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Tohatsu M8/9.8B (2025) Parts & Diagrams
🔎 Tohatsu M8/9.8B Reference Library — Exploded parts diagrams (19 diagrams), specifications, common issues, and maintenance checklist.
The Tohatsu M8/9.8B is a 2-Stroke outboard motor. A popular choice for small fishing boats, inflatable RIBs, and sailboat auxiliaries.
Quick Reference Specifications
| Specification | Value |
|---|---|
| Engine Type | 2-Stroke |
| Horsepower | 8 HP |
| Displacement | 169 |
| Bore x Stroke | 50 x 43 |
| Spark Plug (Type & Gap) | NGK BPR7HS-10 |
| Engine Oil Capacity | — |
| Recommended Engine Oil | TC-W3 Certified 2-Stroke Oil |
| Gear Case Oil Capacity | 320 mL |
| Idle Speed (in gear) | 750 |
| Full Throttle RPM Range | 5000-6000 |
| Fuel | Unleaded Gasoline, 87 Octane min. |
Always verify specifications against your owner's manual for your specific serial number range.
Common Issues & Recommended Parts
Below are common maintenance scenarios for the Tohatsu M8/9.8B:
- 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 M8/9.8B.
▶Fig.01 CYLINDER・CRANK CASE (33 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3K9B01100-1 | CYL BLOCK & CRANKCASE ASSY |
| 2 | 393-01137-0 | * NIPPLE 5-4-5 |
| 4 | 345-01111-0 | * DOWEL PIN 6-12 |
| 5 | 393-01131-0 | * NIPPLE 5.5-5 |
| 6 | 916129-0675 | * BOLT |
| 7 | 916129-0650 | * BOLT |
| 8 | 916129-0630 | * BOLT |
| 10 | 910124-0880 | * BOLT |
| 11 | 940121-0800 | * WASHER |
| 13 | 3K9B01001-0 | CYLINDER HEAD ASSY |
| 14 | 350-01093-0 | * WELCH PLUG |
| 15 | 3B2-01005-2 | CYLINDER HEAD GASKET |
| 16 | 9161G9-0630 | BOLT |
| 17 | 940121-0600 | WASHER |
| 18 | 350-01030-2 | THERMOSTAT |
| 19 | 3B2B02300-0 | EXHAUST COVER ASSY |
| 20 | 3K9B02302-0 | EXHAUST COVER (INNER) |
| 21 | 3K9-02305-2 | EXHAUST COVER GASKET |
| 22 | 916114-0625 | BOLT |
| 23 | 3PR-06972-0 | CLAMP 6.5-47.5P |
| 24 | 3B2-01214-2 | CRANKCASE HEAD GASKET |
| 25 | 393-01160-0 | CHECK VALVE |
| 26 | 98AL-40-120 | HOSE |
| 27 | 98AL-40-230 | HOSE |
| 28 | 3T5-01133-0 | CLIP φ8 |
| 29 | 338-01133-0 | CLIP φ7 |
| 30 | 3B2-01210-0 | CRANKCASE HEAD |
| 31 | 3B2-01215-0 | OIL SEAL 12.1-28-5 |
| 32 | 3B2-00122-1 | OIL SEAL 20-40-7 |
| 33 | 3B2-01217-0 | SPACER 22-27.5-1 |
| 34 | 910103-5620 | BOLT |
| 35 | 3B2-01303-3 | ENGINE BASEMENT GASKET |
| 36 | 9701-1-1014 | SPARK PLUG (BPR7HS-10) |
▶Fig.02 PISTON・CRANK SHAFT (20 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2-00069-0 | CRANKSHAFT SUB-ASSY |
| 2 | 3B2-00040-0 | * CONNECTING ROD |
| 3 | 3B2-00043-0 | * ROLLER BEARING 17-23-14 |
| 4 | 3B2-00031-0 | * CRANKSHAFT A |
| 5 | 3B2-00032-0 | * CRANKSHAFT B |
| 6 | 3B2-00033-0 | * CRANKSHAFT C |
| 7 | 3B2-00034-0 | * CRANKSHAFT D |
| 8 | 3B2-00061-2 | * CRANK PIN |
| 9 | 350-00062-0 | * SEALING PLUG |
| 10 | 3B2-00051-0 | * OIL SEAL 25-47-7 |
