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Tohatsu MX25/30H (2015) Parts & Diagrams
🔎 Tohatsu MX25/30H Reference Library — Exploded parts diagrams (17 diagrams), specifications, common issues, and maintenance checklist.
The Tohatsu MX25/30H is a 2-Stroke outboard motor. Commonly used on jon boats, pontoons, and mid-size utility craft.
Quick Reference Specifications
| Specification | Value |
|---|---|
| Engine Type | 2-Stroke |
| Horsepower | 25 HP |
| Displacement | 429 |
| Bore x Stroke | 68 x 59 |
| Spark Plug (Type & Gap) | NGK B7HS-10 |
| Engine Oil Capacity | — |
| Recommended Engine Oil | TC-W3 Certified 2-Stroke Oil |
| Gear Case Oil Capacity | — |
| Idle Speed (in gear) | 800 |
| Full Throttle RPM Range | 5150-5850 |
| 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 MX25/30H:
- 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 MX25/30H.
▶ASSEMBLY・KIT PARTS (10 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 346Q87304-C | LOWER UNIT ASSY (UL) |
| 2 | 3KKJ87090-4 | ENGINE SHORT BLOCK KIT |
| 3 | 922503-6414 | * SCREW |
| 4 | 3A1-87121-5 | POWER HEAD GASKET SET |
| 5 | 951603-0800 | * SNAP PIN d=8 |
| 6 | 9101E3-5652 | * BOLT |
| 7 | 361-65239-0 | * WATER PUMP GUIDE PLATE |
| 8 | 3C8-66032-0 | * O-RING 3.5-21.7 |
| 9 | 9161E3-0845 | * BOLT |
| 12 | 3KK-00090-0 | * NEEDLE ROLLER SET |
▶BOTTOM COWL (37 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 346Q67100-3 | BOTTOM COWL |
| 2 | 346-67113-0 | MOUNT 8.5-14-2.5 |
| 3 | 346-67114-1 | SPACER 6.2-9-15.7 |
| 4 | 338Q67141-0 | HOOK LEVER |
| 5 | 338-67147-0 | SEAL RING 13.8-22-3.7 |
| 6 | 350-67105-0 | HOOK LEVER BUSHING 14-16.5-17.7 |
| 7 | 3C8-67146-0 | WASHER 14-22-1 |
| 8 | 941403-1400 | WAVE WASHER d=14 |
| 9 | 345-67142-1 | COVER HOOK |
| 10 | 910103-0612 | BOLT |
| 11 | 3C8-66308-0 | WASHER 6-16-1.5 |
| 12 | 346-67151-1 | CHOKE ROD |
| 13 | 951503-0212 | SPLIT PIN 2-12 |
| 14 | 346-67152-0 | CHOKE LEVER |
| 15 | 346-67153-0 | CHOKE LEVER BRACKET |
| 16 | 910103-6612 | BOLT |
| 17 | 910103-0614 | BOLT |
| 18 | 941403-0600 | WAVE WASHER d=6 |
| 19 | 930403-0600 | NYLON NUT 6-P1.0 |
| 20 | 346-67104-0 | CHOKE ROD BUSHING |
| 21 | 345-67161-0 | GROMMET 22-3 |
| 22 | 346-67165-0 | GROMMET 68-20-2.8 |
| 23 | 353-67162-0 | GROMMET 41-14-3 |
| 24 | 346-67161-0 | GROMMET |
| 25 | 3BA-01138-0 | NIPPLE 6.8-3-10 |
| 26 | 398-06830-0 | STOP SWITCH ASSY |
| 27 | 353-06821-0 | * STOP SWITCH LANYARD ASSY |
