Tohatsu MFS2/2.5/3.5C (2022) Parts & Diagrams

OEM and aftermarket replacement parts for Tohatsu MFS2/2.5/3.5C. Scroll down for exploded parts diagrams (17), specifications, and maintenance reference.

Tohatsu MFS2/2.5/3.5C (2022) Parts & Diagrams

🔎 Tohatsu MFS2/2.5/3.5C Reference Library — Exploded parts diagrams (17 diagrams), specifications, common issues, and maintenance checklist.

The Tohatsu MFS2/2.5/3.5C is a 4-Stroke OHV 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 OHV Single Cylinder
Horsepower 2 HP
Displacement 85.5 cc
Bore x Stroke 55.0 x 36.0 mm
Spark Plug (Type & Gap) NGK DCPR6E
Engine Oil Capacity 0.3 L
Recommended Engine Oil SAE 10W-30
Gear Case Oil Capacity 0.18 L
Idle Speed (in gear) 1200 RPM
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 MFS2/2.5/3.5C:

  • 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 MFS2/2.5/3.5C.

Fig.01 CYLINDER・CRANK CASE (38 parts) Fig.01 CYLINDER・CRANK CASE
Ref OEM Part # Part Name
1 3GTB01100-2 CYL BLOCK & CRANKCASE ASSY
2 3R3-07204-0 * INTAKE VALVE STEM SEAL
3 3R3-07206-0 * EXHAUST VALVE STEM SEAL
4 345-01111-0 * DOWEL PIN 6-12
5 910114-5635 * BOLT
6 9161F9-0675 * BOLT
7 9401E3-0600 * WASHER
8 3R0-71015-1 OIL FILLER CAP
9 3R0-07422-0 O-RING 3.1-24.4
10 3GT-07810-1 CAMSHAFT ASSY
11 3AB-07201-0 INTAKE VALVE
12 3V1-07202-0 EXHAUST VALVE
13 3AE-07203-0 VALVE SPRING L=35
14 3GT-07921-0 RETAINER
15 3KY-07923-0 COTTER
16 3GR-07905-0 VALVE SPRING SEAT
17 3AB-07231-0 LIFTER
18 3H6-07232-0 PUSH ROD
19 3AB-07233-0 PLATE
20 3H6-07234-0 PIVOT BOLT
21 3AB-07235-0 ROCKER ARM
22 3H6-07236-0 PIVOT
23 3H6-07937-0 ADJUSTING NUT
24 3ABB01021-0 CYLINDER HEAD COVER
25 3AB-01024-1 CYLINDER HEAD COVER GASKET
26 910103-0616 BOLT
27 3C8-66308-0 WASHER 6-16-1.5
28 3H6-01030-0 THERMOSTAT
29 3ABB01031-0 THERMOSTAT CAP
30 3GTB01031-0 THERMOSTAT CAP
31 3AB-01032-0 THERMOSTAT CAP GASKET
32 398-06972-1 CLAMP 6.5-67P
33 9101E3-5630 BOLT
34 3AB-07431-0 BREATHER CHAMBER COVER
35 3AB-07432-0 GASKET
36 910103-5616 BOLT
37 3AB-07640-0 SLINGER
38 9701-1-1103 SPARK PLUG(DCPR6E)
Fig.02 PISTON・CRANK SHAFT (16 parts) Fig.02 PISTON・CRANK SHAFT
Ref OEM Part # Part Name
1 3AB-00070-1 CRANKSHAFT ASSY W/GEAR
2 9603-3-6204 * BALL BEARING 6204
2a 9601-3-6204 * BALL BEARING 6204
3 3AB-00115-0 THRUST PLATE 20.2-32-1
4 3AB-00121-0 OIL SEAL 20-35-7
5 3AB-00040-3 CONNECTING ROD ASSY
6 3AB-00059-0 * CONNECTING ROD BOLT
7 309-00131-0 KEY 10-3.7-3
8 3GT-87130-0 PISTON REPAIR KIT
9 3AB-00001-1 * PISTON