| 11 | 369-00115-0 | * THRUST PLATE |
| 13 | 9603-3-6204 | BALL BEARING 6204 |
| 14 | 338-00042-0 | ROLLER BEARING 14-18-19 |
| 15 | 101-00121-0 | OIL SEAL 20-35-7 |
| 16 | 3B2-87131-0 | PISTON REPAIR KIT (0.5 O/S) |
| 17 | 3B2-00004-1 | * PISTON (0.5 O/S) |
| 18 | 3B2-00021-1 | * PISTON PIN |
| 19 | 350-00024-1 | * PISTON PIN CLIP |
| 20 | 3G0-87124-0 | PISTON RING SET (0.5 O/S) |
| 21 | 3B2-00014-0 | * PISTON RING (0.5 O/S) |
▶Fig.03 INTAKE MANIFOLD・REED VALVE・THROTTLE (21 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2B02010-0 | INTAKE MANIFOLD ASSY |
| 2 | 3B2-02104-1 | INTAKE MANIFOLD GASKET |
| 3 | 3B2-02105-1 | INTAKE MANIFOLD GASKET |
| 4 | 3B2-02100-0 | REED VALVE ASSY |
| 5 | 3B2-02411-0 | INTAKE SILENCER |
| 7 | 3B2-02416-0 | SPACER |
| 8 | 3C8-66308-0 | WASHER 6-16-1.5 |
| 9 | 941303-0600 | SPRING WASHER |
| 10 | 916103-0685 | BOLT |
| 12 | 369-02011-0 | CARBURETOR GASKET |
| 13 | 3B2-63711-0 | ADVANCER ARM |
| 14 | 3B2-63611-0 | THROTTLE DRUM |
| 15 | 3B2-63506-1 | HOLDER |
| 16 | 921521-6520 | SCREW |
| 17 | 3B2-63751-0 | THROTTLE ARM |
| 18 | 3B2-63715-2 | ROD 5-45 |
| 19 | 3B7-05243-0 | BALL JOINT CONNECTOR |
| 20 | 930103-0500 | NUT |
| 21 | 345-05224-0 | ROD SNAP 5-2.5 |
| 22 | 3B2-63716-1 | THROTTLE ROD |
| 23 | 346-67196-1 | ROD SNAP 3-B |
▶Fig.04 CARBURETOR・FUEL PUMP (34 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3K9-03200-0 | CARBURETOR ASSY |
| 2 | 3K9-03252-0 | * MAIN NOZZLE |
| 3 | 3K9-03251-0 | * MAIN JET (#95) |
| 4 | 3K9-03254-0 | * SLOW JET (#50) |
| 5 | 346-03256-0 | * RUBBER CAP |
| 6 | 369-03231-0 | * FLOAT |
| 7 | 3R3-03239-0 | * FLOAT VALVE ASSY |
| 8 | 344-03244-0 | * CLIP |
| 9 | 346-03232-0 | * FLOAT ARM PIN |
| 10 | 921521-0408 | * SCREW |
| 11 | 3B2-03221-0 | * FLOAT CHAMBER |
| 12 | 369-03222-0 | * FLOAT CHAMBER O-RING |
| 13 | 922503-6414 | * 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 | 353-03268-0 | * SPRING |
| 20 | 369-03304-0 | * PUMP BODY |
| 21 | 369-03305-0 | * CHECK VALVE |
| 22 | 921522-0306 | * 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 | 346-67196-1 | ROD SNAP 3-B |
▶Fig.05 RECOIL STARTER・STARTER LOCK (33 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2-05000-1 | RECOIL STARTER ASSY |
| 2 | 3B2-05105-0 | * STARTER CASE |
| 3 | 3B2-05010-1 | * STARTER SPRING SET |
| 4 | 3B2-05104-0 | * REEL |
| 5 | 369-05012-0 | * RETURN SPRING |
| 6 | 3B2-05003-1 | * RATCHET |
| 7 | 369-05007-0 | * FRICTION SPRING |
| 8 | 3B2-05138-1 | * BOLT |
| 9 | 3B2-05006-1 | * FRICTION PLATE |
| 10 | 3B2-05013-0 | * STARTER ROPE φ4.5-1620 |
| 11 | 3B2-05019-0 | * STARTER HANDLE |
| 12 | 3B2-05131-1 | * ROPE ANCHOR |
| 13 | 3B2-05116-0 | * SEALING PLATE |
| 14 | 338-05252-0 | * STARTER LOCK |
| 15 | 921503-5430 | * SCREW |
| 16 | 338-05255-0 | * COLLAR 4-6-21 |
