Tohatsu MFS6CZ/8C/9.8C/9.9CY (2025) Parts & Diagrams

OEM and aftermarket replacement parts for Tohatsu MFS6CZ/8C/9.8C/9.9CY. Scroll down for exploded parts diagrams (22), specifications, and maintenance reference.

Tohatsu MFS6CZ/8C/9.8C/9.9CY (2025) Parts & Diagrams

🔎 Tohatsu MFS6CZ/8C/9.8C/9.9CY Reference Library — Exploded parts diagrams (22 diagrams), specifications, common issues, and maintenance checklist.

The Tohatsu MFS6CZ/8C/9.8C/9.9CY is a 4-Stroke Single Cylinder outboard motor. Designed for dinghies, inflatable boats, and small tenders where lightweight portability is essential.

Quick Reference Specifications

Specification Value
Engine Type 4-Stroke Single Cylinder
Horsepower 6 HP
Displacement 123 cc
Bore x Stroke 59.0 x 45.0 mm
Spark Plug (Type & Gap) NGK DCPR6E
Engine Oil Capacity 0.45 L
Recommended Engine Oil SAE 10W-30
Gear Case Oil Capacity 0.195 L
Idle Speed (in gear)
Full Throttle RPM Range 5000-6000 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 MFS6CZ/8C/9.8C/9.9CY:

  • 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 Tohatsu MFS6CZ/8C/9.8C/9.9CY.

Fig.01 CYLINDER・CRANK CASE (25 parts) Fig.01 CYLINDER・CRANK CASE
Ref OEM Part # Part Name
1 31HB01100-0 CYL BLOCK & CRANKCASE ASSY
2 31H-02093-0 * NIPPLE 10-11.5-32
3 345-01111-0 * DOWEL PIN 6-12
4 31H-01114-0 * BOLT M8-50-P1.25
5 3NV-01030-0 THERMOSTAT
5a 3AA-01030-0 THERMOSTAT
6 3H6B01031-0 THERMOSTAT CAP
7 346-01032-0 THERMOSTAT CAP GASKET
8 9101E3-5640 BOLT
9 31HB02301-0 EXHAUST COVER (OUTER)
10 31H-02305-0 EXHAUST COVER GASKET
11 9101E3-5625 BOLT
12 3KM-01142-0 ANODE PLUG ASSY
13 3P0-01143-0 * ANODE PLUG
14 3T5-10046-0 * O-RING 1.9-13
15 3P0-60218-0 * ANODE
16 921503-0530 * SCREW
17 3V2-07620-0 PLUNGER ASSY
18 31H-07710-0 OIL STRAINER ASSY
19 3UA-07715-0 PIPE L=120
20 369-84398-1 BAND 202
22 31H-07721-0 OIL LEVEL GAUGE
23 31H-07720-0 OIL LEVEL GAUGE GUIDE
24 3T5-10162-0 O-RING 1.9-9.8
25 910103-5612 BOLT
Fig.02 PISTON・CRANK SHAFT (20 parts) Fig.02 PISTON・CRANK SHAFT
Ref OEM Part # Part Name
1 3V1-00040-1 CONNECTING ROD ASSY
2 3H6-00059-0 * CONNECTING ROD BOLT
3 31H-00030-0 CRANKSHAFT ASSY
4 3V1-07408-0 PLAIN SHAFT BEARING 30-33-15
5 3BJ-00121-0 OIL SEAL 36-50-7
6 3V1-00121-0 OIL SEAL 30-45-8
7 3V1-00001-1 PISTON
8 3V1-00011-0 PISTON RING
9 3V1-00012-0 PISTON RING
10 3V1-00013-0 PISTON RING-OIL
13 3FK-87130-0 PISTON REPAIR KIT
14 3FK-87131-0 PISTON REPAIR KIT (0.5 O/S)
15 3V1-00004-1 * PISTON (0.5 O/S)
16 332-00021-1 * PISTON PIN
17 350-00024-1 * PISTON PIN CLIP
18 3FK-87123-0 PISTON RING SET
19 3FK-87124-0 PISTON RING SET (0.5 O/S)
20 3V1-00014-0 * PISTON RING (0.5 O/S)
21 3V1-00015-0 * PISTON RING (0.5 O/S)
22 3V1-00016-0 * PISTON RING-OIL (0.5 O/S)
Fig.03 CYLINDER HEAD・OIL PUMP (35 parts) Fig.03 CYLINDER HEAD・OIL PUMP
Ref OEM Part # Part Name
1 31PB01000-0 CYLINDER HEAD COMPLETE
2 31HB01001-0 * CYLINDER HEAD ASSY
3 3V1-07201-0 * INTAKE VALVE
4 3V1-07202-0 * EXHAUST VALVE
5 3AA-07203-0 * VALVE SPRING L=38.3
6 3GT-07921-0 * RETAINER
7 3KY-07923-0 * COTTER
8 3V1-07205-0 * VALVE SPRING SEAT
9 3R3-07204-0 * INTAKE VALVE STEM SEAL
10 3R3-07206-0 * EXHAUST VALVE STEM SEAL
11 3H8-07025-0 * OIL SEAL 18-35-8
12 31P-07810-0 * CAMSHAFT ASSY
13 3VS-07935-0 * ROCKER ARM
14 3R0-07238-0 * ADJUSTING SCREW
15 3H8-07237-0 * ADJUSTING NUT
16 3RS-07920-0 * ROCKER ARM SHAFT
17 3AA-07225-0 * ROCKER SHAFT SPRING L=25
18 3R3-07227-0 * WASHER 13.2-21.7-2
19 3V1-07600-0 * OIL PUMP ASSY
20 31H-07653-0 * OIL PUMP GASKET