| 28 | 336-06973-0 | CLAMP 6-9.5L |
| 29 | 921503-5612 | SCREW |
| 30 | 9101E3-0630 | BOLT |
| 31 | 346-67115-0 | WASHER 6.5-21-1 |
| 32 | 910121-0612 | BOLT |
| 33 | 346-63061-2 | THROTTLE SHAFT |
| 34 | 345-63063-0 | THROTTLE SHAFT SUPPORT |
| 35 | 910103-0630 | BOLT |
| 36 | 940103-0600 | WASHER |
| 37 | 332-72025-0 | SPARK PLUG DECAL (B7HS10) |
▶BRACKET (74 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3AEQ62112-2 | CLAMP BRACKET (R) |
| 2 | 3AEQ62113-2 | CLAMP BRACKET (L) |
| 3 | 3AC-62191-0 | SWIVEL BRACKET SHAFT ASSY |
| 4 | 346-62127-0 | CAP NUT |
| 5 | 349-62126-0 | BUSHING |
| 6 | 346-62124-1 | NYLON NUT 7/8-14 |
| 7 | 346-62117-1 | DISTANCE PIECE |
| 8 | 930103-0600 | NUT |
| 10 | 9401E3-0600 | WASHER |
| 11 | 345-62121-1 | THRUST ROD |
| 12 | 345-62122-2 | THRUST ROD SPRING |
| 13 | 349Q62310-3 | SWIVEL BRACKET |
| 14 | 346Q62010-1 | STEERING SHAFT ASSY |
| 15 | 346-62412-1 | * WASHER 22.6-30-2 |
| 16 | 945103-2200 | * C-RING d=22 |
| 17 | 345-62417-0 | BUSHING 26-32 |
| 18 | 345-62441-0 | FRICTION PIECE |
| 19 | 346-62421-1 | FRICTION SPRING |
| 20 | 9101E3-0830 | BOLT |
| 21 | 3A0-62423-2 | THRUST PLATE (UPPER) 27-50-1 |
| 22 | 346-62424-1 | THRUST PLATE (LOWER) 26.5-46-1 |
| 23 | 3H8-62415-0 | O-RING 3.5-25.7 |
| 24 | 945103-2500 | C-RING d=25 |
| 26 | 344-67177-1 | GREASE FITTING |
| 27 | 346-61323-0 | LOCK PLATE |
| 28 | 346-61302-1 | RUBBER MOUNT (LOWER) |
| 29 | 346-61301-1 | RUBBER MOUNT (UPPER) |
| 30 | 346-61307-2 | BOLT |
| 31 | 346Q61411-2 | MOUNT BRACKET |
| 32 | 9401E3-1000 | WASHER |
| 33 | 346-61321-2 | BOLT |
| 34 | 345-61322-2 | WASHER 10.1-18-2.5 |
| 35 | 346-61336-0 | DAMPER (LOWER) |
| 36 | 346-61333-0 | DAMPER (UPPER) |
| 37 | 346-61334-0 | WASHER 21-35.7-3 |
| 38 | 346-61335-0 | LOCK PLATE 20-31.7-3 |
| 39 | 346-61312-1 | RUBBER MOUNT RETAINER |
| 41 | 930103-1000 | NUT 10-P1.5 |
| 42 | 398-62396-1 | GROUND L=130 |
| 44 | 3B7-60218-1 | ANODE |
| 45 | 910103-5630 | BOLT |
| 46 | 346-61337-0 | DAMPER (UPPER) |
| 47 | 349Q62993-2 | TILT STOPPER |
| 48 | 951403-0640 | SPRING PIN |
| 49 | 346-62437-0 | BUSHING 10.2-12-29.5 |
| 50 | 346-62439-1 | SETTING PLATE |
| 51 | 9101E3-5820 | BOLT |
| 52 | 3C8-62421-1 | FRICTION SPRING |
| 53 | 346-62438-0 | SETTING PIECE |
| 55 | 3A3-62396-1 | GROUND L=110 |
| 56 | 910103-5612 | BOLT |
| 57 | 346-66322-0 | REVERSE LOCK |
| 58 | 349-66313-0 | REVERSE LOCK ARM |
| 59 | 336-66319-1 | PIVOT BOLT |