| 17 | 338-05216-0 | * STARTER LOCK SPRING |
| 18 | 3B2-05253-0 | * STARTER LOCK CAM |
| 19 | 941403-0800 | * WAVE WASHER d=8 |
| 20 | 921503-7616 | * SCREW |
| 21 | 3M2-05215-0 | * COLLAR 6.1-8-4 |
| 22 | 3B2-05217-1 | STARTER LOCK ROD |
| 23 | 3K9-05223-0 | ROD SNAP 4-2 |
| 24 | 3B2-05901-1 | STARTER PULLEY |
| 25 | 910114-0620 | BOLT |
| 26 | 940103-0600 | WASHER |
| 27 | 3B2B05101-0 | BRACKET |
| 28 | 3B2B05102-0 | BRACKET |
| 29 | 910121-6623 | BOLT |
| 30 | 910121-6612 | BOLT |
| 31 | 3PR-06972-0 | CLAMP 6.5-47.5P |
| 32 | 314-72185-0 | CAUTION DECAL |
| 33 | 3F0-72185-0 | CAUTION DECAL |
▶Fig.06 MAGNETO・ELECTRIC PARTS (49 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2-06101-0 | FLYWHEEL ASSY |
| 2 | 3B2-06194-1 | FLYWHEEL ASSY W/GEAR |
| 3 | 3B2-06103-3 | COIL PLATE ASSY W/ALTERNATOR |
| 4 | 3B2-06102-2 | * COIL PLATE ASSY |
| 5 | 3B2-06120-0 | ** EXCITER COIL |
| 7 | 3B2-06135-0 | ** HOLDER |
| 8 | 921521-6406 | ** SCREW |
| 9 | 3B2-06123-1 | * ALTERNATOR ASSY (80W) |
| 10 | 921521-6625 | * SCREW |
| 11 | 3B2-63724-0 | SETTING PLATE |
| 12 | 921621-0612 | SCREW |
| 13 | 3K9-05233-0 | COIL PLATE STOPPER |
| 14 | 921503-6510 | SCREW |
| 17 | 346-05228-1 | BALL JOINT |
| 18 | 3K9-06170-0 | CD UNIT ASSY |
| 19 | 3KM-06999-0 | * PLUG CAP W/RESISTANCE |
| 20 | 3B2-06162-0 | SPACER 6.2-9-27 |
| 21 | 910114-0620 | BOLT |
| 22 | 910114-0645 | BOLT |
| 24 | 338-00131-0 | KEY 16-5.7-4 |
| 25 | 369-00132-0 | NUT 12-P1.25 |
| 26 | 940121-1200 | WASHER |
| 27 | 31H-76010-0 | STARTER MOTOR ASSY |
| 28 | 31H-76015-0 | * PINION ASSY |
| 31 | 31H-75014-0 | * BRUSH HOLDER ASSY |
| 31a | 940103-0600 | ** WASHER |
| 31b | 941303-0600 | ** SPRING WASHER |
| 31c | 930203-0600 | ** NUT |
| 32 | 916103-0830 | BOLT |
| 33 | 941303-0800 | SPRING WASHER |
| 34 | 350-76011-0 | STARTER MOTOR BRACKET |
| 35 | 398-06972-1 | CLAMP 6.5-67P |
| 36 | 3PR-06972-0 | CLAMP 6.5-47.5P |
| 37 | 910103-5610 | BOLT |
| 38 | 910103-5825 | BOLT |
| 40 | 345-06917-1 | CLAMP 9-20U |
| 41 | 346-76040-0 | STARTER SOLENOID |
| 42 | 910103-6620 | BOLT |
| 43 | 930103-0600 | NUT |
| 44 | 3B2-76060-0 | RECTIFIER COMPLETE |
| 45 | 921503-0525 | SCREW |
| 46 | 941303-0500 | SPRING WASHER |
| 47 | 930103-0500 | NUT |
| 48 | 3B2-76120-1 | BATTERY CABLE L=2000 |
| 49 | 3B2-76147-2 | STARTER CABLE L=200 |
| 50 | 3A3-76145-0 | TERMINAL CAP 8-13-28 |
| 51 | 3AA-76145-0 | TERMINAL CAP 13-13-28 |
| 52 | 3B2-76062-0 | FUSE WIRE ASSY L=355 |
| 53 | 346-76212-0 | * FUSE 15A |
▶Fig.07 DRIVE SHAFT HOUSING (10 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2Q61192-1 | DRIVE SHAFT HOUSING (L) |
| 2 | 3B2-61018-0 | BOLT 35mm |
| 3 | 3B2-61012-2 | DRIVE SHAFT HOUSING GASKET |
| 4 | 3B2-01111-0 | DOWEL PIN 6-16 |
| 5 | 369-66043-1 | GROMMET 10.7-3.5 |
| 11 | 3B2-02311-0 | EXHAUST PIPE |