21 910103-5635 * BOLT
22 31H-01005-0 CYLINDER HEAD GASKET
23 345-01111-0 DOWEL PIN 6-12
24 31N-01012-0 CYLINDER HEAD BOLT 8-1.25-50-12.9
25 940221-0800 WASHER
26 3KK-02319-0 BOLT 6-1.0-25-A2-70
27 940103-0600 WASHER
28 31HB01020-0 CYLINDER HEAD COVER ASSY
29 31H-07731-0 * BREATHER CHAMBER COVER
30 921521-0408 * SCREW
31 3V1-01024-0 CYLINDER HEAD COVER GASKET
32 910103-5625 BOLT
33 3R0-71015-1 OIL FILLER CAP
34 3R0-07422-0 O-RING 3.1-24.4
35 9701-1-1103 SPARK PLUG (DCPR6E)
Fig.04 PULLEY・TIMING BELT (8 parts) Fig.04 PULLEY・TIMING BELT
Ref OEM Part # Part Name
1 3VS-10060-0 DRIVE PULLEY
3 309-00131-0 KEY 10-3.7-3
4 31H-10063-0 BELT GUIDE 30-52-1
5 3T5-10068-2 NUT
6 3VS-10062-0 DRIVEN PULLEY
7 3H8-10066-0 WASHER 6.5-19-3.2
8 3AA-60108-0 PRE-COATED BOLT
9 31H-10045-0 TIMING BELT
Fig.05 INTAKE MANIFOLD・FUEL PUMP (96 parts) Fig.05 INTAKE MANIFOLD・FUEL PUMP
Ref OEM Part # Part Name
1 31H-10200-0 FUEL RAIL ASSY
2 31H-10201-0 * FUEL RAIL
3 3VS-10300-0 * FUEL INJECTOR ASSY
4 3VS-10323-0 * SEAL RING Φ8.5-5.5
5 3T5-10098-1 * VALVE ASSY (PRESSURE CHECK)
6 3T5-10099-0 * CAP
7 31H-01615-0 * NIPPLE 6-8-R1/8
8 910103-5625 BOLT
9 3RS-03952-0 INSULATOR
10 3KY-84398-0 BAND
11 31H-10150-0 VAPOR SEPARATOR ASSY
12 31H-10179-0 * COVER
13 31H-10180-0 * SEAL
15 3RS-03292-0 * DRAIN SCREW
16 3RS-04116-0 * GASKET
17 3RS-03239-0 * FLOAT VALVE ASSY
18 3RS-03232-0 * FLOAT ARM PIN
19 3RS-03230-0 * FLOAT
20 3RS-04314-0 * GROMMET
21 3RS-04322-0 * FILTER (INLET)
22 3RS-10157-0 * HOLDER
23 3RS-04302-0 * FUEL FEED PUMP
24 3RS-03116-0 * O-RING
25 3RT-03116-0 * O-RING
26 3RS-10095-0 * O-RING
27 3RS-10154-0 * FUEL REGULATOR
28 921503-0408 * SCREW
29 3RS-10172-0 * VST CONNECTOR
30 3RS-03244-0 * CLIP
32 3KY-06920-0 RUBBER MOUNT
33 3RS-76079-0 COLLAR 6.1-16-12.2
35 910103-0625 BOLT
36 31H-02168-0 FUEL HOSE W/PROTECTOR
37 3AC-10087-0 CLAMP φ16.8
38 98AB-50-190 HOSE
39 31H-65212-0 WATER HOSE 5-10-450-30
42 3H6-07422-0 O-RING
43 921503-5625 SCREW
44 98AB-50-415 HOSE
47 98AB-50-230 HOSE
48 3RS-02230-0 FUEL FILTER ASSY
49 3RS-02237-0 * CUP
50 3B7-02234-0 * FILTER
51 3B7-02236-0 * O-RING
52 3RS-02235-0 * O-RING
53 3RS-02253-0 * DRAIN VALVE
54 3RS-02258-0 * SEAL
55 3RS-02229-0 * FLOAT
56 31H-02232-0 FUEL FILTER HOLDER
57 31H-02228-0 FUEL FILTER BRACKET
59 31H-10185-0 VENT HOSE W/PROTECTOR
60 31N-02203-0 FUEL HOSE 4-8-400-30.5
61 31H-10211-0 ISC VALVE
62 31H-02107-0 ISC VALVE STAY
63 930103-0600 NUT
64 3B7-06305-0 RUBBER MOUNT 9-16-4.3
65 3A0-76079-0 COLLAR 6.2-9-7.4
66 3F3-06920-0 RUBBER MOUNT 8.5-12-2
67 31H-10212-0 HOSE 5.5-10.5-140-50
68 31N-10212-0 HOSE 5.5-10.5-205-30
69 31H-10100-0 THROTTLE BODY ASSY
70 3RS-10214-0 * MAP SENSOR
71 921503-0516 * SCREW
72 910103-5616 BOLT
73 31H-10104-0 GASKET
74 31H-02409-0 INTAKE SILENCER ASSY
75 31H-02410-0 * INTAKE SILENCER SUB-ASSY
76 31N-02410-0 * INTAKE SILENCER SUB-ASSY
77 31N-02418-0 * GASKET
78 3SS-06437-0 * TAPPING SCREW M5-16
79 910103-5620 BOLT
80 31H-02418-0 GASKET
81 3SY-76079-0 COLLAR
82 3C8-66308-0 WASHER 6-16-1.5
83 910103-0630 BOLT
84 31H-63617-0 THROTTLE ROD
85 31H-07735-0 BREATHER HOSE 7-12-320-49
86 31S-04080-0 FUEL HOSE W/PROTECTOR
87 31N-03536-0 RESTRICTOR
88 3T1-01138-0 NIPPLE 6-8-11
89 98AB-50-160 HOSE
90 3GT-35143-0 CLIP φ9.4
91 345-06915-0 CLAMP 6.5-14L
92 9101E3-5616 BOLT
93 31H-63622-0 THROTTLE DRUM ASSY
94 31H-63508-0 THROTTLE WIRE BRACKET
95 910103-5612 BOLT
96 3VS-84398-0 BAND
97 9301E3-0600 NUT
98 3AA-04000-2 FUEL PUMP ASSY
99 3H6-04044-0 * CHECK VALVE