| 61 | 346-66321-0 | REVERSE LOCK ROD |
| 62 | 951503-0212 | SPLIT PIN 2-12 |
| 63 | 3P0-66311-0 | REVERSE LOCK LEVER |
| 64 | 940103-0800 | WASHER |
| 65 | 3AL-05254-0 | SHOULDER BOLT 6-8 |
| 66 | 3AL-05212-0 | BUSHING 8.1-20 |
| 67 | 3AA-83719-0 | WASHER 8.5-18-1.6 |
| 68 | 3R0-66308-0 | WASHER 6-16-1.5 |
| 69 | 349-66312-0 | REVERSE LOCK LINK |
| 70 | 346-66323-1 | REVERSE LOCK LEVER SPRING |
| 71 | 3R0-66332-0 | REVERSE LOCK SPRING (L) |
| 72 | 3AL-66333-0 | REVERSE LOCK LEVER GRIP |
| 73 | 346-66334-0 | STOPPER |
| 77 | 3AAQ62105-0 | CLAMP SCREW KIT |
| 78 | 3AAQ62108-0 | * CLAMP SCREW ASSY |
| 79 | 3AA-62106-0 | ** CLAMP SCREW |
| 80 | 332Q62102-1 | ** CLAMP SCREW HANDLE |
| 81 | 3C8-62104-2 | ** RIVET 3-22 |
| 82 | 332-62101-1 | * CLAMP SCREW PAD |
| 83 | 3C8-62107-0 | * SHOULDER BOLT |
▶CARBURETOR (24 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3KK-03200-0 | CARBURETOR ASSY |
| 2 | 353-03221-0 | * FLOAT CHAMBER |
| 3 | 922503-6414 | * SCREW |
| 4 | 346-03222-0 | * FLOAT CHAMBER O-RING |
| 5 | 346-03231-0 | * FLOAT |
| 6 | 346-03232-0 | * FLOAT ARM PIN |
| 7 | 3B7-03240-0 | * FLOAT VALVE |
| 8 | 334-03242-0 | * VALVE PIN |
| 9 | 344-03244-0 | * CLIP |
| 10 | 3F3-03234-0 | * SCREW |
| 11 | 3A1-03252-0 | * MAIN NOZZLE |
| 12 | 3C7-03251-0 | * MAIN JET (#162) |
| 13 | 346-03174-0 | * THROTTLE LEVER COLLAR |
| 14 | 346-03272-0 | * THROTTLE LEVER |
| 15 | 930131-0500 | * NUT |
| 16 | 941332-0500 | * SPRING WASHER |
| 17 | 3KK-04588-0 | * SLOW JET (#88) |
| 18 | 346-03256-0 | * RUBBER CAP |
| 19 | 346-03265-0 | * STOP SCREW |
| 20 | 346-03267-0 | * SPRING |
| 21 | 346-03266-0 | * PILOT SCREW |
| 22 | 346-03268-0 | * SPRING |
| 23 | 345-03292-0 | * DRAIN SCREW |
| 24 | 336-03293-0 | * O-RING |
▶CYLINDER・CRANK CASE (79 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3KLJ01100-0 | CYL BLOCK & CRANKCASE ASSY |
| 2 | 393-01131-0 | * NIPPLE 5.5-5 |
| 3 | 393-01137-0 | * NIPPLE 5-4-5 |
| 4 | 346-01137-0 | * NIPPLE 7-7 |
| 5 | 336-01111-0 | * DOWEL PIN 8.7-11.5-12.7 |
| 6 | 3KM-01312-0 | * BOLT |
| 7 | 3LD-01012-0 | * CYLINDER HEAD BOLT |
| 9 | 3KKJ01001-0 | CYLINDER HEAD ASSY |
| 10 | 350-01093-0 | * WELCH PLUG |
| 11 | 3P0-01143-0 | ANODE PLUG |
| 12 | 3T5-10046-0 | O-RING 1.9-13 |
| 13 | 3P0-60218-0 | ANODE |
| 14 | 921503-0530 | SCREW |
| 15 | 346-01005-2 | CYLINDER HEAD GASKET |
| 16 | 3KK-01012-0 | CYLINDER HEAD BOLT |
| 17 | 3KK-01015-1 | WASHER |
| 18 | 345-01030-0 | THERMOSTAT |
