Customer Service: info@jlm-marine.com
Free shipping. No Minimum Purchase
🔎 Tohatsu M2.5/3.5A2/3.5B2 Reference Library — Exploded parts diagrams (13 diagrams), specifications, common issues, and maintenance checklist.
The Tohatsu M2.5/3.5A2/3.5B2 is a 2-Stroke outboard motor. Designed for dinghies, inflatable boats, and small tenders where lightweight portability is essential.
| Specification | Value |
|---|---|
| Engine Type | 2-Stroke |
| Horsepower | 2 HP |
| Displacement | 74.6 |
| Bore x Stroke | 47 x 43 |
| Spark Plug (Type & Gap) | NGK BPR6HS-10 |
| Engine Oil Capacity | — |
| Recommended Engine Oil | TC-W3 Certified 2-Stroke Oil |
| Gear Case Oil Capacity | 90 mL |
| Idle Speed (in gear) | 1100 |
| Full Throttle RPM Range | 4200-5300 |
| Fuel | Unleaded Gasoline, 87 Octane min. |
Always verify specifications against your owner's manual for your specific serial number range.
Below are common maintenance scenarios for the Tohatsu M2.5/3.5A2/3.5B2:
Expand the sections below to view detailed exploded parts diagrams and find the exact OEM replacement components for your Tohatsu M2.5/3.5A2/3.5B2.
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3F0B01100-1 | CYL BLOCK & CRANKCASE ASSY |
| 2 | 393-01131-0 | * NIPPLE 5.5-5 |
| 3 | 345-01111-0 | * DOWEL PIN 6-12 |
| 4 | 916124-0665 | * BOLT |
| 5 | 910124-0630 | * BOLT |
| 6 | 309B01001-2 | CYLINDER HEAD |
| 7 | 309-01005-2 | CYLINDER HEAD GASKET |
| 8 | 9161F4-0630 | BOLT |
| 9 | 940121-0600 | WASHER |
| 10 | 309-02111-0 | REED VALVE |
| 11 | 309-02113-0 | REED VALVE STOPPER |
| 12 | 921521-7412 | SCREW |
| 13 | 9701-1-1013 | SPARK PLUG(BPR6HS-10) |
| 14 | 98AB-30-150 | HOSE |
| 15 | 3F0-01214-0 | CRANKCASE HEAD GASKET |
| 16 | 3F0-01210-1 | CRANKCASE HEAD |
| 17 | 3F0-01215-0 | OIL SEAL 10.1-20-7 |
| 18 | 309-01210-1 | CRANKCASE HEAD |
| 19 | 910103-5618 | BOLT |
| 20 | 3PR-06972-0 | CLAMP 6.5-47.5P |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 309-00106-0 | THRUST PLATE |
| 2 | 3F0-00107-0 | THRUST PLATE |
| 3 | 309-00121-0 | OIL SEAL 20-42-8 |
| 4 | 309-00122-0 | OIL SEAL 15-35-15 |
| 5 | 3F0-00122-0 | OIL SEAL 17-40-8 |
| 6 | 309-00069-0 | CRANKSHAFT SUB-ASSY |
| 7 | 3F0-00069-0 | CRANKSHAFT SUB-ASSY |
| 8 | 309-00040-0 | * CONNECTING ROD |
| 9 | 309-00043-0 | * ROLLER BEARING 16-22-12 |
| 10 | 309-00031-0 | * CRANKSHAFT A |
| 11 | 309-00034-0 | * CRANKSHAFT D |
| 12 | 3F0-00034-0 | * CRANKSHAFT D |
| 13 | 309-00061-1 | * CRANK PIN |
| 14 | 3F0-00113-0 | MAIN BEARING 6004 |
| 15 | 9643-3-6203 | BALL BEARING 6203 |