100 3H6-04014-1 * CHECK VALVE
101 3H6-04028-0 * PUMP BODY GASKET
102 3H6-04005-0 * PUMP DIAPHRAGM
103 921603-0308 * SCREW
104 922503-6418 * SCREW
Fig.06 RECOIL STARTER (35 parts) Fig.06 RECOIL STARTER
Ref OEM Part # Part Name
1 31H-05090-0 RECOIL STARTER ASSY
3 3V1-05259-0 * WAVE WASHER 35.5-66-0.2
4 3AA-05004-0 * STARTER SPRING
5 3R1-05125-0 * STARTER SPRING CASE
6 3V1-05104-1 * REEL φ140
7 3R1-05012-0 * RETURN SPRING
8 3R1-05003-2 * RATCHET
9 3R1-05007-0 * FRICTION SPRING
10 3R1-05138-1 * BOLT 5-10-6.8-7.8
11 3R1-05006-2 * FRICTION PLATE
12 3AA-05013-0 * STARTER ROPE φ4.5-1600
13 31H-05019-0 * STARTER HANDLE
14 3R1-05131-1 * ROPE ANCHOR
15 3UA-67503-0 * STARTER SEAL
16 3AA-05252-0 * STARTER LOCK
17 921503-5430 * SCREW
18 3R1-05255-0 * COLLAR 4-6-21
19 3R1-05216-0 * STARTER LOCK SPRING
20 3Y0-05253-0 * STARTER LOCK CAM
21 3Y0-05226-0 * STARTER LOCK LEVER
22 3Y0-05258-0 * STARTER LOCK CAM SPRING
23 940103-0600 * WASHER
24 921503-5625 * SCREW
25 3R0-06303-1 * COLLAR 6.2-9-12.3
26 3AL-60108-0 PRE-COATED BOLT 6-1.0-20-50
27 31H-60108-0 PRE-COATED BOLT 6-1.0-30
28 3C8-66308-0 WASHER 6-16-1.5
29 3Y0-05207-0 STARTER LOCK WIRE
30 3C7-03271-2 O-RING 1.5-2.5
31 332-66033-0 STOPPER
32 3V1-05913-0 TAPPING SCREW 5-12
33 3PA-72181-1 CAUTION DECAL (B)
34 31H-06308-0 BELT COVER
35 172-36008-0 GROMMET 13-2
36 3UR-72187-1 CAUTION DECAL (SIGP)
Fig.07 MAGNETO・ELECTRIC PARTS (62 parts) Fig.07 MAGNETO・ELECTRIC PARTS
Ref OEM Part # Part Name
1 31H-06191-0 FLYWHEEL W/RING GEAR
2 3RS-06023-0 ALTERNATOR ASSY
3 3RS-06071-0 PULSAR COIL
4 3T5-10131-0 KEY t=4
5 369-00132-0 NUT 12-P1.25
6 3SS-01116-0 WASHER 13-26-3.2
8 910103-5512 BOLT
9 31H-06903-0 ELECTRIC BRACKET
10 31H-76079-0 COLLAR 6.2-9-6
11 910103-5620 BOLT
12 31T-06401-0 ECU ASSY (8)
13 31H-06410-0 ECU HOLDER
14 31U-76110-0 CORD ASSY
15 3KY-07612-0 * GROMMET
16 3KY-76037-0 * CABLE TERMINAL PLUG
17 3A3-76037-0 CABLE TERMINAL PLUG
18 3KY-06920-0 RUBBER MOUNT
19 31H-06157-0 PROTECTOR
20 369-84398-1 BAND 202
21 31H-06040-0 IGNITION COIL W/R-CAP
22 31H-06999-0 * PLUG CAP W/RESISTANCE
23 910103-5625 BOLT
25 3H6-07611-1 OIL PRESSURE SWITCH
26 921503-6406 * SCREW
27 31H-76010-0 STARTER MOTOR ASSY
28 31H-76015-0 * PINION ASSY
29 31H-75014-0 * BRUSH HOLDER ASSY
33 930203-0600 ** NUT
34 910103-5825 BOLT
35 3AA-76065-0 RECTIFIER COMPLETE
36 3SY-01047-0 PLUG
37 910103-5616 BOLT
38 3B2-76120-1 BATTERY CABLE L=2000
40 3RS-06133-0 PROTECTOR
42 3BJ-76145-0 TERMINAL CAP 15.5-20-28
43 3Y0-76145-0 TERMINAL CAP 8-18-28
45 3B2-76147-2 STARTER CABLE L=200
46 31H-76081-0 NEUTRAL SWITCH BRACKET
47 3NV-76080-0 NEUTRAL SWITCH
48 3RS-76083-0 NEUTRAL SWITCH ACTUATOR
49 910103-5612 BOLT
50 3AA-76026-0 MAIN SWITCH ASSY
51 31H-72510-0 ENGINE TEMP SENSOR
52 31H-76040-0 STARTER SOLENOID
53 910103-5610 BOLT
55 31H-76066-0 FUSE WIRE ASSY
56 3T5-76247-0 * FUSE 20A
57 1E0-34093-0 * CAP (Y)
58 3V1-05913-0 TAPPING SCREW 5-12
59 3R0-76064-0 FUSE HOLDER BRACKET
60 31H-72580-0 PTT SOLENOID SWITCH (A)
63 31H-72581-0 PTT SOLENOID SWITCH (B)
64 930103-0600 * NUT
65 941303-0600 * SPRING WASHER
66 31H-72582-0 SOLENOID SWITCH CORD (A)
68 3A3-76145-0 TERMINAL CAP 8-13-28
69 31H-06869-0 BRACKET
70 31H-72583-0 SOLENOID SWITCH CORD (B)
71 3Y1-76145-0 TERMINAL CAP 8-13-28
72 3KY-84398-0 BAND
73 910103-0610 BOLT
74 940103-0600 WASHER
Fig.08 DRIVE SHAFT HOUSING (21 parts) Fig.08 DRIVE SHAFT HOUSING
Ref OEM Part # Part Name
1 31HW61030-0 DRIVE SHAFT HOUSING ASSY (L)
2 3B2-01215-0 OIL SEAL 12.1-28-5