10 332-00021-1 * PISTON PIN
11 350-00024-1 * PISTON PIN CLIP
12 3FK-87123-0 PISTON RING SET
13 3V1-00011-0 * PISTON RING
14 3V1-00012-0 * PISTON RING
15 3V1-00013-0 * PISTON RING-OIL
Fig.03 OIL PAN (17 parts) Fig.03 OIL PAN
Ref OEM Part # Part Name
1 3ABB07400-0 OILPAN ASSY
2 3AB-07421-0 * OIL SIGHT GAUGE
3 345-01111-0 DOWEL PIN 6-12
4 3H6-07705-1 DRAIN BOLT 10-14 P1.25
5 3H6-07406-0 WASHER 10.2-19-1
6 3AB-07402-0 OILPAN GASKET
7 910114-5635 BOLT
8 3GT-05101-0 BRACKET
9 3A0-76079-0 COLLAR 6.2-9-7.4
10 910103-5620 BOLT
11 98AB-50-080 HOSE
12 338-02215-0 CLIP φ10
13 3AB-61012-0 DRIVE SHAFT HOUSING GASKET
14 3AB-01210-0 CRANKCASE HEAD
15 3AB-01215-0 OIL SEAL 10.1-20-7
16 3V1-02012-0 O-RING 2.4-35.2
17 9101E3-5620 BOLT
Fig.04 INTAKE MANIFOLD・CARBURETOR (36 parts) Fig.04 INTAKE MANIFOLD・CARBURETOR
Ref OEM Part # Part Name
1 3BRB02091-1 INTAKE MANIFOLD
2 3GTB02010-1 INTAKE MANIFOLD ASSY
3 98AB-70-185 HOSE
4 3V1-76148-0 SPIRAL TUBE PROTECTOR φ10-100
5 3C7-02215-0 CLIP φ12
6 3AB-02104-0 INTAKE MANIFOLD GASKET
7 910114-5630 BOLT
8 3WE-03200-0 CARBURETOR ASSY
9 3R4-03252-0 * MAIN NOZZLE
10 3R1-03251-0 * MAIN JET (#65)
11 3GU-04930-0 * SLOW AIR JET (#130)
12 3GT-03231-0 * FLOAT
13 3H6-03240-0 * FLOAT VALVE
14 3H6-03244-0 * CLIP
15 3H6-03232-0 * FLOAT ARM PIN
16 3GT-03221-0 * FLOAT CHAMBER
17 3H6-03222-0 * FLOAT CHAMBER O-RING
18 922503-6412 * SCREW
19 3H6-03292-0 * DRAIN SCREW
20 3H6-03293-0 * O-RING
21 3AB-03265-0 * STOP SCREW
22 3H6-03267-0 * SPRING
23 3GT-03256-0 * RUBBER CAP
24 3AS-03266-0 * PILOT SCREW
25 3H6-02011-0 CARBURETOR GASKET
26 3H6-03952-1 INSULATOR
27 3GR-02409-0 INTAKE SILENCER ASSY
29 3A0-76079-0 COLLAR 6.2-9-7.4
31 9161F1-0685 BOLT
32 940103-0600 WASHER
36 98AB-30-230 HOSE
37 3AB-07435-0 BREATHER HOSE
38 3GT-04000-1 FUEL PUMP ASSY
39 910103-5620 BOLT
40 338-02215-0 CLIP φ10
41 3GT-02161-0 FUEL HOSE W/PROTECTOR L=390
Fig.05 THROTTLE (9 parts) Fig.05 THROTTLE
Ref OEM Part # Part Name
1 3ABB63508-0 THROTTLE WIRE BRACKET
2 398-06972-1 CLAMP 6.5-67P
3 910103-5625 BOLT
4 3H6-63611-0 THROTTLE DRUM
5 3H6-63612-0 THROTTLE OPENER
6 3H6-63618-0 COLLAR 6.5-10.5-22.6
7 910103-0635 BOLT
8 3C8-66308-0 WASHER 6-16-1.5
9 3AB-63617-0 THROTTLE ROD
Fig.06 RECOIL STARTER (17 parts) Fig.06 RECOIL STARTER
Ref OEM Part # Part Name
1 3AB-05090-0 RECOIL STARTER ASSY
2 3AA-67503-0 * STARTER SEAL
3 3AB-05004-0 * STARTER SPRING
4 3AB-05104-0 * REEL
5 3AB-05013-0 * STARTER ROPE φ3.5-1200
6 3AB-05003-0 * RATCHET
7 3AB-05012-0 * RETURN SPRING