| 19 | 3H6J01031-0 | THERMOSTAT CAP |
| 20 | 346-01032-0 | THERMOSTAT CAP GASKET |
| 21 | 910103-5630 | BOLT |
| 22 | 3B7-76142-1 | GROUND CABLE L=120 |
| 23 | 346J02301-0 | EXHAUST COVER (OUTER) |
| 24 | 346-02305-2 | EXHAUST COVER GASKET |
| 25 | 9101E3-5518 | BOLT |
| 26 | 98AB-50-250 | HOSE φ5-φ10 |
| 27 | 9701-1-1005 | SPARK PLUG (B7HS10) |
| 28 | 3LC-01160-0 | CHECK VALVE |
| 30 | 98AL-40-030 | HOSE |
| 31 | 98AL-40-185 | HOSE |
| 33 | 3T5-01133-0 | CLIP φ8 |
| 34 | 338-01133-0 | CLIP φ7 |
| 35 | 3T5-84398-0 | BAND 104 |
| 36 | 346-01210-0 | CRANKCASE HEAD |
| 37 | 346-01215-0 | OIL SEAL 16-28-6 |
| 38 | 346-01216-0 | O-RING 1.7-59 |
| 39 | 9101F4-0616 | BOLT |
| 40 | 941303-0600 | SPRING WASHER |
| 41 | 346J05101-1 | BRACKET |
| 42 | 3KM-61111-0 | STUD |
| 44 | 940103-0800 | WASHER |
| 45 | 346-05211-2 | STARTER LOCK ARM |
| 47 | 346-05212-0 | BUSHING 6.2-16-7 |
| 48 | 921503-0620 | SCREW |
| 50 | 346-05213-1 | THROTTLE LIMITER ARM |
| 52 | 940103-0600 | WASHER |
| 53 | 346-05222-0 | STARTER LOCK ROD |
| 54 | 345-05224-0 | ROD SNAP 5-2.5 |
| 55 | 345-05223-1 | ROD SNAP 3.5-2 |
| 56 | 346-05221-1 | THROTTLE LIMITER ROD 5-27L |
| 62 | 3P0-63701-1 | ADVANCER ARM ASSY |
| 63 | 3KK-63104-0 | STUD |
| 64 | 345-63713-0 | BUSHING 8-14-4 |
| 65 | 930403-0800 | NYLON NUT 8-P1.25 |
| 66 | 334-66233-0 | WASHER 8.1-16-1.5 |
| 67 | 921503-0525 | SCREW |
| 69 | 350-63717-1 | ROD L=50 |
| 70 | 3B7-05243-0 | BALL JOINT CONNECTOR |
| 72 | 3KK-63718-0 | THROTTLE CAM |
| 73 | 921503-0616 | SCREW |
| 74 | 346-63721-0 | BUSHING 6.2-16-5 |
| 75 | 3C8-66308-0 | WASHER 6-16-1.5 |
| 76 | 941403-1000 | WAVE WASHER d=10 |
| 77 | 346-63716-1 | THROTTLE ROD |
| 78 | 3P0-05223-0 | ROD SNAP 3.5-2 |
| 79 | 348-63715-1 | ROD 5-75L |
| 80 | 346-05234-0 | ROD JOINT φ5 |
| 81 | 930103-0500 | NUT |
| 82 | 3B7-63733-0 | ROD SNAP 5-2.5 |
| 83 | 353-83728-1 | PIN |
| 84 | 930103-0600 | NUT |
| 85 | 3AA-83719-0 | WASHER 8.5-18-1.6 |
| 86 | 951603-0800 | SNAP PIN d=8 |
| 87 | 309-06972-0 | CLAMP 6.5-47.5P |
| 88 | 921521-0610 | SCREW |
| 89 | 345-06917-1 | CLAMP 9-20U |
| 90 | 3KM-05138-0 | BOLT |
| 91 | 930103-0800 | NUT |
| 92 | 398-06972-0 | CLAMP 6.5-67P |
| 93 | 346-01303-1 | ENGINE BASEMENT GASKET |
▶DRIVE SHAFT HOUSING (9 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 346Q61192-3 | DRIVE SHAFT HOUSING (L) |
| 2 | 346-67116-0 | ENGINE BASEMENT SEAL L=630 |
| 3 | 9101E3-5840 | BOLT |
| 4 | 9106E3-0808 | BOLT |