3 3R3-07705-1 DRAIN BOLT 14-14
4 3R3-07406-0 WASHER 14.5-24-1
5 345-01111-0 DOWEL PIN 6-12
6 369-66043-1 GROMMET 10.7-3.5
7 3RS-72404-0 FLUSHING CONNECTOR CAP
8 3RS-67147-0 SEAL RING
9 31HW61208-0 IDLE EXHAUST PORT COVER
10 3V1-61220-0 IDLE EXHAUST PORT GASKET
11 9101E3-5620 BOLT
12 3V1-61212-0 GROMMET 12.7-16.2
13 3B2W61110-2 EXTENSION HOUSING
14 3V2-60001-0 BOLT 6-35
15 3B2-60003-1 DRIVE SHAFT BUSHING (UL)
16 3V1-64332-0 STOPPER
17 9101E3-5612 BOLT
18 31HW61210-0 APRON
19 3F3-02423-0 TAPPING SCREW 5-30
20 31H-01303-0 ENGINE BASEMENT GASKET
21 3VS-61017-0 BOLT 8-P1.25
Fig.09 GEAR CASE (64 parts) Fig.09 GEAR CASE
Ref OEM Part # Part Name
1 3WBQ60000-0 GEAR CASE ASSY
2 3WB-60211-0 * ROLLER BEARING 15-21-16
3 9601-0-6204 BALL BEARING 6204
4 332-60005-3 PLUG 8-8
5 332-60006-1 GASKET 8.1-15-1
6 3V1-60217-0 TRIM TAB
7 910103-5620 BOLT
8 3AA-60206-0 WATER STRAINER W=17
9 921503-0430 SCREW
10 930403-0400 NYLON NUT 4-P0.7
11 3WBQ60100-0 PROPELLER SHAFT HOUSING ASSY
12 345-65015-0 * O-RING 3.2-47
13 369-60111-0 * OIL SEAL 15-28-10
14 9601-0-6004 * BALL BEARING 6004
15 9101E3-5620 BOLT
16 3B2-64010-1 BEVEL GEAR ASSY (A)
17 3WB-64020-0 BEVEL GEAR B
18 3B2-64030-1 BEVEL GEAR C
19 369-64032-0 WASHER 15.2-19-1.9
20 369-64015-0 SHIM 21-28-0.15
21 3V1-64211-1 PROPELLER SHAFT
22 3B2-64215-0 CLUTCH
23 301-64217-0 PIN 3.5-28
24 3V1-64221-0 SPRING
25 369-64223-0 PUSH ROD
26 3B2-64222-0 SPRING RETAINER
27 3B2-65021-1 WATER PUMP IMPELLER
28 3B2-65022-0 KEY φ3-11
29 3B2-65016-0 PUMP CASE (UPPER)
30 3B2-65011-0 PUMP CASE LINER
31 331-65014-0 WATER PIPE SEAL (LOWER)
32 3B2-65018-2 PUMP CASE GASKET
33 3B2-65025-0 WATER PUMP GUIDE PLATE
34 3B2-65029-2 GUIDE PLATE GASKET
35 9161E3-0650 BOLT
36 9401E3-0600 WASHER
37 3UA-65017-0 PUMP CASE (LOWER)
38 309-60111-0 OIL SEAL 12-24-8
39 3B2-65020-1 PUMP CASE GASKET (LOWER)
40 3B2-64083-0 SHIM 28-36.8-0.3
41 3WB-64309-0 DRIVE SHAFT ASSY (UL)
42 9601-0-6301 * BALL BEARING 6301
43 369-66011-0 CLUTCH CAM
44 951407-0310 SPRING PIN 3-10
45 3V1-66014-0 CAM ROD (UL)
46 3UA-66031-0 CAM ROD BUSHING
47 369-66021-1 O-RING 2.5-4.9
48 332-66032-0 O-RING 2.4-15.4
49 369-66033-0 STOPPER
50 9101E3-5625 BOLT
52 3V2-60001-0 BOLT 6-35
53 3V1-60041-0 WATER SEAL RUBBER
54 3V1-60042-0 WATER SEAL PLATE
55 3V1-65120-0 WATER PIPE (UL)
56 3V1-65206-0 WATER PIPE SEAL (UPPER)
57 3V1-65203-0 LOCK PLATE
58 3V1-65204-0 WATER PIPE AUXILIARY MOUNT 13-2.5
59 9215E3-0510 SCREW
60 3V1B64514-1 PROPELLER ASSY (7)
61 3UB-64231-0 THRUST HOLDER
62 369-64121-0 PROPELLER NUT
63 369-64124-0 WASHER 10.5-28-2
64 951503-0318 SPLIT PIN 3-18
65 3UB-87326-0 PROPELLER HARDWARE KIT
Fig.10 BRACKET (MF/EF MODEL) (58 parts) Fig.10 BRACKET (MF/EF MODEL)
Ref OEM Part # Part Name
1 3V1W62112-2 CLAMP BRACKET (R)
2 3V1W62113-2 CLAMP BRACKET (L)
3 309-62115-2 BOLT 8-122
4 930403-0800 NYLON NUT 8-P1.25
6 307-62116-1 WASHER 8.5-28-1
7 3B2-62118-0 DISTANCE PLATE
8 9216E3-0612 SCREW
9 369-62146-1 STERN BRACKET SPRING
10 921703-0406 SCREW
11 369-62147-0 WASHER 4.3-16-1.5
12 350-62121-2 THRUST ROD
13 369-62122-2 THRUST ROD SPRING
14 3V1W62310-0 SWIVEL BRACKET
16 344-67177-1 GREASE FITTING
17 345-62441-0 FRICTION PIECE
18 346-62421-1 FRICTION SPRING
19 9101E3-0830 BOLT
20 3V1-66322-0 REVERSE LOCK
21 3V1-66313-0 REVERSE LOCK ARM
22 3B2-66321-1 REVERSE LOCK ROD
24 3B2-66315-0 REVERSE LOCK SPRING
25 3V1-66305-1 REVERSE LOCK LINK
26 3C8-63733-0 ROD SNAP 5-3
27 3K9-05223-0 ROD SNAP 4-2
28 31PQ62010-0 STEERING SHAFT ASSY