| 16 | 309-00042-0 | ROLLER BEARING 10.5-14-15 |
| 17 | 302-00014-0 | PISTON RING (0.5 O/S) |
| 18 | 309-87131-0 | PISTON REPAIR KIT (0.5 O/S) |
| 19 | 309-00004-1 | * PISTON (0.5 O/S) |
| 20 | 309-00021-1 | * PISTON PIN |
| 21 | 309-00024-1 | * PISTON PIN CLIP |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3F0-03100-4 | CARBURETOR ASSY |
| 2 | 309-03170-0 | * THROTTLE WIRE ASSY |
| 3 | 309-03178-0 | * SCREW |
| 4 | 309-03173-0 | * THROTTLE LEVER HOLDER |
| 5 | 309-03101-0 | * CARBURETOR BODY CAP |
| 6 | 309-03107-0 | * THROTTLE VALVE SPRING |
| 7 | 309-03108-0 | * SPRING RECEIVER |
| 8 | 309-03154-0 | * JET NEEDLE CLIP |
| 9 | 3F0-03153-3 | * JET NEEDLE (#256) |
| 10 | 3D5-03106-0 | * THROTTLE VALVE |
| 11 | 309-03155-2 | * NEEDLE JET |
| 12 | 309-03121-0 | * FLOAT CHAMBER GASKET |
| 13 | 309-03125-0 | * FLOAT |
| 14 | 309-03120-0 | * FLOAT CHAMBER |
| 15 | 309-03192-0 | * DRAIN SCREW |
| 16 | 309-03193-0 | * GASKET |
| 17 | 309-03151-3 | * MAIN JET (#86) |
| 18 | 309-03126-0 | * FLOAT ARM PIN |
| 19 | 309-03127-1 | * FLOAT HINGE |
| 20 | 309-03147-1 | * FLOAT VALVE |
| 21 | 309-03148-1 | * NEEDLE VALVE SEAT |
| 22 | 309-03156-0 | * ADJUST SCREW |
| 23 | 309-03157-0 | * SPRING |
| 24 | 309-03161-0 | * CHOKE PLATE |
| 25 | 332-03104-0 | * CHOKE PLATE NUT |
| 26 | 941303-0600 | * SPRING WASHER |
| 27 | 309-03163-0 | * SHUTTER BOLT |
| 28 | 309-03164-0 | * SHUTTER LEVER |
| 29 | 309-03113-0 | * CARBURETOR BODY BAND |
| 30 | 309-03114-0 | * CARBURETOR BODY BAND BOLT |
| 31 | 921532-6410 | * SCREW |
| 32 | 921532-0510 | * SCREW |
| 33 | 309-03177-0 | * THROTTLE LEVER WASHER |
| 34 | 309-03175-0 | * THROTTLE LEVER GASKET |
| 35 | 309-03176-1 | * THROTTLE LEVER END |
| 36 | 309-03174-1 | * THROTTLE LEVER COLLAR |
| 37 | 309-03172-1 | * THROTTLE LEVER |
| 38 | 309-03116-2 | * O-RING 2.4-15.7 |
| 39 | 309-03401-0 | KNOB |
| 40 | 921603-0305 | SCREW |
| 41 | 3F0B02496-2 | CARBURETOR COVER W/DECAL |
| 42 | 921603-0435 | SCREW |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 312-05000-0 | RECOIL STARTER ASSY |
| 2 | 312-05001-0 | * STARTER CASE |
| 3 | 307-05004-0 | * STARTER SPRING |
| 4 | 307-05104-0 | * REEL |
| 5 | 307-05003-0 | * RATCHET |
| 6 | 307-05007-0 | * FRICTION SPRING |
| 7 | 307-05021-0 | * SPRING COVER |
| 8 | 307-05012-0 | * RETURN SPRING |
| 9 | 307-05006-0 | * FRICTION PLATE |
| 10 | 307-05027-0 | * THRUST WASHER |
| 11 | 307-05011-0 | * E-RING |
| 12 | 307-05013-0 | * STARTER ROPE φ4-1250 |
| 13 | 307-05019-0 | * STARTER HANDLE |
| 14 | 309-05028-0 | * PAD |
| 16 | 910121-0612 | BOLT |