| 12 | 3B2-02312-2 | EXHAUST PIPE GASKET |
| 13 | 910103-5618 | BOLT |
| 14 | 910103-5612 | BOLT |
| 15 | 9401E3-0600 | WASHER |
▶Fig.08 GEAR CASE (60 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2Q60000-2 | GEAR CASE ASSY |
| 2 | 3B2-60211-0 | * ROLLER BEARING 15-21-16 |
| 3 | 9601-0-6204 | BALL BEARING 6204 |
| 4 | 9161E3-0635 | BOLT |
| 5 | 9401E3-0600 | WASHER |
| 6 | 332-60005-3 | PLUG 8-8 |
| 7 | 332-60006-1 | GASKET |
| 8 | 3V1-60217-0 | TRIM TAB |
| 9 | 910103-5620 | BOLT |
| 10 | 3AA-60206-0 | WATER STRAINER W=17 |
| 11 | 921503-0430 | SCREW |
| 12 | 930403-0400 | NYLON NUT 4-P0.7 |
| 13 | 3B2Q60100-1 | PROPELLER SHAFT HOUSING ASSY |
| 14 | 345-65015-0 | * O-RING 3.2-47 |
| 15 | 369-60111-0 | * OIL SEAL 15-28-10 |
| 16 | 9601-0-6004 | * BALL BEARING 6004 |
| 17 | 9101E3-5620 | BOLT |
| 18 | 3B2-64010-1 | BEVEL GEAR ASSY (A) |
| 19 | 3B2-64020-1 | BEVEL GEAR B |
| 20 | 3B2-64030-1 | BEVEL GEAR C |
| 21 | 369-64032-0 | WASHER 15.2-19-1.9 |
| 22 | 369-64015-0 | SHIM 21-28-0.15 |
| 23 | 3V1-64211-1 | PROPELLER SHAFT |
| 24 | 3B2-64215-0 | CLUTCH |
| 25 | 301-64217-0 | PIN 3.5-28 |
| 26 | 3V1-64221-0 | SPRING |
| 27 | 369-64223-0 | PUSH ROD |
| 28 | 3B2-64222-0 | SPRING RETAINER |
| 29 | 3B2-65021-1 | WATER PUMP IMPELLER |
| 30 | 3B2-65022-0 | KEY φ3-11 |
| 31 | 3B2-65016-0 | PUMP CASE (UPPER) |
| 32 | 3B2-65011-0 | PUMP CASE LINER |
| 33 | 331-65014-0 | WATER PIPE SEAL (LOWER) |
| 34 | 3B2-65018-2 | PUMP CASE GASKET |
| 35 | 3B2-65025-0 | WATER PUMP GUIDE PLATE |
| 36 | 3B2-65029-2 | GUIDE PLATE GASKET |
| 37 | 9161E3-0650 | BOLT |
| 38 | 940103-0600 | WASHER |
| 39 | 3V1-65017-0 | PUMP CASE (LOWER) |
| 40 | 309-60111-0 | OIL SEAL 12-24-8 |
| 41 | 3B2-65020-1 | PUMP CASE GASKET (LOWER) |
| 42 | 3B2-64083-0 | SHIM 28-36.8-0.3 |
| 43 | 3B2-64307-1 | DRIVE SHAFT ASSY (L) |
| 44 | 9601-0-6301 | * BALL BEARING 6301 |
| 45 | 369-66011-0 | CLUTCH CAM |
| 46 | 951403-0310 | SPRING PIN 3-10 |
| 47 | 3B2-66013-0 | CAM ROD (L) |
| 48 | 3UA-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 | 910103-5625 | BOLT |
| 53 | 3B2-65110-0 | WATER PIPE (L) |
| 54 | 3B2-65195-0 | GROMMET 14-2 |
| 55 | 3B2B64519-1 | PROPELLER ASSY (9.5") |
| 56 | 3UA-87326-0 | PROPELLER HARDWARE KIT |
| 57 | 3UA-64231-0 | * THRUST HOLDER 4D |
| 58 | 369-64124-0 | * WASHER 10.5-28-2 |
| 59 | 369-64121-0 | * PROPELLER NUT |
| 60 | 951503-0318 | * SPLIT PIN 3-18 |
▶Fig.09 BRACKET・REVERSE LOCK (51 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3V1Q62112-2 | CLAMP BRACKET (R) |
| 2 | 3V1Q62113-2 | CLAMP BRACKET (L) |
| 3 | 309-62115-2 | BOLT 8-122 |
| 4 | 930403-0800 | NYLON NUT 8-P1.25 |
| 5 | 9401E3-0800 | WASHER |
| 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 | 3B2Q62310-1 | SWIVEL BRACKET |
| 15 | 344-67177-1 | GREASE FITTING |
| 16 | 345-62441-0 | FRICTION PIECE |
