 WASHER
36 99AA-6-0540 PIPE
37 99AA-6-0735 PIPE
38 3AB-35143-0 CLIP φ9.4
OPTIONAL PARTS (1) (33 parts) OPTIONAL PARTS (1)
Ref OEM Part # Part Name
1 3E0-72649-0 SPEEDOMETER ASSY (75MPH)
2 3B7-72659-0 * METER BULB 12V-1.8W
3 3B7-72656-0 * METER DAMPER
4 3B7-72661-0 * FITTING PLATE
7 3B7-72650-0 * SPEEDOMETER TUBE L=6000
8 3B7-72651-0 * SPEEDOMETER BAND
9 3E0-72526-0 WATER TEMPERATURE METER KIT
10 3E0-72597-0 * WATER TEMPERATURE METER ASSY
16 3B7-72514-0 * WATER TEMPERATURE SENSOR
17 3B7-72518-0 * LEAD WIRE L=7700
18 3E0-72529-0 VOLTMETER ASSY
21 3B7-72662-0 * FITTING PLATE
24 3E0-72527-0 WATER PRESSURE METER KIT
25 3E0-72598-0 * WATER PRESSURE METER ASSY
28 3B7-72663-0 ** FITTING PLATE
29 930203-0500 ** NUT
30 941303-0500 ** SPRING WASHER
31 3B7-72641-0 * WATER PRESSURE METER NIPPLE
32 98AB-506000 * HOSE
33 338-02215-0 * CLIP φ10
34 345-67193-0 * GROMMET 16-2.5
35 394-70013-0 * PIPE JOINT 4-4
36 121-33159-0 * GASKET 2-8-1
37 3E0-72524-0 HOUR METER ASSY
38 3B7-72657-0 * METER BULB 12V-1.7W
39 3B7-72655-0 * METER DAMPER
40 3B7-72664-0 * FITTING PLATE
41 930203-0400 * NUT
42 941303-0400 * SPRING WASHER
43 353-72521-1 METER LAMP SWITCH
44 353-72548-0 ASSIST CORD (BLK) L=200
45 3A3-76114-0 EXTENSION CORD L=2000
46 3Z4-72573-0 EXTENSION CORD (TRIM SENSOR) L=2000
OPTIONAL PARTS (2) (20 parts) OPTIONAL PARTS (2)
Ref OEM Part # Part Name
1 3A3-81301-0 TWIN REMOTE CONTROL KIT
2 353-84904-0 DRAG LINK SPACER
3 3B7-84490-3 CONTROL HEAD ASSY (TOP-SINGLE)
4 3B7-84540-3 CONTROL HEAD ASSY (TOP-TWIN)
5 3C7-84480-1 * REMOTE CONT HEAD (TOP-SINGLE)
6 3C7-84520-1 * REMOTE CONT HEAD (TOP-TWIN)
7 3Z5-84462-0 ** DECAL (TOHATSU)
8 353-76020-3 * MAIN SWITCH ASSY
9 805-76201-1 * MAIN SWITCH PANEL
10 921146-4516 * SCREW
11 3A3-06830-0 * STOP SWITCH ASSY
12 3A3-76115-1 * CORD ASSY L=6200
13 178-34147-0 * BAND 200
14 353-72546-0 * ASSIST CORD (RED) L=200
15 3C8-76171-0 * OVERHEAT BUZZER
16 3C7-84475-0 * PTT SWITCH CORD
17 3C7-84476-0 * PTT SWITCH CORD
18 3C7-84477-0 * PTT SWITCH CORD
19 3C7-84470-1 * NEUTRAL SWITCH CORD
20 3C7-84471-1 * NEUTRAL SWITCH CORD
PISTON・CRANK SHAFT (19 parts) PISTON・CRANK SHAFT
Ref OEM Part # Part Name
1 3B7-00050-1 CRANKSHAFT ASSY W/GEAR
2 9603-3-6208 * BALL BEARING 6208
3 3B7-00116-0 * SPACER 40-52-7
4 353-64038-0 * SHIM 36-44-0.1
6 3B7-09060-0 * OIL PUMP DRIVE GEAR
7 945107-3500 * C-RING d=35