| 5 | 332-60006-0 | GASKET 8.1-15-1 |
| 6 | 345-01111-0 | DOWEL PIN 6-12 |
| 7 | 346Q61110-5 | EXTENSION HOUSING |
| 8 | 9161E3-0835 | BOLT |
| 9 | 346-66226-0 | GROMMET 17-5.5 |
▶FUEL TANK (17 parts)
| 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 | 3C7-70177-1 | FUEL TANK ASSY 25L |
| 13 | 3C7-70050-1 | * FUEL GAUGE VENT CAP ASSY (25L) |
| 14 | 3C7-70155-0 | * PICK-UP ELBOW ASSY (25L) |
| 15 | 3E0-70270-0 | * QUICK-CONNECTOR (MALE) |
| 16 | 3C7-70199-0 | * O-RING |
| 17 | 3C7-70113-0 | * FILTER |
▶GEAR CASE (DRIVE SHAFT) (50 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 9161E3-0845 | BOLT |
| 2 | 3P0-66233-0 | WASHER 8.1-16-1.5 |
| 3 | 3AEQ60000-2 | GEAR CASE ASSY |
| 4 | 3AE-60211-0 | * ROLLER BEARING 20-27-30 |
| 5 | 346-64084-0 | SHIM 35-41.9-0.5 |
| 6 | 332-60005-2 | PLUG 8-8 |
| 7 | 332-60006-0 | GASKET 8.1-15-1 |
| 8 | 3C8-60217-1 | TRIM TAB |
| 9 | 910103-5620 | BOLT |
| 10 | 346-64020-1 | BEVEL GEAR B |
| 11 | 346-64027-1 | NUT |
| 12 | 346-64327-0 | DRIVE SHAFT SPRING |
| 13 | 346-64328-0 | DRIVE SHAFT SPRING GUIDE |
| 14 | 346-64303-5 | DRIVE SHAFT (UL) |
| 15 | 346-60213-0 | TAPERED ROLLER BEARING 32004 |
| 16 | 369-60206-0 | WATER STRAINER |
| 17 | 9218E3-0620 | SCREW |
| 18 | 345-65021-0 | WATER PUMP IMPELLER |
| 19 | 332-65022-0 | KEY 20-4.6-2 |
| 20 | 348-65016-1 | PUMP CASE (UPPER) |
| 21 | 348-65011-0 | PUMP CASE LINER |
| 22 | 3B7-65014-0 | WATER PIPE SEAL (LOWER) |
| 23 | 346-65017-2 | PUMP CASE (LOWER) |
| 24 | 346-65013-0 | OIL SEAL 17-30-9 |
| 25 | 348-65029-1 | GUIDE PLATE GASKET |
| 26 | 348-65018-0 | PUMP CASE GASKET |
| 27 | 334-65012-0 | DOWEL PIN 4-10 |
| 28 | 336-62415-0 | O-RING 3.5-36 |
| 29 | 348-65025-0 | WATER PUMP GUIDE PLATE |
| 30 | 9101E3-5652 | BOLT |
| 31 | 346-66014-1 | CAM ROD (UL) |
| 32 | 3C8-66011-0 | CLUTCH CAM |
| 33 | 951407-0312 | SPRING PIN 3-12 |
| 34 | 3C8-66031-1 | CAM ROD BUSHING |
| 35 | 332-66021-0 | O-RING 2.4-5.8 |
| 36 | 3C8-66032-0 | O-RING 3.5-21.7 |
| 37 | 910103-6612 | BOLT |
| 38 | 3C8-66308-0 | WASHER 6-16-1.5 |
| 39 | 346-66037-0 | CAM ROD HOLDER |
| 40 | 346-66241-1 | SHIFT ROD JOINT |
| 42 | 346-65120-0 | WATER PIPE (UL) |
| 43 | 346-65203-0 | LOCK PLATE |
| 44 | 910103-0610 | BOLT |
| 45 | 346-65206-0 | WATER PIPE SEAL (UPPER) |
| 46 | 346-65204-0 | WATER PIPE AUXILIARY MOUNT |
| 47 | 951403-0312 | SPRING PIN 3-12 |
| 48 | 346-60984-0 | SUB-WATER INLET HOSE PLUG |
| 49 | 3A1-60235-0 | WATER STRAINER SET |