| 17 | 309-05901-1 | STARTER PULLEY |
| 18 | 3F0-72185-0 | CAUTION DECAL |
| 19 | 314-72185-0 | CAUTION DECAL |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3F0-06101-0 | FLYWHEEL ASSY |
| 2 | 3F0-06120-0 | EXCITER COIL |
| 3 | 3F0-06915-0 | CLAMP |
| 4 | 309-00132-0 | NUT 10-P1.25 |
| 5 | 921521-6520 | SCREW |
| 6 | 921521-0510 | SCREW |
| 7 | 369-06050-3 | IGNITION COIL W/CAP |
| 9 | 3F0-06157-0 | * PROTECTOR |
| 10 | 3M2-06926-0 | * PLUG CAP TERMINAL |
| 11 | 3M2-06921-0 | * PLUG CAP |
| 12 | 910103-0620 | BOLT |
| 13 | 3F0-06060-0 | CD UNIT |
| 14 | 910103-0616 | BOLT |
| 15 | 3C8-66308-0 | WASHER 6-16-1.5 |
| 16 | 309-00131-0 | KEY |
| 17 | 3D5-06870-0 | STOP SWITCH ASSY |
| 18 | 353-06821-0 | * STOP SWITCH LANYARD ASSY |
| 19 | 3C7-06921-0 | PLUG CAP W/RESISTANCE |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 9101E3-7635 | BOLT |
| 2 | 3F0Q61020-2 | DRIVE SHAFT HOUSING (S) |
| 3 | 345-01111-0 | DOWEL PIN 6-12 |
| 4 | 9101E3-5625 | BOLT |
| 5 | 309-61012-3 | DRIVE SHAFT HOUSING GASKET |
| 6 | 9106E3-0808 | BOLT |
| 7 | 332-60006-0 | GASKET 8.1-15-1 |
| 8 | 369-61016-0 | GROMMET 29-3 |
| 9 | 3F0Q61102-2 | EXTENSION HOUSING ASSY (L) |
| 10 | 369-60003-0 | * DRIVE SHAFT BUSHING |
| 11 | 3F0-61101-1 | STUD 6-171 |
| 13 | 3F0-66214-0 | SHIFT ROD (S) |
| 14 | 951503-0212 | SPLIT PIN 2-12 |
| 15 | 940103-0500 | WASHER |
| 16 | 369-66241-0 | SHIFT ROD JOINT ASSY |
| 17 | 910103-5616 | BOLT |
| 18 | 3F0-66110-0 | SHIFT LEVER |
| 19 | 3G9-66136-0 | O-RING 2-10 |
| 20 | 369-66116-0 | CERAMIC BALL 7.7 |
| 21 | 369-66112-1 | SPRING |
| 22 | 3F0-66225-0 | SHIFT ROD LEVER |
| 23 | 3F0-66227-0 | TAPPING SCREW 4-20 |
| 24 | 940103-0400 | WASHER |
| 25 | 3F0Q66228-0 | COVER |
| 26 | 9101E3-0616 | BOLT |
| 28 | 3F0-66229-1 | GASKET |
| 29 | 309Q63010-0 | TILLER HANDLE ASSY |
| 30 | 309Q63011-0 | * TILLER HANDLE |
| 31 | 309-63012-0 | * GRIP |
| 32 | 910103-0830 | BOLT |
| 33 | 309-63024-0 | TILLER HANDLE DAMPER |
| 34 | 309-63025-0 | SPACER 8.4-12-14.2 |
| 35 | 345-67115-0 | WASHER 6.5-21-1 |
| 36 | 3F0Q67521-0 | CARRYING HANDLE |
| 37 | 9101E3-0625 | BOLT |
| 38 | 9301E3-0600 | NUT |
| 39 | 3GR-76191-0 | HIGH TEMPERATURE CAUTION DECAL |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3ARQ60000-1 | GEAR CASE ASSY |
| 3 | 338-60218-2 | * ANODE |
| 4 | 910103-0616 | * BOLT |
| 5 | 9601-0-6004 | BALL BEARING 6004 |
| 6 | 332-60005-2 | PLUG 8-8 |
| 7 | 332-60006-0 | GASKET 8.1-15-1 |
| 8 | 3F0-64321-0 | SPACER 10.1-15-72 |
| 9 | 3F0Q87323-1 | PROPELLER SHAFT HOUSING ASSY |
