Tohatsu M4C/5B (2013) Parts & Diagrams

OEM and aftermarket replacement parts for Tohatsu M4C/5B. Scroll down for exploded parts diagrams (16), specifications, and maintenance reference.

Tohatsu M4C/5B (2013) Parts & Diagrams

🔎 Tohatsu M4C/5B Reference Library — Exploded parts diagrams (16 diagrams), specifications, common issues, and maintenance checklist.

The Tohatsu M4C/5B is a 2-Stroke outboard motor. Designed for dinghies, inflatable boats, and small tenders where lightweight portability is essential.

Quick Reference Specifications

Specification Value
Engine Type 2-Stroke
Horsepower 4 HP
Displacement 102
Bore x Stroke 55 x 43
Spark Plug (Type & Gap) NGK B8HS-10
Engine Oil Capacity
Recommended Engine Oil TC-W3 Certified 2-Stroke Oil
Gear Case Oil Capacity 195 mL (6.6 fl oz)
Idle Speed (in gear) 900–1,100 RPM (in gear)
Full Throttle RPM Range 4,500–5,500 RPM
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 M4C/5B:

  • 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 M4C/5B.

ASSEMBLY・KIT PARTS (8 parts) ASSEMBLY・KIT PARTS
Ref OEM Part # Part Name
1 369Q87304-2 LOWER UNIT ASSY (UL)
2 9401E3-0800 * WASHER
3 3F9B87090-4 ENGINE SHORT BLOCK KIT
4 922553-6423 * SCREW
5 369-87121-5 POWER HEAD GASKET SET
6 940103-0600 * WASHER
7 369-65239-0 * WATER PUMP GUIDE PLATE
8 369-87321-0 LOWER UNIT GASKET SET
BOTTOM COWL・TILLER HANDLE (57 parts) BOTTOM COWL・TILLER HANDLE
Ref OEM Part # Part Name
1 369Q67100-3 BOTTOM COWL
2 393Q67100-3 BOTTOM COWL
3 369Q67141-1 HOOK LEVER
4 3C8-67146-0 WASHER 14-22-1
5 338-67147-0 SEAL RING 13.8-22-3.7
6 369-67105-0 HOOK LEVER BUSHING
7 941403-1400 WAVE WASHER d=14
8 369-67142-0 COVER HOOK
9 910103-6612 BOLT
10 3C8-66308-0 WASHER 6-16-1.5
11 369-67188-0 GROMMET
12 369-67187-0 GROMMET
13 369Q63010-1 TILLER HANDLE ASSY
14 3B2Q63011-1 * TILLER HANDLE
15 3B2-63104-1 * STUD
16 369-63012-1 * GRIP
17 345-63048-0 * THROTTLE SHAFT DAMPER
18 350-63046-0 * BUSHING 8.4-10-11
19 920803-0518 * SCREW
20 3B2-63063-0 * THROTTLE SHAFT SUPPORT
21 9215E3-0612 * SCREW
22 3B2-63035-1 * FRICTION PIECE
23 3B2-63034-0 * ADJUSTING SCREW
24 940103-0600 * WASHER
26 3B2-63041-0 * THROTTLE SHAFT
27 369-72019-1 * THROTTLE DECAL
28 369-63600-1 THROTTLE WIRE
29 941303-0600 SPRING WASHER
30 369-63102-0 BUSHING
31 369-63103-1 STEERING HANDLE STOPPER
32 350-67154-0 PLASTIC RIVET 6.5
33 930103-0600 NUT
34 369-63508-0 THROTTLE WIRE BRACKET
35 910121-6612 BOLT
36 3D5-06870-0 STOP SWITCH ASSY
37 353-06821-0 * STOP SWITCH LANYARD ASSY
38 369-70263-0 BUSHING
39 941303-1000 SPRING WASHER
40 3B2-70260-1 FUEL CONNECTOR (MALE)
41 921503-0414 SCREW
42 930103-0400 NUT
43 98AB-50-200 HOSE
44 98AB-50-110 HOSE