29 3F0-66227-0 TAPPING SCREW 4-20
30 31H-61313-0 STUD M8-P1.25-65
31 350-62417-0 BUSHING 24-30-30
32 31H-62423-0 THRUST PLATE (UPPER) 25-44-2
33 350-62423-0 THRUST PLATE (UPPER) 25-44-2
34 350-62415-0 O-RING 3.5-22
35 3Z0-61301-0 RUBBER MOUNT (UPPER)
36 3UA-61343-0 BOLT M6-20
37 9401E3-0600 WASHER
38 3V1-61333-1 DAMPER (UPPER)
39 9401E3-0800 WASHER
40 3V1-61324-0 NUT
41 3V1-61302-0 RUBBER MOUNT (LOWER)
42 3V1W61401-0 MOUNT BRACKET (R)
43 3WBQ61402-0 MOUNT BRACKET (L)
44 9101E3-5652 BOLT
46 3A3-62396-1 GROUND L=110
47 910103-5612 BOLT
48 3V1-62431-1 TILT STOPPER ASSY
49 3AS-62433-0 * TILT STOPPER GRIP
50 393-62437-1 BUSHING
51 369-62439-1 SETTING PLATE
52 9101E3-5612 BOLT
53 3V1W62105-2 CLAMP SCREW KIT
54 3V1W62108-1 * CLAMP SCREW ASSY
55 3RS-62106-0 ** CLAMP SCREW
56 3RSW62102-0 ** CLAMP SCREW HANDLE
57 951403-0622 ** SPRING PIN
58 332-62101-1 * CLAMP SCREW PAD
59 945303-0500 * E-RING d=5
60 31H-62004-0 CORD HOLDER
61 338-60218-2 ANODE
62 910103-5620 BOLT
Fig.11 BRACKET (EP MODEL) (42 parts) Fig.11 BRACKET (EP MODEL)
Ref OEM Part # Part Name
1 3AAW62112-1 CLAMP BRACKET (R)
2 3AAW62113-1 CLAMP BRACKET (L)
8 3AA-62116-0 WASHER 22-36-1
9 3AAW62310-1 SWIVEL BRACKET
10 344-67177-1 GREASE FITTING
11 3AA-66322-1 REVERSE LOCK
12 3AA-66315-0 REVERSE LOCK SPRING
13 3AAW62010-0 STEERING SHAFT ASSY
14 3AA-84461-0 TRIM POSITION DECAL
15 3AA-67589-0 LOWER TILT LIMIT DECAL
16 3AA-67584-0 TILT LOCK DECAL
17 3AA-62117-0 DISTANCE PIECE
18 9101E3-5640 BOLT
19 3AA-62163-0 TRIM SETTING PLATE
20 3AA-62164-0 TILT LOCK PIECE
21 3AA-62463-0 KNOB
22 3Y0-66112-0 SPRING
23 921503-0535 SCREW
24 3AA-62994-0 TILT STOPPER BODY
25 3AA-62434-0 SPRING
26 3AA-62995-0 TILT STOPPER SHAFT (UPPER)
27 945303-0600 E-RING d=6
28 3AA-62996-1 TILT STOPPER SHAFT (LOWER)
29 945303-0900 E-RING d=9
30 3AA-63727-0 SPRING
31 332-61315-0 WASHER 10.5-18-1.5
32 3AA-62454-0 TILT STOPPER (L)
33 3AA-62452-0 BOLT 6-12.5-9.5-2.5
34 941403-1000 WAVE WASHER d=10
35 3DN-66316-0 REVERSE LOCK CLIP
36 3AC-62191-0 SWIVEL BRACKET SHAFT ASSY
39 346-62124-1 NYLON NUT 7/8-14
40 3AA-62114-1 PLATE
41 3AA-61199-0 CARRYING HANDLE
42 3AA-83830-0 STEERING HOOK PLATE
43 3AA-83913-0 COLLAR 10.1-20-15
44 9161E3-1045 BOLT
45 940103-1000 WASHER
46 3BJ-72120-1 RIGGING BOLT SET
47 9101E3-0885 * BOLT
48 9401E3-0800 * WASHER
49 930403-0800 * NYLON NUT 8-P1.25
Fig.12 BRACKET (PTT)(EFT/EPT MODEL) (40 parts) Fig.12 BRACKET (PTT)(EFT/EPT MODEL)
Ref OEM Part # Part Name
1 3Z0Q77211-2 CLAMP BRACKET (PTT-R)
7 3Z0Q77212-0 CLAMP BRACKET (PTT-L)
13 3AA-72049-0 CO-PILOT DECAL
14 3Z0-77115-0 TRIM LOCK PIN
15 3P0-66233-0 WASHER 8.1-16-1.5
16 3V5-62442-0 NYLON NUT 8-P1.25
17 910103-5616 BOLT
18 910103-5612 BOLT
19 3V1Q77208-0 SWIVEL BRACKET ASSY
20 3Z0-62476-2 TILT STOPPER
21 369-62433-1 TILT STOPPER GRIP
22 353-63207-0 COLLAR 10.2-24-12
23 940103-1000 WASHER
24 951403-3516 SPRING PIN 3.5-16
25 3R0-62473-0 TILT STOPPER SPRING
26 3Z0-63035-0 FRICTION PIECE
27 346-62127-0 CAP NUT
28 3R3-62443-0 WASHER 8.1-20-0.8
29 3R3-62445-0 BOLT
30 930403-0800 NYLON NUT 8-P1.25
31 940103-0800 WASHER
32 3AA-62447-0 PLATE
33 9101E3-5616 BOLT
34 3R3-62448-1 WASHER 8.5-38-3
35 3R3-62449-0 DISC 8.5-38-2
36 31HQ77151-1 PT ASSY
37 3KY-77071-0 CYLINDER PIN (UPPER)
39 3R0-77076-0 BUSHING 13-17-19.5
40 3Z0-77076-0 BUSHING 13-16-31
41 9101E3-0612 BOLT
42 345-05122-1 WASHER 6.5-23-1.5
43 3Z0-77101-1 CYLINDER PIN (LOWER)
44 910103-0820 BOLT
45 3Z0-84398-0 BAND 203
46 307-62116-1 WASHER 8.5-28-1
47 3AA-62441-0 FRICTION LEVER