| 10 | 3F0Q60101-1 | * PROPELLER SHAFT HOUSING |
| 11 | 9601-0-6001 | * BALL BEARING 6001 |
| 12 | 309-60111-0 | * OIL SEAL 12-24-8 |
| 13 | 345-65015-0 | * O-RING 3.2-47 |
| 14 | 3GR-64010-0 | BEVEL GEAR ASSY (A) |
| 15 | 369-64015-0 | SHIM 21-28-0.15 |
| 16 | 3GR-64020-0 | BEVEL GEAR B |
| 17 | 3F0-64302-0 | DRIVE SHAFT ASSY (L) |
| 18 | 9601-0-6000 | * BALL BEARING 6000 |
| 19 | 369-65021-1 | WATER PUMP IMPELLER |
| 20 | 369-65022-0 | KEY φ2-11 |
| 21 | 3F0-65016-0 | PUMP CASE (UPPER) |
| 22 | 3F0-65011-0 | PUMP CASE LINER |
| 23 | 3F0-65032-0 | GROMMET |
| 24 | 3F0-65018-0 | PUMP CASE GASKET |
| 25 | 3F0-65025-0 | WATER PUMP GUIDE PLATE |
| 26 | 3F0-65029-0 | GUIDE PLATE GASKET |
| 27 | 9161E3-0645 | BOLT |
| 28 | 940103-0600 | WASHER |
| 30 | 3H2-65040-1 | PUMP CASE ASSY (LOWER) |
| 31 | 3F0-60223-0 | * OIL SEAL 10-22-8 |
| 32 | 3F0-65020-0 | PUMP CASE GASKET (LOWER) |
| 33 | 301-66023-0 | O-RING 2.4-9.5 |
| 34 | 3B2-65022-0 | KEY φ3-11 |
| 35 | 3F0-66031-0 | CAM ROD BUSHING |
| 36 | 3F0-64215-0 | CLUTCH |
| 37 | 3F0-64221-0 | SPRING |
| 38 | 3F0-64223-0 | PUSH ROD |
| 39 | 3F0-64211-0 | PROPELLER SHAFT |
| 40 | 3F0-66011-0 | CLUTCH CAM |
| 41 | 3F0-66013-0 | CAM ROD (L) |
| 42 | 951407-0308 | SPRING PIN 3-8 |
| 43 | 369-66021-1 | O-RING 2.5-4.9 |
| 44 | 9101E3-7635 | BOLT |
| 45 | 9101E3-5620 | BOLT |
| 46 | 951503-0435 | SPLIT PIN 4-35 |
| 47 | 309-64126-1 | SHEAR PIN 4-24 |
| 48 | 3F0-65110-0 | WATER PIPE ASSY (L) |
| 49 | 309-65031-1 | * GROMMET 10.6-10.4-4 |
| 50 | 3F0B64512-0 | PROPELLER ASSY (6") |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 309Q60000-2 | GEAR CASE ASSY |
| 2 | 309-64321-1 | * SPACER |
| 4 | 945002-2800 | * C-RING d=28 |
| 5 | 309-64311-1 | DRIVE SHAFT (LOWER) |
| 6 | 9601-0-6300 | BALL BEARING 6300 |
| 7 | 309-64017-0 | SHIM 17.5-10.2-0.05 |
| 8 | 309-64020-0 | BEVEL GEAR B |
| 9 | 945307-0700 | E-RING d=7 |
| 10 | 309-65021-1 | WATER PUMP IMPELLER |
| 11 | 309-65022-0 | KEY φ4-15 |
| 12 | 309Q65010-1 | WATER PUMP CASE |
| 13 | 9601-0-6001 | BALL BEARING 6001 |
| 14 | 309-60111-0 | OIL SEAL 12-24-8 |
| 15 | 309-65015-0 | O-RING 1.5-47.75 |
| 16 | 309-65032-0 | GROMMET 10.2-8 |
| 17 | 309-64210-0 | PROPELLER SHAFT ASSY |
| 18 | 9101E3-7630 | BOLT |
| 19 | 309-60223-0 | OIL SEAL 13-28.1-18 |
| 20 | 309Q60101-1 | WATER PUMP CASE COVER |
| 21 | 309Q61030-2 | DRIVE SHAFT HOUSING (L) |
| 22 | 309-64313-1 | DRIVE SHAFT (UPPER L) |
| 23 | 309-64323-0 | GIRD PIPE |
| 24 | 309-65110-0 | WATER PIPE ASSY (L) |
| 25 | 309Q67521-0 | CARRYING HANDLE |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 309Q62111-4 | CLAMP BRACKET |