45 338-02215-0 CLIP φ10
46 394-70311-0 FUEL COCK ASSY
47 921803-0410 SCREW
48 9101E3-5616 BOLT
49 369-67151-2 CHOKE ROD
50 393-67104-0 CHOKE ROD BUSHING
51 345-67117-0 GROMMET 17-2.7
52 369-72016-0 FUEL LEVEL DECAL
53 369-72026-0 SPARK PLUG DECAL (BPR7HS10)
54 369-70061-0 FUEL COCK ROD
55 369-70062-0 FUEL COCK KNOB
56 921503-6410 SCREW
57 369-70063-0 SEAL RING
58 353-72544-1 FUEL COCK ROD HOSE
BRACKET・REVERSE LOCK ARM (41 parts) BRACKET・REVERSE LOCK ARM
Ref OEM Part # Part Name
1 369Q62391-2 SWIVEL BRACKET
2 393Q62392-1 SWIVEL BRACKET
3 369Q62112-3 CLAMP BRACKET (R)
4 369Q62113-2 CLAMP BRACKET (L)
5 309-62115-2 BOLT 8-122
6 930403-0800 NYLON NUT 8-P1.25
7 9401E3-0800 WASHER
8 307-62116-1 WASHER 8.5-28-1
9 369-62118-0 DISTANCE PLATE
10 9216E3-0612 SCREW
11 369-62146-1 STERN BRACKET SPRING
12 921703-0406 SCREW
13 369-62147-0 WASHER 4.3-16-1.5
14 350-62121-2 THRUST ROD
15 369-62122-2 THRUST ROD SPRING
16 9101E3-5635 BOLT
17 369-62422-0 THRUST PLATE (UPPER)
18 393-62416-1 BUSHING
19 393-62417-1 BUSHING
20 369-62441-1 FRICTION PIECE
21 309-62446-1 SPRING
22 309Q62442-2 FRICTION KNOB
23 9401E3-0600 WASHER
24 3AS-62431-0 TILT STOPPER ASSY
25 3AS-62433-0 * TILT STOPPER GRIP
26 393-62437-1 BUSHING
27 369-62439-1 SETTING PLATE
28 9101E3-5612 BOLT
29 369-62434-0 SPRING
30 344-67177-1 GREASE FITTING
31 369-66313-0 REVERSE LOCK ARM
32 9101E3-5614 BOLT
33 369-66338-0 REVERSE LOCK SPRING (R)
34 369-66339-0 REVERSE LOCK SPRING (L)
35 3GTQ62105-1 CLAMP SCREW KIT
36 3GTQ62108-1 * CLAMP SCREW ASSY
37 369-62106-1 ** CLAMP SCREW
38 3ABQ62102-0 ** CLAMP SCREW HANDLE
39 3C8-62104-2 ** RIVET 3-22
40 332-62101-1 * CLAMP SCREW PAD
41 3C8-62107-0 * SHOULDER BOLT
CARBURETOR (41 parts) CARBURETOR
Ref OEM Part # Part Name
1 393-03200-2 CARBURETOR ASSY
2 369-03252-1 * MAIN NOZZLE
3 369-03251-0 * MAIN JET (#78)
4 393-03254-0 * SLOW JET (#52)
5 346-03256-0 * RUBBER CAP
6 369-03231-0 * FLOAT
7 369-03240-0 * FLOAT VALVE
8 344-03244-0 * CLIP
9 346-03232-0 * FLOAT ARM PIN
10 921521-0408 * SCREW
11 369-03221-0 * FLOAT CHAMBER
12 369-03222-0 * FLOAT CHAMBER O-RING
13 922503-6412 * SCREW
14 369-03292-0 * DRAIN SCREW
15 369-03293-1 * GASKET
16 346-03265-0 * STOP SCREW
17 346-03267-0 * SPRING
18 3B2-03266-0 * PILOT SCREW
19 356-03268-0 * SPRING
20 369-03304-0 * PUMP BODY
21 369-03305-0 * CHECK VALVE
22 921821-0306 * SCREW
23 930121-0300 * NUT
24 369-03301-0 * PUMP COVER
25 922553-6423 * SCREW
26 369-03302-0 * PUMP COVER GASKET
27 369-03303-0 * DIAPHRAGM A
28 369-03306-0 * DIAPHRAGM B
29 369-03307-0 * PUMP BODY GASKET
30 369-03181-0 * CARBURETOR COVER
31 369-03182-0 * CARBURETOR COVER GASKET
32 369-03183-0 * CARBURETOR COVER GASKET