| 17 | 346-62421-1 | FRICTION SPRING |
| 18 | 9101E3-0830 | BOLT |
| 19 | 3B2-66322-1 | REVERSE LOCK |
| 20 | 3B2-66321-1 | REVERSE LOCK ROD |
| 22 | 3B2-66315-0 | REVERSE LOCK SPRING |
| 23 | 3B2-66305-0 | REVERSE LOCK LINK |
| 24 | 345-05224-0 | ROD SNAP 5-2.5 |
| 25 | 3B2-66302-0 | REVERSE LOCK LINK JOINT |
| 26 | 951503-0214 | SPLIT PIN |
| 27 | 3B2Q62010-0 | STEERING SHAFT ASSY |
| 28 | 3B2-62422-0 | THRUST PLATE (UPPER) 22-44-2 |
| 29 | 3B2-62415-0 | O-RING 4.25-19.5 |
| 30 | 3G0-62417-0 | BUSHING |
| 31 | 3B2-61301-0 | RUBBER MOUNT (UPPER) |
| 32 | 3B2-61337-0 | DAMPER (UPPER) |
| 33 | 3B2-61336-0 | DAMPER (LOWER) |
| 34 | 3B2-61302-0 | RUBBER MOUNT (LOWER) |
| 35 | 3K9Q61401-0 | MOUNT BRACKET (R) |
| 36 | 3K9Q61402-0 | MOUNT BRACKET (L) |
| 37 | 9101E3-5640 | BOLT |
| 38 | 3A3-62396-1 | GROUND L=110 |
| 39 | 910103-5612 | BOLT |
| 40 | 3B2-62396-0 | GROUND L=165 |
| 41 | 3V1-62431-1 | TILT STOPPER ASSY |
| 42 | 3AS-62433-0 | * TILT STOPPER GRIP |
| 43 | 393-62437-1 | BUSHING |
| 44 | 369-62439-1 | SETTING PLATE |
| 45 | 9101E3-5612 | BOLT |
| 46 | 3V1Q62105-2 | CLAMP SCREW KIT |
| 47 | 3V1Q62108-1 | * CLAMP SCREW ASSY |
| 48 | 3M3-62106-0 | ** CLAMP SCREW |
| 49 | 3RSQ62102-0 | ** CLAMP SCREW HANDLE |
| 50 | 951403-0622 | ** SPRING PIN |
| 51 | 332-62101-1 | * CLAMP SCREW PAD |
| 52 | 945303-0500 | * E-RING d=5 |
▶Fig.10 TILLER HANDLE (MF・EF MODEL) (21 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2Q63003-3 | TILLER HANDLE ASSY |
| 2 | 3B2Q63005-3 | * TILLER HANDLE SUB-ASSY |
| 3 | 3B2Q63011-1 | ** TILLER HANDLE |
| 4 | 350-63012-2 | ** GRIP |
| 5 | 3B2-63041-0 | ** THROTTLE SHAFT |
| 6 | 345-63048-0 | ** THROTTLE SHAFT DAMPER |
| 7 | 350-63046-0 | ** BUSHING 8.4-10-11 |
| 8 | 920803-0518 | ** SCREW |
| 9 | 3B2-63035-1 | ** FRICTION PIECE |
| 10 | 3B2-63034-0 | ** ADJUSTING SCREW M6-16 |
| 13 | 369-72019-2 | ** THROTTLE DECAL |
| 14 | 3B2-63104-1 | ** STUD |
| 15 | 3B2-63063-0 | ** THROTTLE SHAFT SUPPORT |
| 16 | 9215E3-0612 | ** SCREW |
| 17 | 3B2-63102-0 | * BUSHING |
| 18 | 3B2-63600-1 | * THROTTLE WIRE |
| 19 | 3B2-63108-0 | * WASHER 30-45-1 |
| 20 | 3B2-63109-0 | * WAVE WASHER 30-45-1.2 |
| 21 | 3B2-63103-0 | * STEERING HANDLE STOPPER |
| 22 | 940103-0600 | * WASHER |
| 23 | 930103-0600 | * NUT |
▶Fig.11 BOTTOM COWL (32 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2-67151-1 | CHOKE ROD |
| 2 | 3B2Q67100-1 | BOTTOM COWL |
| 3 | 369-02230-1 | FUEL FILTER ASSY |
| 4 | 98AB-50-075 | HOSE |
| 5 | 3B2-02212-0 | FUEL HOSE |
| 6 | 345-76023-0 | GROMMET 22-2.5 |
| 7 | 338-02215-0 | CLIP φ10 |
| 7a | 3GT-35143-0 | CLIP φ9.4 |
| 8 | 369-67104-0 | CHOKE ROD BUSHING |
| 9 | 3B2-70260-1 | FUEL CONNECTOR (MALE) |
| 10 | 332-70261-0 | NUT 10-P1.25 |
| 11 | 336-70112-0 | GASKET 10.2-16-0.5 |
| 12 | 398-76080-1 | NEUTRAL SWITCH |