| 2 | 309-62115-2 | BOLT 8-122 |
| 3 | 930403-0800 | NYLON NUT 8-P1.25 |
| 4 | 307-62116-1 | WASHER 8.5-28-1 |
| 5 | 309-62117-1 | DISTANCE PIECE |
| 6 | 930103-0600 | NUT |
| 8 | 309-62212-2 | THRUST SUPPORTER |
| 9 | 3F0-62160-0 | THRUST ROD ASSY |
| 10 | 309-62463-0 | KNOB |
| 11 | 309-62464-2 | TILT STOPPER |
| 12 | 309Q62391-1 | SWIVEL BRACKET |
| 13 | 309Q62392-1 | SWIVEL BRACKET |
| 14 | 9101E3-0630 | BOLT |
| 15 | 309-62321-1 | BUSHING |
| 16 | 3GT-62442-0 | FRICTION KNOB |
| 17 | 309-62441-2 | FRICTION PIECE |
| 18 | 309-62446-1 | SPRING |
| 19 | 9401E3-0600 | WASHER |
| 20 | 3GTQ62105-1 | CLAMP SCREW KIT |
| 21 | 3GTQ62108-1 | * CLAMP SCREW ASSY |
| 22 | 369-62106-1 | ** CLAMP SCREW |
| 23 | 3ABQ62102-0 | ** CLAMP SCREW HANDLE |
| 24 | 3C8-62104-2 | ** RIVET 3-22 |
| 25 | 332-62101-1 | * CLAMP SCREW PAD |
| 26 | 3C8-62107-0 | * SHOULDER BOLT |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3F0-87801-8 | DECAL SET (M3.5B2) |
| 2 | 9215E3-0612 | SCREW |
| 3 | 309-67006-0 | TOP COWL JOINT PLATE |
| 4 | 309-67007-0 | NUT |
| 5 | 921603-0510 | SCREW |
| 6 | 309Q06927-1 | COVER |
| 7 | 307-67005-0 | GROMMET 16-5-2.5 |
| 9 | 3F0Q67001-8 | TOP COWL SUB-ASSY (R) |
| 10 | 309Q67002-8 | TOP COWL SUB-ASSY (L) |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3GP-70020-0 | FUEL TANK CAP ASSY |
| 2 | 3GR-70021-0 | * TANK FILLER CAP GASKET |
| 3 | 940103-0400 | * WASHER |
| 4 | 3H9-70095-0 | * HOOK |
| 5 | 951503-1610 | * SPLIT PIN 1.6-10 |
| 6 | 309-70010-3 | FUEL TANK |
| 7 | 309-70015-0 | SPACER 7.2-10-6 |
| 8 | 309-70016-0 | WASHER 6.5-16-2 |
| 9 | 910421-0620 | BOLT |
| 10 | 941322-0600 | SPRING WASHER |
| 11 | 309-70011-0 | FUEL COCK ASSY |
| 12 | 98AB-50-250 | HOSE φ5-φ10 |
| 13 | 338-02215-0 | CLIP φ10 |
| 14 | 309-70036-0 | FUEL TANK SEAL |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 312-72201-0 | SAFETY ROPE φ4-1000 |
| 2 | 312-72100-0 | TOOL KIT |
| 3 | 336-60007-0 | FLUSHING PLUG |
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3ARQ87302-2 | LOWER UNIT ASSY (L) |
| 2 | 309Q87301-1 | LOWER UNIT ASSY (S) |
| 3 | 3F0B87090-5 | ENGINE SHORT BLOCK KIT |
| 4 | 921532-6410 | * SCREW |
| 5 | 3F0-87121-3 | POWER HEAD GASKET SET |
| 6 | 941303-0600 | * SPRING WASHER |
| 7 | 3F0-87321-0 | LOWER UNIT GASKET SET |
| 8 | 951407-0308 | * SPRING PIN 3-8 |
Regular maintenance keeps your Tohatsu M2.5/3.5A2/3.5B2 running reliably season after season. Most of these tasks can be performed with basic tools and the factory service manual.