48 3Z0-62417-0 BUSHING 24-30-30
49 350-62417-0 BUSHING 24-30-30
50 3H6-60218-0 ANODE
51 398-62396-1 GROUND L=130
Fig.13 POWER TILT (32 parts) Fig.13 POWER TILT
Ref OEM Part # Part Name
1 3Z0-77221-0 CAP ASSY
3 3Z0-77175-0 MANUAL VALVE ASSY
4 3R0-77177-0 * O-RING 2.4-9.8
6 3R0-77171-0 C-RING
7 3AC-77173-0 SEAL WASHER
8 3Z0-77450-0 RELIEF VALVE ASSY
9 3Z0-77179-0 * O-RING
10 3Z0-77460-0 VALVE ASSY
11 3R0-77451-0 * O-RING 1.5-3.5
12 3B7-77169-0 O-RING
13 3B7-77430-0 PUMP
14 3B7-77432-1 BOLT
15 3B7-77431-1 BOLT
16 3B7-77434-1 FILTER
17 3E0-77163-0 COUPLING
18 3R0-77167-0 O-RING 2-62.5
19 3Z1-84398-1 BAND
20 3V1-64333-0 PRE-COATED SCREW 5-12
21 3Z0-77431-0 BOLT
22 31H-77180-1 MOTOR ASSY
23 31H-77192-1 * MOTOR BRACKET ASSY
24 3Z0-77190-0 * ARMATURE ASSY
25 3Z0-77195-0 * YOKE ASSY
26 9215E3-5512 * SCREW
27 3SS-77183-1 ** BRUSH
28 3RS-77191-0 ** BREAKER
29 3Z0-77187-0 ** BREAKER HOLDER
30 3Z0-77167-0 ** O-RING
31 3E0-77184-0 ** BRUSH SPRING
32 921521-5512 ** SCREW
33 3Z0-77186-0 ** BRUSH HOLDER
34 3E0-77193-0 ** OIL SEAL
Fig.14 TILLER HANDLE/SHIFT LEVER (43 parts) Fig.14 TILLER HANDLE/SHIFT LEVER
Ref OEM Part # Part Name
1 31HW63003-0 TILLER HANDLE ASSY
2 350-67154-0 * PLASTIC RIVET 6.5
3 3B2-63104-1 * STUD
4 3R3-63012-0 * GRIP
5 3V1-63041-0 * THROTTLE SHAFT
6 3H6-63048-0 * THROTTLE SHAFT DAMPER
7 3H6-63510-0 * BUSHING 14-15.8-7
8 921803-0520 * SCREW
9 3B2-63063-0 * THROTTLE SHAFT SUPPORT
11 3V1-63035-1 * FRICTION PIECE
12 3V1-63077-0 * ADJUSTING NUT
13 3V1-63036-0 * SPRING
14 910103-0625 * BOLT
15 3RS-06869-0 * BRACKET
16 9215E3-0612 * SCREW
17 31H-06830-0 * STOP SWITCH ASSY
18 3AC-72200-0 * STOP SWITCH DECAL
19 3NV-72019-0 * THROTTLE DECAL
20 3RS-72615-0 PTT SWITCH ASSY
21 3V1-76032-0 SWITCH BOX
22 9215E3-0516 SCREW
23 336-06973-0 CLAMP 6-9.5L
24 9215E3-0512 SCREW
25 3V1-63102-0 BUSHING
26 3RS-63102-0 BUSHING
27 3RS-63108-0 WASHER
28 3RS-63107-1 COVER
29 930103-0600 NUT
30 940203-0600 WASHER
31 31H-63600-0 THROTTLE WIRE
32 3RS-66110-1 SHIFT LEVER
33 3RS-67115-0 WASHER 6.5-30-1
34 346-67115-0 WASHER 6.5-21-1
35 3H6-63619-1 COLLAR 6.5-10.5-10
36 9101E3-0620 BOLT
37 31N-66134-0 SHIFT LEVER ROD
38 31N-06133-0 PROTECTOR 6.4-10-.2-60
39 951603-0600 SNAP PIN d=6
40 3RS-05259-0 WAVE WASHER 13-20-0.3
41 3RS-61315-0 WASHER
42 3YG-67578-0 SHIFT DECAL
43 31H-63609-0 FLEX BRAIDED SLEEVE
44 369-84398-1 BAND 202
Fig.15 BOTTOM COWL/SHIFT (52 parts) Fig.15 BOTTOM COWL/SHIFT
Ref OEM Part # Part Name
1 31HW67100-1 BOTTOM COWL
2 3R3-71040-0 PILOT LAMP ASSY
3 3R3-67162-0 GROMMET 25-15-3
5 3R3-66226-0 GROMMET 40-18-3
6 3RS-66260-1 GROMMET
7 3AA-67120-1 COWL LATCH ASSY
10 3V1-69000-0 STARTER LOCK CABLE BRACKET
12 394-70260-1 FUEL CONNECTOR (MALE)
14 3H6-70262-0 FUEL CONNECTOR PROTECTOR
15 9101E3-5625 BOLT
16 345-67161-0 GROMMET 22-3
17 31H-66135-0 SHIFT LEVER SHAFT
18 3V1-66225-0 SHIFT ROD LEVER
19 31H-66155-0 LEVER
20 921503-0414 SCREW
21 940103-0400 WASHER
22 3V1-66187-0 SEAL RING 23-29-3.7
23 3B2-67187-0 GROMMET 16-17.5
24 3UA-66113-0 SHIFT DETENT SPRING t=0.8
25 3Y1-66117-0 SHIFT DETENT SUPPORTER t=0.8
27 3V1-66145-0 HOLDER
29 3V1-66211-1 SHIFT ROD
30 3V1-66241-0 SHIFT ROD JOINT
31 951403-0310 SPRING PIN 3-10
32 3V1-66302-1 REVERSE LOCK LINK JOINT
33 921503-0612 SCREW
34 31H-66129-0 SHIFT LEVER (REMOTE CONTROL)
35 31H-66128-0 SHIFT ARM (REMOTE CONTROL)
36 941403-1400 WAVE WASHER d=14
37 3V1-66142-0 PIVOT
38 369-67105-0 HOOK LEVER BUSHING
39 338-67147-0 SEAL RING 13.8-22-3.7
40 910103-5612 BOLT