33 369-03186-0 * SCREW
34 369-02011-0 CARBURETOR GASKET
35 9161F1-0685 BOLT
36 941322-0600 SPRING WASHER
37 393-67192-0 CHOKE ROD
38 346-67196-1 ROD SNAP 3-B
39 369-02501-2 PLATE
40 369-02503-1 HOLDER
41 921503-5418 SCREW
CYLINDER・CRANK CASE (18 parts) CYLINDER・CRANK CASE
Ref OEM Part # Part Name
1 369B01100-2 CYL BLOCK & CRANKCASE ASSY
2 345-01111-0 * DOWEL PIN 6-12
3 916124-0653 * BOLT
4 916124-0630 * BOLT
5 941322-0600 * SPRING WASHER
6 369B01001-1 CYLINDER HEAD
7 369-01005-2 CYLINDER HEAD GASKET
8 9161F4-0835 BOLT
9 940124-0800 WASHER
10 369-02111-0 REED VALVE
11 393-02113-0 REED VALVE STOPPER
12 921521-6410 SCREW
13 369-01210-4 CRANKCASE HEAD
14 369-01215-0 OIL SEAL 10.1-25-7
15 369-01217-0 SPACER 19-24.8-1
16 369-01214-0 CRANKCASE HEAD GASKET
17 910103-6620 BOLT
18 9701-1-1014 SPARK PLUG (BPR7HS10)
DRIVE SHAFT HOUSING・SHIFT (33 parts) DRIVE SHAFT HOUSING・SHIFT
Ref OEM Part # Part Name
1 369Q61030-5 DRIVE SHAFT HOUSING ASSY (L)
2 301-61021-0 * BUSHING
3 369-64331-2 DRIVE SHAFT BUSHING ASSY
4 369-60003-0 * DRIVE SHAFT BUSHING
5 369-64332-1 STOPPER
6 3H6-64333-1 PRE-COATED SCREW 5-25
7 9401E3-0500 WASHER
8 921553-0510 SCREW
9 345-01111-0 DOWEL PIN 6-12
10 9106E3-0808 BOLT
11 332-60006-0 GASKET 8.1-15-1
12 369-66043-1 GROMMET
13 369-66241-0 SHIFT ROD JOINT ASSY
14 910103-5616 BOLT
15 369-66110-4 SHIFT LEVER
16 301-66136-0 O-RING 1.9-8.8
17 369-66116-0 CERAMIC BALL 7.7
18 369-66112-1 SPRING
19 369-66215-0 SHIFT ROD (L)
21 369-66225-0 SHIFT ROD LEVER
22 910903-6416 BOLT
23 369-66223-0 PIN
24 951503-1210 SPLIT PIN
25 9101E3-5630 BOLT
26 369-61012-2 DRIVE SHAFT HOUSING GASKET
27 369-61016-0 GROMMET 29-3
28 369-61097-0 WATER OUTLET HOSE
29 369Q61110-2 EXTENSION HOUSING
30 9161E3-0625 BOLT
31 9401E3-0600 WASHER
32 9152E3-0825 STUD
33 9401E3-0800 WASHER
34 930103-0800 NUT
GEAR CASE (63 parts) GEAR CASE
Ref OEM Part # Part Name
1 369Q60000-3 GEAR CASE ASSY
2 369-60211-0 * ROLLER BEARING 14-20-12
3 332-60005-2 PLUG 8-8
4 332-60006-0 GASKET 8.1-15-1
5 3H6-60218-0 ANODE
6 910103-0616 BOLT
7 9601-0-6004 BALL BEARING 6004
8 369Q87323-1 PROPELLER SHAFT HOUSING ASSY
9 369Q60101-1 * PROPELLER SHAFT HOUSING
10 369-60111-0 * OIL SEAL 15-28-10
11 345-65015-0 * O-RING 3.2-47
12 9601-0-6002 * BALL BEARING 6002
13 369-64010-2 BEVEL GEAR ASSY (A)
14 369-64020-2 BEVEL GEAR B
15 369-64030-2 BEVEL GEAR ASSY (C)
16 369-64032-0 WASHER 15.2-19-1.9
17 369-64015-0 SHIM 21-28-0.15
18 369-64211-1 PROPELLER SHAFT
19 301-64215-1 CLUTCH
20 301-64217-0 PIN 3.5-28
21 393-64221-0 SPRING
22 369-64222-0 SPRING RETAINER
23 369-64223-0 PUSH ROD
24 369-60206-0 WATER STRAINER
25 921803-0620 SCREW
26 369-65035-0 WATER PIPE (LOWER)
27 369-65036-0 SEAL