8 3B7-00115-0 THRUST PLATE 66-85-2
9 3C7-00042-0 ROLLER BEARING 20-25-28
10 353-00046-0 SMALL END BEARING WASHER
11 353-00113-0 MAIN BEARING
12 353-00121-0 * OIL SEAL 36.5-46-8
13 353-00108-0 O-RING 2.4-44.7
14 3MR-87124-0 PISTON RING SET (0.5 O/S)
15 3B7-00014-0 * PISTON RING (0.5 O/S)
16 3B7-00015-0 * PISTON RING (0.5 O/S)
17 3MR-87131-0 PISTON REPAIR KIT (0.5 O/S)
18 3B7-00004-2 * PISTON (0.5 O/S)
19 360-00021-1 * PISTON PIN
20 353-00024-1 * PISTON PIN CLIP
POWER TRIM & TILT (PTT) (45 parts) POWER TRIM & TILT (PTT)
Ref OEM Part # Part Name
1 3E0-77180-2 MOTOR ASSY
2 3E0-77195-0 * YOKE ASSY
3 3E0-77190-0 * ARMATURE ASSY
4 353-77182-1 * O-RING
5 3E0-77192-0 * MOTOR BRACKET ASSY
6 3E0-77183-0 ** BRUSH
7 353-77191-0 ** BREAKER
8 3E0-77184-0 ** BRUSH SPRING
9 3E0-77199-1 BOLT
10 3E0-77430-1 PUMP
11 3E0-77434-0 * FILTER
12 3E0-77163-0 COUPLING
13 3B7-77167-0 O-RING 1.8-69.6
14 3E0-77176-1 MANUAL VALVE
15 3B7-77411-0 * O-RING
16 3E0-77407-0 * O-RING
17 3E0-77408-0 * BACK-UP RING
18 9450E3-1800 C-RING
19 3E0-77365-1 PISTON ROD ASSY
20 3E0-77383-0 * O-RING
22 3B7-77377-1 FREE PISTON
23 3B7-77375-0 O-RING
24 3B7-77376-0 BACK-UP RING
25 3E0-77388-0 TRIM PISTON ASSY
26 3B7-77392-0 * O-RING
27 3B7-77393-0 * BACK-UP RING
28 3E0-77395-0 ROD GUIDE SUB-ASSY
29 3E0-77398-0 * O-RING
30 3E0-77472-1 PLUG
31 3B7-77179-0 O-RING
32 3E0-77475-0 FILTER
33 3E0-77479-0 ORIFICE
34 3E0-77165-0 RESERVE TANK
35 3E0-77168-0 CAP
36 3E0-77169-0 O-RING
37 3E0-77159-1 BOLT
38 3E0-77431-1 BOLT
39 3E0-77432-1 BOLT
40 3E0-77167-0 O-RING
41 3E0-77557-0 ORIFICE
42 3E0-77558-0 BALL
43 3E0-77559-0 PIN
44 3B7-77169-0 O-RING
45 3E0-77453-0 VALVE SEAT
46 3E0-77456-0 FILTER
SHIFT (20 parts) SHIFT
Ref OEM Part # Part Name
1 3T9-66110-0 SHIFT ROD LEVER
2 930403-1000 NYLON NUT 10-P1.5
3 3B7-66225-0 SHIFT LEVER SHAFT
4 353-66145-1 HOLDER
5 3T1-60108-0 PRE-COATED BOLT 8-25
6 332-61315-0 WASHER 10.5-18-1.5
7 353-83728-1 PIN
8 930103-0600 NUT
9 941303-0600 SPRING WASHER
10 3B7-66150-3 SHIFT ASSIST ASSY
11 353-66215-1 SHIFT ROD (L)
14 3B7-66122-2 SHIFT ARM
15 910103-6835 BOLT
16 3B7-63713-0 BUSHING 12-14-15.5
17 3B7-63732-1 COLLAR 8.4-12-17
18 3B7-63730-0 WASHER 8.5-24-1.5
19 3B7-63731-0 WASHER 12.5-24-1
20 3B7-83715-2 CABLE JOINT
21 3AA-83719-0 WASHER 8.5-18-1.6
22 951603-0800 SNAP PIN d=8
THROTTLE (24 parts) THROTTLE
Ref OEM Part # Part Name