| 13 | 398-76083-0 | NEUTRAL SWITCH ACTUATOR |
| 14 | 3B7-63731-0 | WASHER 12.5-24-1 |
| 15 | 398-06830-0 | STOP SWITCH ASSY |
| 16 | 31H-06848-0 | * STOP SWITCH LANYARD ASSY |
| 17 | 3B2-76026-1 | MAIN SWITCH ASSY |
| 18 | 9101E3-5620 | BOLT |
| 19 | 369Q67141-1 | HOOK LEVER |
| 20 | 338-67147-0 | SEAL RING 13.8-22-3.7 |
| 21 | 369-67105-0 | HOOK LEVER BUSHING |
| 22 | 3C8-67146-0 | WASHER 14-22-1 |
| 23 | 941403-1400 | WAVE WASHER d=14 |
| 24 | 369-67142-0 | COVER HOOK |
| 25 | 910103-6612 | BOLT |
| 26 | 3C8-66308-0 | WASHER 6-16-1.5 |
| 27 | 3B2-63621-0 | GROMMET 19.8-2 |
| 29 | 353-67162-0 | GROMMET 41-14-3 |
| 30 | 3B2-67187-0 | GROMMET 16-17.5 |
| 31 | 345-66226-0 | GROMMET 17-3 |
| 32 | 369-72026-1 | SPARK PLUG DECAL (BPR7HS10) |
▶Fig.12 SHIFT (15 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2-66211-0 | SHIFT ROD |
| 2 | 3B2-66241-0 | SHIFT ROD JOINT |
| 3 | 951403-0310 | SPRING PIN 3-10 |
| 4 | 3B2-66110-0 | SHIFT LEVER |
| 5 | 3K9-66137-0 | OIL SEAL 14-20-4.5 |
| 6 | 3B2-05211-1 | STARTER LOCK ARM |
| 7 | 350-67101-0 | BUSHING |
| 8 | 3B2-66225-0 | SHIFT ROD LEVER |
| 9 | 951703-0800 | SNAP RETAINER d=8 |
| 10 | 3C8-66113-1 | SHIFT DETENT SPRING |
| 11 | 910114-0610 | BOLT |
| 12 | 940103-0600 | WASHER |
| 13 | 3C8-66117-0 | SHIFT DETENT SUPPORTER |
| 14 | 3K9-05223-0 | ROD SNAP 4-2 |
| 15 | 945303-1000 | E-RING d=10 |
▶Fig.13 REMOTE CONTROL (26 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 3 | 3B2-83880-3 | REMOTE CONTROL FITTING ASSY |
| 4 | 3A1-83722-0 | * BALL JOINT HOLDER |
| 5 | 332-83723-0 | * HOLDER CAP |
| 6 | 332-83724-0 | * SPRING |
| 7 | 332-83725-0 | * WASHER 5.5-14-1.2 |
| 8 | 3B2-83820-0 | * CABLE CLIP ASSY |
| 9 | 910103-6616 | * BOLT |
| 10 | 930103-0600 | * NUT |
| 11 | 369-83830-2 | * STEERING HOOK PLATE |
| 12 | 910103-5830 | * BOLT |
| 13 | 930103-0800 | * NUT |
| 14 | 941303-0800 | * SPRING WASHER |
| 15 | 940103-0800 | * WASHER |
| 16 | 369-83726-0 | * THROTTLE LEVER |
| 17 | 369-67105-0 | * HOOK LEVER BUSHING |
| 18 | 338-67147-0 | * SEAL RING 13.8-22-3.7 |
| 19 | 941403-1400 | * WAVE WASHER d=14 |
| 20 | 3B2-83887-1 | * THROTTLE LEVER |
| 21 | 910103-6612 | * BOLT |
| 22 | 3C8-66308-0 | * WASHER 6-16-1.5 |
| 23 | 3B2-83863-1 | * THROTTLE LEVER ROD |
| 24 | 3B2-83865-0 | * NUT 10-32UNF |
| 25 | 345-05224-0 | * ROD SNAP 5-2.5 |
| 26 | 3A1-83710-1 | * CABLE JOINT ASSY |
| 30 | 3K9-83857-0 | REMOTE CONTROL STOP CORD ASSY L=5900 |
| 31 | 345-66226-0 | * GROMMET 17-3 |
▶Fig.14 TOP COWL (11 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2Q67645-9 | TOP COWL ASSY |
| 2 | 3B2Q67640-1 | * TOP COWL SUB-ASSY |
| 3 | 3B2-67501-1 | ** TOP COWL SEAL L=1700 |
| 4 | 3B2-67503-0 | ** STARTER SEAL |
| 5 | 3B2Q67521-1 | ** TILT HANDLE |
| 6 | 930403-0600 | ** NYLON NUT 6-P1.0 |
| 7 | 940103-0600 | ** WASHER |
| 9 | 3K9-87801-3 | * DECAL SET (M9.8B) |