28 369-65021-1 WATER PUMP IMPELLER
29 369-65022-0 KEY φ2-11
30 369-65016-0 PUMP CASE (UPPER)
31 369-65011-0 PUMP CASE LINER
32 369-65025-0 WATER PUMP GUIDE PLATE
33 369-65018-0 PUMP CASE GASKET
34 369-65029-0 GUIDE PLATE GASKET
36 940103-0600 WASHER
37 369-65017-1 PUMP CASE (LOWER)
38 369-60223-0 OIL SEAL 10-24-8
39 369-64082-1 SHIM 26.5-34.8-0.15
40 369-65020-0 PUMP CASE GASKET (LOWER)
41 910103-5625 BOLT
42 369-65014-0 WATER PIPE SEAL (LOWER)
43 369-64303-0 DRIVE SHAFT ASSY (UL)
44 9601-0-6300 * BALL BEARING 6300
45 369-66014-2 CAM ROD (UL)
46 369-66011-0 CLUTCH CAM
47 951407-0310 SPRING PIN 3-10
48 369-66031-0 CAM ROD BUSHING
49 369-66021-1 O-RING 2.5-4.9
50 332-66032-0 O-RING 2.4-15.4
51 369-66033-0 STOPPER
52 9101E3-5616 BOLT
53 9161E3-0645 BOLT
54 9401E3-0600 WASHER
55 9161E3-0835 BOLT
56 9401E3-0800 WASHER
57 369-65120-0 WATER PIPE ASSY (UL)
58 369-65195-0 * GROMMET
59 3R1B64516-1 PROPELLER ASSY (8")
60 3H6-87326-0 PROPELLER HARDWARE KIT
61 3AS-64230-0 * THRUST HOLDER ASSY
62 369-64124-0 * WASHER 10.5-28-2
63 369-64121-0 * PROPELLER NUT
64 951503-0318 * SPLIT PIN 3-18
INTEGRAL FUEL TANK(M5B-D・M5B・M4C) (15 parts) INTEGRAL FUEL TANK(M5B-D・M5B・M4C)
Ref OEM Part # Part Name
1 393-70020-6 FUEL TANK CAP ASSY
2 3D6-70021-0 * TANK FILLER CAP GASKET
3 369-70036-2 FUEL TANK SEAL
4 369-70316-4 FUEL TANK
5 941303-0600 SPRING WASHER
6 930103-0600 NUT
7 3C8-66308-0 WASHER 6-16-1.5
8 345-05122-1 WASHER 6.5-23-1.5
9 3F9-70057-0 FUEL TANK MOUNT
10 369-70312-1 FUEL TANK STAY
11 9101F4-0616 BOLT
12 940103-0600 WASHER
13 369-70311-0 FUEL COCK ASSY
14 369-70315-0 FUEL HOSE
15 338-02215-0 CLIP φ10
MAGNETO (19 parts) MAGNETO
Ref OEM Part # Part Name
1 369-06001-1 FLYWHEEL
2 369-06021-0 EXCITER COIL
3 921521-6520 SCREW
4 369-06915-0 CLAMP 4.2-3-8
5 921521-6408 SCREW
6 369-06060-1 CD UNIT
7 3H6-06907-0 RUBBER DAMPER
8 3H6-06906-0 RUBBER DAMPER
9 3F9-06050-0 IGNITION COIL W/CAP
10 3M2-06921-0 * PLUG CAP
11 3M2-06926-0 * PLUG CAP TERMINAL
12 3C7-06921-0 PLUG CAP W/RESISTANCE
13 910121-7622 BOLT
14 369-06071-0 PULSAR COIL
15 921521-6412 SCREW
16 369-06908-0 GROMMET φ11
17 369-00132-0 NUT 12-P1.25
18 940121-1200 WASHER
19 951503-0318 SPLIT PIN 3-18
OPTIONAL PARTS (1) ACCESSORIES (REMOTE CONTROL) (29 parts) OPTIONAL PARTS (1) ACCESSORIES (REMOTE CONTROL)
Ref OEM Part # Part Name
1 369-83880-2 REMOTE CONTROL FITTING ASSY
2 3A1-83722-0 * BALL JOINT HOLDER
3 332-83723-0 * HOLDER CAP
4 332-83724-0 * SPRING
5 332-83725-0 * WASHER 5.5-14-1.2
6 369-83820-0 * CABLE CLIP ASSY
7 910103-6616 * BOLT
8 930103-0600 * NUT
9 369-83830-2 * STEERING HOOK PLATE
10 910103-0830 * BOLT
11 941303-0800 * SPRING WASHER
12 940103-0800 * WASHER