8 3AB-05006-0 * FRICTION PLATE
9 3AB-05138-0 * BOLT
10 3AB-05007-0 * FRICTION SPRING
11 3AB-05019-0 * STARTER HANDLE
12 3AB-05131-0 * ROPE ANCHOR
13 3AB-05134-0 * ROPE ANCHOR PLATE
14 3GT-60108-0 PRE-COATED BOLT 6-60
15 3C8-66308-0 WASHER 6-16-1.5
16 398-06972-1 CLAMP 6.5-67P
17 3PA-72181-1 CAUTION DECAL (B)
Fig.07 MAGNETO (9 parts) Fig.07 MAGNETO
Ref OEM Part # Part Name
1 3GT-06001-0 FLYWHEEL
2 940121-1000 WASHER
3 309-00132-0 NUT 10-P1.25
4 3GT-06041-0 IGNITER W/R-CAP
5 3H6-06999-0 * PLUG CAP W/RESISTANCE
6 910103-5625 BOLT
7 3AB-06300-1 RING GEAR COVER ASSY
8 3AB-06303-1 COLLAR 6.2-9-35
9 3UR-72187-1 CAUTION DECAL (SIGP)
Fig.08 DRIVE SHAFT HOUSING (21 parts) Fig.08 DRIVE SHAFT HOUSING
Ref OEM Part # Part Name
1 3ABQ61020-4 DRIVE SHAFT HOUSING ASSY (S)
1a 344-67177-1 GREASE FITTING
2 3ABQ62001-1 STEERING BRACKET
3 9101E3-5835 BOLT
4 345-01111-0 DOWEL PIN 6-12
6 9101E3-5630 BOLT
7 9106E3-0808 BOLT
8 332-60006-1 GASKET 8.1-15-1
9 369-61016-0 GROMMET 29-3
10 98AB-30-050 HOSE
11 3ABQ61100-0 EXTENSION HOUSING
12 3AB-60003-0 DRIVE SHAFT BUSHING
13 3AB-64332-0 STOPPER
14 172-36008-0 GROMMET 13-2
15 9101E3-5612 BOLT
16 3AB-01111-0 DOWEL PIN 6-12
17 3GU-60001-0 BOLT 6-30
18 3F0-61101-1 STUD 6-171
19 9301E3-0600 NUT
20 9401E3-0600 WASHER
21 3GR-76191-0 HIGH TEMPERATURE CAUTION DECAL
Fig.09 SHIFT (12 parts) Fig.09 SHIFT
Ref OEM Part # Part Name
1 3AB-66214-0 SHIFT ROD (S)
2 940103-0600 WASHER
3 951503-0212 SPLIT PIN 2-12
4 369-66241-0 SHIFT ROD JOINT ASSY
5 910103-5616 BOLT
6 3AB-66130-1 SHIFT LEVER SHAFT ASSY
7 345-66021-0 O-RING 1.9-6.8
8 369-66116-0 CERAMIC BALL 7.7
9 369-66112-1 SPRING
10 332-61315-0 WASHER 10.5-18-1.5
11 3AB-66225-0 SHIFT ROD LEVER
12 910903-6512 BOLT
Fig.10 GEAR CASE (49 parts) Fig.10 GEAR CASE
Ref OEM Part # Part Name
1 3BMQ60000-2 GEAR CASE ASSY
3 338-60218-2 * ANODE
4 910103-0616 * BOLT
5 332-60005-2 PLUG 8-8
6 332-60006-1 GASKET 8.1-15-1
7 9601-0-6004 BALL BEARING 6004
8 369-64015-0 SHIM 21-28-0.15
9 3GR-64010-0 BEVEL GEAR ASSY (A)
10 3F0-64302-0 DRIVE SHAFT ASSY (L)
11 9601-0-6000 * BALL BEARING 6000
12 3F0-64321-0 SPACER 10.1-15-72
13 3GR-64020-0 BEVEL GEAR B
14 3F0-66011-0 CLUTCH CAM
15 3F0-66013-0 CAM ROD (L)
16 951407-0308 SPRING PIN 3-8
17 3F0-65020-0 PUMP CASE GASKET (LOWER)
18 3H2-65040-1 PUMP CASE ASSY (LOWER)
19 3F0-60223-0 * OIL SEAL 10-22-8
20 3B2-65022-0 KEY φ3-11
21 3F0-65029-0 GUIDE PLATE GASKET
22 3AB-65025-0 WATER PUMP GUIDE PLATE
23 3F0-65018-0 PUMP CASE GASKET
24 369-66021-1 O-RING 2.5-4.9