1 3B7B63711-3 ADVANCER ARM
3 3B7-05244-0 BALL JOINT
5 3B7-63716-1 THROTTLE ROD 5-120
6 3B7-63715-1 ROD 5-113
7 3B7-05243-0 BALL JOINT CONNECTOR
8 930103-0500 NUT
9 910103-6835 BOLT
10 3B7-63730-0 WASHER 8.5-24-1.5
11 3B7-63713-0 BUSHING 12-14-15.5
12 3B7-63731-0 WASHER 12.5-24-1
13 3B7-63732-1 COLLAR 8.4-12-17
14 3B7-63718-0 THROTTLE CAM
15 346-05228-1 BALL JOINT
16 941303-0600 SPRING WASHER
17 3B7-63721-0 COLLAR 8.4-12-26.3
18 3B7-63727-0 SPRING
19 3B7-63712-0 ADVANCER LEVER
20 3B7-63733-0 ROD SNAP 5-2.5
21 910103-0845 BOLT
22 940103-0800 WASHER
23 941303-0800 SPRING WASHER
24 3B7-83715-2 CABLE JOINT
25 3AA-83719-0 WASHER 8.5-18-1.6
26 951603-0800 SNAP PIN d=8
TOP COWL (27 parts) TOP COWL
Ref OEM Part # Part Name
1 3T1-72043-0 OIL CAUTION DECAL
2 3B7Q67645-2 TOP COWL ASSY
3 3MRQ67640-0 * TOP COWL SUB-ASSY
4 353-67501-0 ** TOP COWL SEAL L=1780
5 353-67517-1 ** LOCATING BRACKET
6 921703-5520 ** SCREW
7 9301F1-0500 ** NUT
8 941303-0500 ** SPRING WASHER
9 353Q67141-0 ** HOOK LEVER
10 353-67147-1 ** SEAL RING
11 353-67105-0 ** HOOK LEVER BUSHING 12-14-12
12 338-62435-0 ** O-RING 1.5-9.5
13 353-67142-1 ** COVER HOOK
14 910103-6616 ** BOLT
15 3C8-66308-0 ** WASHER 6-16-1.5
16 3B7Q67521-0 ** TILT HANDLE
17 910103-0616 ** BOLT
18 910103-0630 ** BOLT
19 3B7Q67210-0 ** FILLER LID
20 3B7-67211-0 ** FILLER LID HINGE
21 3B7-67212-0 ** SPRING
22 941303-0600 ** SPRING WASHER
23 910103-0614 ** BOLT
24 930103-0600 ** NUT
25 3B7-67213-0 ** SEAL
26 3C7-72180-3 * CAUTION DECAL (A)
27 3B7-87802-2 * DECAL SET (M90A/A2)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Tohatsu M90A2 running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.

  1. Replace water pump impeller and inspect wear plate
  2. Inspect and clean carburetor(s); check fuel mixture settings
  3. Replace spark plugs and check ignition timing
  4. Drain and refill lower unit gear oil; inspect for water contamination
  5. Inspect fuel lines, primer bulb, and fuel filter for deterioration
  6. Check and replace sacrificial anodes (zinc or aluminum)
  7. Inspect propeller for damage; check shaft seal and cotter pin
  8. Decarbonize exhaust ports and piston crown if needed
  9. Lubricate all grease points (steering, tilt tube, shift linkage)
  10. 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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