| 10 | 3F0-72185-0 | CAUTION DECAL |
| 11 | 3AC-72200-0 | STOP SWITCH DECAL |
| 12 | 3VS-67587-0 | START DECAL |
▶Fig.15 FUEL TANK (18 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B7-70200-5 | 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-70250-1 | * FUEL CONNECTOR |
| 11 | 332-70201-0 | * CLAMP |
| 12 | 3RS-70167-0 | FUEL TANK ASSY 12L |
| 13 | 3RS-70020-0 | * FUEL TANK CAP ASSY |
| 13a | 3RS-70021-0 | ** TANK FILLER CAP GASKET |
| 14 | 3E0-70270-0 | * QUICK-CONNECTOR (MALE) |
| 15 | 3B2-70155-1 | * PICK-UP ELBOW ASSY (12L) |
| 16 | 3C7-70199-0 | ** O-RING |
| 17 | 3C7-70113-0 | ** FILTER |
▶Fig.16 COMPONENT PARTS OF REMOTE CONTROL (55 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3U2B84350-1 | REMOTE CONTROL HEAD ASSY (RC12C) |
| 2 | 3U2B84360-1 | REMOTE CONTROL HEAD ASSY (RC12D) |
| 3 | 3U2-84416-0 | * GROMMET |
| 4 | 353-84321-0 | * GROMMET |
| 5 | 3A3-84365-1 | * THROTTLE ARM |
| 6 | 945303-0600 | * E-RING d=6 |
| 7 | 3U2-84414-0 | * GROMMET |
| 8 | 3A3-84381-0 | * SHIFT GEAR ASSY |
| 9 | 3A3-83314-2 | * CABLE TERMINAL |
| 10 | 3A3-84364-2 | * DRIVE GEAR |
| 11 | 930103-0500 | * NUT |
| 12 | 910103-0525 | * BOLT |
| 13 | 3A3-84376-0 | * GROMMET |
| 14 | 3U2B84441-0 | * REAR HOUSING |
| 15 | 3U2B84366-0 | * REAR PANEL |
| 16 | 3U2-84401-0 | * NEUTRAL LOCK ARM |
| 17 | 3A3-84403-0 | * NEUTRAL LOCK SPRING |
| 18 | 3U2-84404-0 | * GRIP |
| 19 | 3U2-84343-0 | * CONTROL LEVER |
| 20 | 3A3-84368-0 | * WAVE WASHER |
| 21 | 3A3-84391-0 | * FREE THROTTLE DRUM |
| 22 | 3A3-84435-0 | * BUSHING |
| 23 | 3A3-84422-0 | * THRUST PLATE |
| 24 | 3U2-84452-0 | * TILT SWITCH PLUG |
| 25 | 921603-0512 | * SCREW |
| 26 | 3U2-84339-1 | * INSTRUCTION DECAL |
| 27 | 3A3-84432-0 | * BUSHING |
| 28 | 3U2-84375-0 | * SCREW |
| 29 | 3VK-84375-0 | * SCREW |
| 30 | 3VL-84375-0 | * SCREW |
| 31 | 3A3-84374-0 | * SPACER |
| 32 | 353-84371-0 | * WASHER |
| 33 | 3U2-84371-0 | * WASHER |
| 34 | 930103-0600 | * NUT |
| 35 | 3A3-84383-0 | * WASHER |
| 36 | 3A3-84421-0 | * ROLLER |
| 37 | 3U2-84431-0 | * BUSHING |
| 38 | 940103-0800 | * WASHER |
| 39 | 3U2-84442-0 | * BOLT |
| 40 | 353-84388-0 | * DETENT ROLLER |
| 41 | 3U2B84312-0 | * FREE THROTTLE LEVER |
| 42 | 921503-0406 | * SCREW |
| 43 | 3A3-84423-0 | * DETENT RETAINER |
| 44 | 3A3-84307-0 | * DETENT SPRING |
| 45 | 3A3-84424-0 | * FREE THROTTLE ROLLER |
| 46 | 3A3-84426-0 | * ROLLER RETAINER |
| 47 | 3A3-84425-0 | * FREE THROTTLE SPRING |
| 48 | 3VK-63107-0 | * COVER |
| 49 | 3U2-63506-0 | * HOLDER |
| 50 | 3U2-84917-0 | * BOLT |
| 51 | 3U2-77367-0 | * JOINT |
| 52 | 3U2-72187-0 | * CAUTION DECAL (SIGP) |
| 53 | 3U2B84440-0 | * FRONT HOUSING |
| 54 | 369-84418-0 | * GROMMET |
| 55 | 361-84415-0 | * GROMMET |
▶Fig.17 COMPONENT PARTS OF REMOTE CONTROL (ELECTRIC PARTS) (14 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3U2-84331-0 | DECAL (LEVER) |