25 301-66023-0 O-RING 2.4-9.5
26 3F0-66031-0 CAM ROD BUSHING
27 369-65021-1 WATER PUMP IMPELLER
28 369-65022-0 KEY φ2-11
29 3F0-65016-0 PUMP CASE (UPPER)
30 3F0-65011-0 PUMP CASE LINER
31 3F0-65032-0 GROMMET
32 9161E3-0645 BOLT
33 940103-0600 WASHER
34 941303-0600 SPRING WASHER
35 3F0-64215-0 CLUTCH
36 3F0-64221-0 SPRING
37 3F0-64223-0 PUSH ROD
38 3F0-64211-0 PROPELLER SHAFT
39 3F0Q87323-1 PROPELLER SHAFT HOUSING ASSY
40 3F0Q60101-1 * PROPELLER SHAFT HOUSING
41 9601-0-6001 * BALL BEARING 6001
42 309-60111-0 * OIL SEAL 12-24-8
43 345-65015-0 * O-RING 3.2-47
44 9101E3-5620 BOLT
45 3GU-60001-0 BOLT 6-30
46 309-64126-1 SHEAR PIN 4-24
47 951503-0435 SPLIT PIN 4-35
48 3AB-65192-0 WATER PIPE ASSY (L)
49 3AB-65031-0 * GROMMET
50 3F0B64512-0 PROPELLER ASSY (6")
Fig.11 CLAMP BRACKET・SWIVEL BRACKET (34 parts) Fig.11 CLAMP BRACKET・SWIVEL BRACKET
Ref OEM Part # Part Name
1 3ABQ62111-2 CLAMP BRACKET
2 301-66023-0 O-RING 2.4-9.5
3 309-62463-0 KNOB
4 3AB-62464-3 TILT STOPPER
5 3ABQ62391-1 SWIVEL BRACKET A
6 3AB-66334-1 STOPPER
7 3AB-63068-0 LEVER
8 951403-0212 SPRING PIN 2-12
9 3AB-66336-0 SPRING
10 9161E3-0650 BOLT
12 309-62115-2 BOLT 8-122
13 930403-0800 NYLON NUT 8-P1.25
14 307-62116-1 WASHER 8.5-28-1
15 309-62117-1 DISTANCE PIECE
16 930103-0600 NUT
18 3AB-62212-0 THRUST SUPPORTER
19 3AB-61336-1 DAMPER (LOWER)
20 3F0-62160-0 THRUST ROD ASSY
21 3ABQ62392-1 SWIVEL BRACKET B
22 309-62441-2 FRICTION PIECE
23 309-62446-1 SPRING
24 9401E3-0600 WASHER
25 3GT-62442-0 FRICTION KNOB
26 3AB-62321-1 BUSHING
27 393-62416-1 BUSHING
28 3H6-62325-0 THRUST BUSHING
29 3V1-60001-1 BOLT 6-35
30 3GTQ62105-1 CLAMP SCREW KIT
31 3GTQ62108-1 * CLAMP SCREW ASSY
32 369-62106-1 ** CLAMP SCREW
33 3ABQ62102-0 ** CLAMP SCREW HANDLE
34 3C8-62104-2 ** RIVET 3-22
35 332-62101-1 * CLAMP SCREW PAD
36 3C8-62107-0 * SHOULDER BOLT
Fig.12 TILLER HANDLE (21 parts) Fig.12 TILLER HANDLE
Ref OEM Part # Part Name
1 3V1Q63003-6 TILLER HANDLE ASSY
2 3V1Q63011-3 * TILLER HANDLE
3 3H6-63510-0 * BUSHING 14-15.8-7
4 3H6-63048-0 * THROTTLE SHAFT DAMPER
5 3V1-63041-0 * THROTTLE SHAFT
6 3R3-63012-0 * GRIP
7 920803-0518 * SCREW
8 3V1-63035-1 * FRICTION PIECE
9 3V1-63077-0 * ADJUSTING NUT
10 3V1-63036-0 * SPRING
11 910103-0625 * BOLT
12 3B2-63063-0 * THROTTLE SHAFT SUPPORT
13 9215E3-0612 * SCREW
13a 350-67154-0 * PLASTIC RIVET 6.5
14 3V9-72019-1 * THROTTLE DECAL
15 3V1-63600-0 THROTTLE WIRE
16 3H9-70313-0 FUEL HOSE PROTECTOR
17 3AB-63102-0 BUSHING
18 3BR-63102-1 BUSHING 32-34-11.8
19 3V1-63107-0 COVER