13 930103-0800 * NUT
14 369-83726-0 * THROTTLE LEVER
15 369-67105-0 * HOOK LEVER BUSHING
16 338-67147-0 * SEAL RING 13.8-22-3.7
17 941403-1400 * WAVE WASHER d=14
18 369-83887-0 * THROTTLE LEVER
19 910103-6612 * BOLT
20 369-83888-0 * COLLAR 13.5-18-2.5
21 3C8-66308-0 * WASHER 6-16-1.5
22 369-83863-0 * THROTTLE WIRE (REMOTE CONTROL)
23 332-83728-0 * PIN
24 332-83729-0 * SPRING
25 951403-0212 * SPRING PIN 2-12
26 369-83715-1 * CABLE JOINT
27 369-83883-0 * SEPARATE CORD
28 369-83858-0 REMOTE CONTROL STOP CORD L=5900
29 345-66226-0 GROMMET 17-3
OPTIONAL PARTS (2) REMOTE CONTROL BOX (55 parts) OPTIONAL PARTS (2) REMOTE CONTROL BOX
Ref OEM Part # Part Name
1 3B7Q84360-1 REMOTE CONTROL HEAD ASSY (RC5D)
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 945303-0600 * E-RING d=6
25 3A3-84381-0 * SHIFT GEAR ASSY
26 3A3-83314-2 * CABLE TERMINAL
27 3A3-84364-2 * DRIVE GEAR
28 3A3-84429-0 * WIRE COVER
29 930103-0500 * NUT
30 910103-0525 * BOLT
31 3A3-84376-0 * GROMMET
32 398-06830-0 * STOP SWITCH ASSY
33 353-06821-0 ** STOP SWITCH LANYARD ASSY
34 3B7Q84441-0 * REAR HOUSING
35 3B7Q84366-0 * REAR PANEL
36 3A3-84401-0 * NEUTRAL LOCK ARM
37 3A3-84403-0 * NEUTRAL LOCK SPRING
38 3A3-84407-0 * WASHER
39 921503-0510 * SCREW
40 3A3-84451-0 * TILT SWITCH COVER
41 3A3-84404-0 * GRIP
42 3B7Q84343-0 * CONTROL LEVER
43 3A3-84452-0 * TILT SWITCH PLUG
44 3A3-84368-0 * WAVE WASHER
45 3A3-84391-0 * FREE THROTTLE DRUM
46 3A3-84435-0 * BUSHING
47 3A3-84406-0 * PLATE
48 3N5-84336-0 * SHIFT POSITION DECAL
49 3N5-84465-0 * SHIFT POSITION SIDE DECAL
50 3N5-84331-0 * DECAL (LEVER)
51 3N5-84333-0 * DECAL (TOHATSU)
52 361-84414-0 * GROMMET
53 369-84418-0 * GROMMET
54 353-84321-0 * GROMMET
55 369-84416-0 * GROMMET
OPTIONAL PARTS (3) ACCESSORIES (24 parts) OPTIONAL PARTS (3) ACCESSORIES
Ref OEM Part # Part Name
1 369-72100-0 TOOL KIT
2 312-72201-0 SAFETY ROPE φ4-1000
3 399-76101-0 LIGHTING KIT
4 3H6-06128-0 * ALTERNATOR KIT
5 399-06023-1 ** ALTERNATOR ASSY (60W)
6 921521-6520 ** SCREW
7 369-06915-0 ** CLAMP 4.2-3-8
8 921521-6408 ** SCREW
9 369-76167-0 * EXTENSION CORD (LIGHT) L=2000
10 345-66226-0 * GROMMET 17-3
11 3H6-76160-0 * RECTIFIER KIT
12 369-76060-1 ** RECTIFIER COMPLETE
13 334-76211-0 *** FUSE 10A
14 921503-0525 ** SCREW
15 940103-0500 ** WASHER
16 941303-0500 ** SPRING WASHER
17 930103-0500 ** NUT
18 353-06972-0 ** CLAMP 7-80P
19 369-76161-0 ** EXTENSION CORD
20 399B05180-0 VERTICAL STARTER KIT
21 369B05911-0 * VERTICAL STARTER GUIDE
22 369-05913-0 * TAPPING SCREW
23 3B2-05912-0 * SEAL
24 336-60007-0 FLUSHING PLUG
PISTON・CRANK SHAFT (17 parts) PISTON・CRANK SHAFT
Ref OEM Part # Part Name
1 369-00115-0 THRUST PLATE