| 2 | 3U2-84336-1 | SHIFT POSITION DECAL |
| 3 | 3U2-84398-0 | BAND |
| 4 | 3A3-06830-0 | STOP SWITCH ASSY |
| 5 | 31H-06848-0 | * STOP SWITCH LANYARD ASSY |
| 6 | 3U2-72200-0 | STOP SWITCH DECAL |
| 7 | 3U2-84334-0 | REMOTE CONTROL LOGO DECAL |
| 8 | 3GF-76020-0 | MAIN SWITCH ASSY |
| 9 | 3GF-76219-0 | * MAIN SWITCH KEY |
| 10 | 3GF-76205-0 | * MAIN SWITCH KEY COVERING CAP |
| 11 | 361-76110-1 | CORD ASSY |
| 12 | 3A3-76086-1 | NEUTRAL SWITCH (REMOTE CONT) |
| 13 | 921503-5316 | SCREW |
| 14 | 3A3-76037-0 | CABLE TERMINAL PLUG |
▶Fig.18 OPTIONAL PARTS (ACCESSORIES) (13 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 312-72201-0 | SAFETY ROPE φ4-1000 |
| 2 | 369-72100-1 | TOOL KIT |
| 3 | 346-76160-2 | RECTIFIER KIT |
| 4 | 3B2-06128-0 | ALTERNATOR KIT |
| 5 | 921521-6625 | * SCREW |
| 6 | 369-76167-0 | EXTENSION CORD (LIGHT) L=2000 |
| 16 | 3B2B05180-0 | VERTICAL STARTER KIT |
| 17 | 3B2B05911-0 | * VERTICAL STARTER GUIDE |
| 18 | 9101F4-0654 | * BOLT |
| 19 | 940103-0600 | * WASHER |
| 20 | 930103-0600 | * NUT |
| 21 | 3B2-05912-0 | * SEAL |
| 23 | 336-60007-0 | FLUSHING PLUG |
▶Fig.19 ASSEMBLY・KIT PARTS (11 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3B2Q87302-8 | LOWER UNIT ASSY (L) |
| 2 | 3K9B87090-A | ENGINE SHORT BLOCK KIT |
| 3 | 922553-6423 | * SCREW |
| 4 | 3K9-87121-6 | POWER HEAD GASKET SET |
| 5 | 3B2Q63003-3 | * TILLER HANDLE ASSY |
| 6 | 940103-0600 | * WASHER |
| 7 | 3B2-65239-0 | * WATER PUMP GUIDE PLATE |
| 8 | 3B2-87321-5 | LOWER UNIT GASKET SET |
| 9 | 9101E3-5635 | * BOLT |
| 10 | 3B7-63731-0 | * WASHER 12.5-24-1 |
| 11 | 951403-0312 | * SPRING PIN 3-12 |
100-Hour / Annual Service Checklist
Regular maintenance keeps your Tohatsu M8/9.8B running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.
- Replace water pump impeller and inspect wear plate
- Inspect and clean carburetor(s); check fuel mixture settings
- Replace spark plugs and check ignition timing
- Drain and refill lower unit gear oil; inspect for water contamination
- Inspect fuel lines, primer bulb, and fuel filter for deterioration
- Check and replace sacrificial anodes (zinc or aluminum)
- Inspect propeller for damage; check shaft seal and cotter pin
- Decarbonize exhaust ports and piston crown if needed
- Lubricate all grease points (steering, tilt tube, shift linkage)
- Inspect control cables and throttle/shift linkage for smooth operation
- Pro Tip: Always flush the engine with fresh water after saltwater use — even a quick 10-minute flush significantly extends component life.
- Pro Tip: Use fuel stabilizer in the tank before winter storage, and fog the cylinders to prevent internal corrosion during extended periods of non-use.
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