41 346-67115-0 WASHER 6.5-21-1
42 31H-66134-0 SHIFT LEVER ROD
45 31HW67481-0 SHIFT LEVER BRACKET COVER
46 910103-5625 BOLT
47 31H-83732-0 GROMMET
48 3AA-83820-0 CABLE CLIP ASSY
49 9101E3-0616 BOLT
50 930103-0600 NUT
51 3B7-83715-2 CABLE JOINT
52 31H-70251-0 FUEL CONNECTOR STAY
53 9101E3-5616 BOLT
54 910103-5616 BOLT
55 31HQ67483-0 REMOTE CONT CABLE STAY COVER
56 3RS-72615-0 PTT SWITCH ASSY
57 3AA-83719-0 WASHER 8.5-18-1.6
58 951603-0800 SNAP PIN d=8
59 31H-66145-0 HOLDER
60 345-67117-0 GROMMET 17-2.7
61 3H6-67572-1 STORAGE DECAL
Fig.16 TOP COWL (13 parts) Fig.16 TOP COWL
Ref OEM Part # Part Name
1 31WW67645-0 TOP COWL ASSY
2 31HW67640-0 TOP COWL SUB-ASSY
3 31H-67501-0 * TOP COWL SEAL
4 3ZB-67541-0 SIDE DECAL
5 3WL-67536-0 REAR DECAL (6)
6 3ZB-67538-0 SIMPLIQ DECAL
7 3WF-67545-0 FUEL INJECTION DECAL
8 3RT-67580-0 LOGO DECAL
9 3YG-72180-0 CAUTION DECAL (A)
10 3VS-67587-0 START DECAL
11 3F0-72185-0 CAUTION DECAL
12 3AC-76190-0 WARNING DECAL
14 31H-38136-1 MAINTENANCE LABEL
Fig.17 SEPARATE FUEL TANK (20 parts) Fig.17 SEPARATE FUEL TANK
Ref OEM Part # Part Name
1 3H6-70200-2 PRIMER BULB ASSY
2 3C7-70220-1 * JOINT ASSY (INLET)
3 332-70201-0 * CLAMP
4 3C7-70224-1 * JOINT ASSY (OUTLET)
5 3GF-70211-1 * PRIMER BULB
6 3C7-70217-0 * CLAMP
7 98AB-70-700 * HOSE
8 98AB-701600 * HOSE
9 3GR-70280-0 * FUEL CONNECTOR MARK
10 3GF-70281-0 * FUEL CONNECTOR
11 3GR-70250-0 * FUEL CONNECTOR
12 3UA-70167-0 FUEL TANK ASSY 12L
13 3AC-70052-1 * FUEL TANK CAP ASSY
14 3AC-70055-0 * RETAINING RING
15 3E0-70270-0 * QUICK-CONNECTOR (MALE)
16 3B2-70155-1 * PICK-UP ELBOW ASSY (12L)
17 3C7-70199-0 ** O-RING
18 3C7-70113-0 ** FILTER
19 3RS-70020-0 * FUEL TANK CAP ASSY
20 3RS-70021-0 ** TANK FILLER CAP GASKET
Fig.18 COMPONENT PARTS OF REMOTE CONTROL (57 parts) Fig.18 COMPONENT PARTS OF REMOTE CONTROL
Ref OEM Part # Part Name
1 3U2B84350-1 REMOTE CONTROL HEAD ASSY (RC12C)
2 3A3-84365-1 * THROTTLE ARM
3 3A3-84428-0 * THROTTLE FRICTION ARM
4 945303-0600 * E-RING d=6
5 353-84394-0 * WASHER
6 3U2-84427-0 * ADJUSTING SCREW
7 3A3-84381-0 * SHIFT GEAR ASSY
8 3A3-83314-2 * CABLE TERMINAL
9 3A3-84364-2 * DRIVE GEAR
10 930103-0500 * NUT
11 910103-0525 * BOLT
12 3A3-84376-0 * GROMMET
13 3U2B84441-0 * REAR HOUSING
14 3U2B84366-0 * REAR PANEL
15 3U2-84401-0 * NEUTRAL LOCK ARM
16 3A3-84403-0 * NEUTRAL LOCK SPRING
17 3U2-84404-0 * GRIP
18 3U2-84343-0 * CONTROL LEVER
19 3A3-84368-0 * WAVE WASHER
20 3A3-84391-0 * FREE THROTTLE DRUM
21 3A3-84435-0 * BUSHING
22 3A3-84422-0 * THRUST PLATE
23 921603-0512 * SCREW
24 3U2-84339-1 * INSTRUCTION DECAL
25 3A3-84432-0 * BUSHING
26 3U2-84375-0 * SCREW
27 3VK-84375-0 * SCREW
28 3VL-84375-0 * SCREW
29 3A3-84374-0 * SPACER
30 353-84371-0 * WASHER
31 3U2-84371-0 * WASHER
32 930103-0600 * NUT
33 3A3-84383-0 * WASHER
34 3A3-84421-0 * ROLLER
35 3U2-84431-0 * BUSHING
36 940103-0800 * WASHER
37 3U2-84442-0 * BOLT
38 353-84388-0 * DETENT ROLLER
39 3U2B84312-0 * FREE THROTTLE LEVER
40 921503-0406 * SCREW
41 3A3-84423-0 * DETENT RETAINER
42 3A3-84307-0 * DETENT SPRING
43 3A3-84424-0 * FREE THROTTLE ROLLER
44 3A3-84426-0 * ROLLER RETAINER
45 3A3-84425-0 * FREE THROTTLE SPRING
46 3VK-63107-0 * COVER
47 3U2-63506-0 * HOLDER
48 3U2-84917-0 * BOLT
49 3U2-77367-0 * JOINT
50 3U2-06973-0 * CLAMP
51 3U2-72187-0 * CAUTION DECAL (SIGP)
52 3U2B84440-0 * FRONT HOUSING
53 3U2-84452-0 * TILT SWITCH PLUG
54 353-76037-0 * CABLE TERMINAL PLUG
55 3U2-84414-0 * GROMMET
56 361-84415-0 * GROMMET
57 3A3-76037-0 * CABLE TERMINAL PLUG