20 9101E3-0616 BOLT
Fig.13 BOTTOM COWL (19 parts) Fig.13 BOTTOM COWL
Ref OEM Part # Part Name
1 3WEQ67100-0 BOTTOM COWL
2 3GT-67120-1 COWL LATCH ASSY
3 3A0-76079-0 COLLAR 6.2-9-7.4
4 910103-5616 BOLT
5 3AB-67104-0 CHOKE ROD BUSHING
6 3H6-67151-1 CHOKE ROD
7 3LR-67197-0 CHOKE WIRE
8 346-67115-0 WASHER 6.5-21-1
9 910103-0612 BOLT
10 3GR-06870-0 STOP SWITCH ASSY
11 353-06821-0 * STOP SWITCH LANYARD ASSY
12 910103-5612 BOLT
13 353-06283-0 COLLAR 6.4-10-4.7
14 9101E3-0616 BOLT
15 3C8-66308-0 WASHER 6-16-1.5
16 3WE-67578-0 SHIFT DECAL
17 3WE-72024-0 FUEL LEVER DECAL
18 3WE-72046-0 OIL LEVEL DECAL
20 3AC-72200-0 STOP SWITCH DECAL
Fig.14 TOP COWL (7 parts) Fig.14 TOP COWL
Ref OEM Part # Part Name
1 3WL-72180-0 CAUTION DECAL (A)
2 3WEQ67645-0 TOP COWL ASSY
3 3WEQ67640-0 * TOP COWL SUB-ASSY
8 3GT-67501-0 ** TOP COWL SEAL L=1100
9 3WH-87801-0 * DECAL SET(MFS2C)
10 3WE-67580-0 * LOGO DECAL
11 3C7-72191-0 CAUTION DECAL (PL-B)
Fig.15 FUEL TANK (23 parts) Fig.15 FUEL TANK
Ref OEM Part # Part Name
1 3GT-70310-1 FUEL TANK ASSY
2 3AB-06846-1 COVER
3 3T5-76079-0 COLLAR 6.2-9-10.7
4 3C8-66308-0 WASHER 6-16-1.5
5 910103-0625 BOLT
6 369-70311-0 FUEL COCK ASSY
7 3GT-70326-0 FUEL HOSE 155-20-20
8 3GT-02165-0 FUEL HOSE W/PROTECTOR L=340
9 3GT-35143-0 CLIP φ9.4
10 3GT-70325-0 FUEL HOSE L=215
11 3GT-02175-0 FUEL HOSE W/PROTECTOR L=215
12 3AB-02215-1 CLIP φ15
13 3GT-70062-0 FUEL COCK KNOB
14 3G9-66136-0 O-RING 2-10
15 369-70063-0 SEAL RING
16 3WE-72183-0 CAUTION TAG (B)
17 3AB-70036-1 FUEL TANK SEAL
18 3GT-70321-0 FUEL TANK CAP ASSY
19 3GP-70020-0 FUEL TANK CAP ASSY
20 3GR-70021-0 * TANK FILLER CAP GASKET
21 940103-0400 * WASHER
22 3H9-70095-0 * HOOK
23 951503-1610 * SPLIT PIN 1.6-10
Fig.16 OPTIONAL PARTS (ACCESSORIES) (4 parts) Fig.16 OPTIONAL PARTS (ACCESSORIES)
Ref OEM Part # Part Name
1 3BJ-72100-0 TOOL KIT
2 312-72201-0 SAFETY ROPE φ4-1000
3 336-60007-0 FLUSHING PLUG
4 3LR-10230-0 ALTITUDE ADJUSTMENT KIT
Fig.17 ASSEMBLY・KIT PARTS (8 parts) Fig.17 ASSEMBLY・KIT PARTS
Ref OEM Part # Part Name
1 3BMQ87302-3 LOWER UNIT ASSY (L)
2 3GUB87090-0 ENGINE SHORT BLOCK KIT
3 922503-6412 * SCREW
4 3V1-02012-0 * O-RING 2.4-35.2
5 3AB-87322-0 WATER PUMP REPAIR KIT
6 3F0-87321-0 LOWER UNIT GASKET SET
7 951407-0308 * SPRING PIN 3-8
8 9701-1-1103 * SPARK PLUG(DCPR6E)

100-Hour / Annual Service Checklist

Regular maintenance keeps your Tohatsu MFS2/2.5/3.5C 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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