2 369-00122-0 OIL SEAL 20-47-8
3 350-00042-0 ROLLER BEARING 14-18-20
4 369-00069-0 CRANKSHAFT SUB-ASSY
5 369-00031-0 * CRANKSHAFT A
6 369-00034-0 * CRANKSHAFT D
7 369-00061-1 * CRANK PIN
8 369-00043-0 * ROLLER BEARING 20-26-12
9 369-00040-0 * CONNECTING ROD
10 9603-3-6204 BALL BEARING 6204
11 338-00131-0 KEY
12 369-87131-0 PISTON REPAIR KIT (0.5 O/S)
13 369-00004-1 * PISTON (0.5 O/S)
14 369-00021-1 * PISTON PIN
15 350-00024-1 * PISTON PIN CLIP
16 369-87124-0 PISTON RING SET (0.5 O/S)
17 351-00014-0 * PISTON RING (0.5 O/S)
RECOIL STARTER・STARTER LOCK (32 parts) RECOIL STARTER・STARTER LOCK
Ref OEM Part # Part Name
1 3AS-05090-1 RECOIL STARTER ASSY
2 3R1-05105-0 * STARTER CASE
3 3R1-05010-0 * STARTER SPRING SET
4 3R1-05125-0 ** STARTER SPRING CASE
5 3R1-05004-0 ** STARTER SPRING
6 3R1-05104-0 * REEL
7 3R1-05012-0 * RETURN SPRING
8 3R1-05003-2 * RATCHET
9 3R1-05007-0 * FRICTION SPRING
10 3R1-05138-1 * BOLT
11 3R1-05006-2 * FRICTION PLATE
12 3R1-05013-0 * STARTER ROPE φ4.5-1620
13 3R1-05019-0 * STARTER HANDLE
14 3R1-05131-1 * ROPE ANCHOR
15 3R1-05116-0 * SEALING PLATE
16 3R1-05252-0 * STARTER LOCK
17 3R1-05255-0 * COLLAR 4-6-21
18 3R1-05216-0 * STARTER LOCK SPRING
19 3R1-05253-0 * STARTER LOCK CAM
20 940103-0600 * WASHER
21 921503-7616 * SCREW
22 3R1-05223-0 * ROD SNAP 3.5-2
23 3R1-05215-0 * COLLAR 6.1-8-6.5
24 3R1-05258-0 * STARTER LOCK CAM SPRING
25 921503-5430 * SCREW
26 3R1-05901-0 STARTER PULLEY
27 369-05217-1 STARTER LOCK ROD
28 9101F4-0623 BOLT
29 941303-0600 SPRING WASHER
30 910121-6612 BOLT
31 345-05223-1 ROD SNAP 3.5-2
32 3R0-72181-0 CAUTION DECAL (B)
SEPARATE FUEL TANK・DUAL FUEL (M5B-D・M5B-S) (26 parts) SEPARATE FUEL TANK・DUAL FUEL (M5B-D・M5B-S)
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 3B2-70167-1 FUEL TANK ASSY 12L
13 3B2-70050-1 * FUEL GAUGE VENT CAP ASSY (12L)
14 3B2-70155-0 * PICK-UP ELBOW ASSY (12L)
15 3E0-70270-0 * QUICK-CONNECTOR (MALE)
16 3C7-70199-0 * O-RING
17 3C7-70113-0 * FILTER
18 98AB-50-150 HOSE
20 369-02230-0 FUEL FILTER ASSY
21 394-70315-0 FUEL HOSE
23 98AB-50-035 HOSE
24 394-70013-0 PIPE JOINT 4-4
25 394-70325-0 FUEL HOSE
26 338-02215-0 CLIP φ10
27 3F9-84398-0 BAND 205
28 394-70327-0 NON-RETURN VALVE
TOP COWL (8 parts) TOP COWL
Ref OEM Part # Part Name
1 3C7-72180-3 CAUTION DECAL (A)
2 369Q67560-5 TOP COWL ASSY
3 369Q67645-1 TOP COWL ASSY
3a 3X3Q67640-0 * TOP COWL SUB-ASSY
3b 369Q67640-1 * TOP COWL SUB-ASSY
4 394-67501-0 ** TOP COWL SEAL
5 3B2-67503-0 ** STARTER SEAL
6 3F9-87801-2 * DECAL SET (M4C)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Tohatsu M4C/5B 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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