Fig.19 COMPONENT PARTS OF REMOTE CONTROL (ELECTRIC PARTS) (16 parts) Fig.19 COMPONENT PARTS OF REMOTE CONTROL (ELECTRIC PARTS)
Ref OEM Part # Part Name
1 3GF-76020-0 MAIN SWITCH ASSY
2 3GF-76219-0 * MAIN SWITCH KEY No.945
3 3GF-76205-0 * MAIN SWITCH KEY COVERING CAP
4 3A3-76115-1 CORD ASSY L=6200
5 353-72546-0 ASSIST CORD (RED) L=200
6 3U2-84331-0 DECAL (LEVER)
7 3U2-84336-1 SHIFT POSITION DECAL
10 3A3-76086-1 NEUTRAL SWITCH (REMOTE CONT)
11 921503-5316 SCREW
12 3U2-72615-0 PTT SWITCH ASSY
13 3C8-76171-0 OVERHEAT BUZZER
14 3A3-06830-0 STOP SWITCH ASSY
15 31H-06848-0 * STOP SWITCH LANYARD ASSY
16 3U2-72200-0 STOP SWITCH DECAL
17 3U2-84334-0 REMOTE CONTROL LOGO DECAL
18 3U2-84398-0 BAND
Fig.20 OPTIONAL PARTS・ACCESSORIES (24 parts) Fig.20 OPTIONAL PARTS・ACCESSORIES
Ref OEM Part # Part Name
1 3BJ-72100-1 TOOL KIT
2 3B7-72201-0 SAFETY ROPE φ5-1600
3 3KY-72539-0 TACHOMETER LEAD WIRE L=2000
4 31N-06128-0 ALTERNATOR KIT
5 3RT-06023-0 * ALTERNATOR ASSY
6 31N-76160-0 * RECTIFIER KIT
7 3RS-76060-0 ** RECTIFIER COMPLETE
8 910103-5620 ** BOLT
9 31H-76161-0 ** EXTENSION CORD
10 1E0-34093-0 *** CAP (Y)
11 3T5-76247-0 *** FUSE 20A
12 910103-5612 ** BOLT
13 3KY-84398-0 ** BAND
14 369-84398-1 ** BAND 202
15 3SY-01047-0 ** PLUG
16 3V1-05913-0 ** TAPPING SCREW 5-12
17 3R0-76064-0 ** FUSE HOLDER BRACKET
18 910103-5630 ** BOLT
19 3H6-63619-1 ** COLLAR 6.5-10.5-10
20 3T1-72405-0 HOSE JOINT (WATER-WORKS)
21 3UA-72537-0 METER LEAD WIRE L=2000
22 3PB-72638-2 TACHOMETER KIT
23 3GR-06821-0 CORD
24 336-60007-0 FLUSHING PLUG
Fig.21 ASSEMBLY・KIT PARTS (10 parts) Fig.21 ASSEMBLY・KIT PARTS
Ref OEM Part # Part Name
1 3WBQ87304-0 LOWER UNIT ASSY (UL)
2 31PB87090-0 ENGINE SHORT BLOCK KIT
3 3V1-01024-0 * CYLINDER HEAD COVER GASKET
4 3B2-87321-5 LOWER UNIT GASKET SET
5 9161E3-0650 * BOLT
6 3B2-65239-0 * WATER PUMP GUIDE PLATE
7 9101E3-5612 * BOLT
8 940103-0600 * WASHER
9 3Z0-61334-0 * WASHER 8.5-34-3
10 9701-1-1103 * SPARK PLUG (DCPR6E)
Fig.22 REMOTE CONTROL FITTING KIT/DRAG LINK (30 parts) Fig.22 REMOTE CONTROL FITTING KIT/DRAG LINK
Ref OEM Part # Part Name
1 31H-83880-1 REMOTE CONTROL FITTING ASSY
2 31H-83732-0 * GROMMET
3 3AA-83820-0 * CABLE CLIP ASSY
4 9101E3-0616 * BOLT
5 9301E3-0600 * NUT
6 31H-66134-0 * SHIFT LEVER ROD
8 3B7-83715-2 * CABLE JOINT
10 3AA-83719-0 * WASHER 8.5-18-1.6
11 951603-0800 * SNAP PIN d=8
12 31H-66128-0 * SHIFT ARM (REMOTE CONTROL)
13 3V1-66142-0 * PIVOT
14 369-67105-0 * HOOK LEVER BUSHING
15 338-67147-0 * SEAL RING 13.8-22-3.7
16 941403-1400 * WAVE WASHER d=14
18 346-67115-0 * WASHER 6.5-21-1
20 9101E3-5825 * BOLT
21 9301E3-0800 * NUT
22 31H-02160-0 * FUEL HOSE W/PROTECTOR
23 9101E3-5625 * BOLT
24 345-67161-0 * GROMMET 22-3
25 910103-5612 * BOLT
26 31H-66129-0 * SHIFT LEVER (REMOTE CONTROL)
27 921503-0414 * SCREW
28 940103-0400 * WASHER
31 3AA-84905-0 DRAG LINK ASSY
32 3E0-84914-0 * SPACER 9.6-19-13
33 3C8-84964-0 * BOLT 3/8-24UNF-35-A2-50
34 353-84918-0 * NYLON NUT 3/8-24UNF
35 353-84916-0 * WASHER 9.6-18-2
36 3F3-84908-0 * SEAL RING

100-Hour / Annual Service Checklist

Regular maintenance keeps your Tohatsu MFS6CZ/8C/9.8C/9.9CY 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. Change engine oil and oil filter (check drain plug washer)
  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. Check valve clearance (refer to service manual for specifications)
  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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