| 50 | 930403-0400 | * NYLON NUT 4-P0.7 |
| 51 | 9215E3-0430 | * SCREW |
▶GEAR CASE (PROPELLER SHAFT) (26 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 346-60215-0 | TAPERED ROLLER BEARING 30205 |
| 2 | 349Q60100-7 | PROPELLER SHAFT HOUSING ASSY |
| 3 | 346Q60101-8 | * PROPELLER SHAFT HOUSING |
| 4 | 346-60102-0 | * ROLLER BEARING 18-25-2.5 |
| 5 | 9601-0-6205 | * BALL BEARING 6205 |
| 6 | 332-60103-0 | * O-RING 3-62.5 |
| 7 | 3AC-60111-0 | * OIL SEAL 18-28-8 |
| 8 | 9101E3-5830 | BOLT |
| 9 | 346-64010-1 | BEVEL GEAR ASSY (A) |
| 10 | 369-64082-1 | SHIM 26.5-34.8-0.15 |
| 11 | 346-64030-0 | BEVEL GEAR C |
| 12 | 346-64032-0 | WASHER 18-24-1.5 |
| 13 | 346-64211-6 | PROPELLER SHAFT |
| 14 | 332-64221-0 | SPRING |
| 15 | 350-64222-1 | SPRING RETAINER |
| 16 | 346-64215-1 | CLUTCH |
| 17 | 346-64218-0 | PIN |
| 18 | 346-64219-0 | SNAP |
| 19 | 3C8-64223-1 | PUSH ROD |
| 20 | 965002-0803 | BALL 3/8 |
| 21 | 3R0B64527-0 | PROPELLER ASSY (13") |
| 22 | 3R0-87326-0 | PROPELLER HARDWARE KIT |
| 23 | 346-64231-5 | * THRUST HOLDER |
| 24 | 346-64124-5 | * WASHER 12.5-32-2.5 |
| 25 | 346-64121-5 | * PROPELLER NUT |
| 26 | 951503-0322 | * SPLIT PIN 3-22 |
▶INTAKE MANIFOLD・FUEL PUMP (37 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3KLJ02010-0 | INTAKE MANIFOLD ASSY |
| 2 | 915303-0618 | * STUD BOLT |
| 3 | 910103-6625 | BOLT |
| 4 | 346-02100-2 | REED VALVE ASSY |
| 5 | 921521-7616 | SCREW |
| 6 | 930103-0600 | NUT |
| 7 | 941303-0600 | SPRING WASHER |
| 8 | 346-02011-1 | CARBURETOR GASKET |
| 9 | 3P1-03536-0 | RESTRICTOR |
| 10 | 356-04000-1 | FUEL PUMP ASSY |
| 11 | 334-04004-0 | * PUMP COVER |
| 12 | 9225F2-6528 | * SCREW |
| 13 | 334-04005-0 | * PUMP DIAPHRAGM |
| 14 | 334-04007-0 | * DIAPHRAGM GASKET |
| 15 | 356-04030-0 | * DIAPHRAGM GASKET SET |
| 16 | 356-04044-0 | * CHECK VALVE |
| 17 | 921722-0306 | * SCREW |
| 18 | 930222-0300 | * NUT |
| 19 | 346-04901-2 | GASKET |
| 20 | 910103-6640 | BOLT |
| 21 | 3AD-02230-0 | FUEL FILTER ASSY |
| 22 | 3AD-02237-0 | * CUP |
| 23 | 3AD-02235-0 | * O-RING |
| 24 | 3AD-02234-0 | * FILTER |
| 25 | 930103-0800 | NUT |
| 26 | 334-66233-0 | WASHER 8.1-16-1.5 |
| 27 | 98AB-50-160 | HOSE |
| 28 | 98AB-50-230 | HOSE |
| 30 | 346-02411-1 | INTAKE SILENCER |
| 31 | 910103-5614 | BOLT |
| 32 | 346-67191-1 | CHOKE ROD |
| 33 | 346-67196-1 | ROD SNAP 3-B |
| 34 | 3B2-70260-1 | FUEL CONNECTOR (MALE) |
| 35 | 332-70261-0 | NUT 10-P1.25 |
| 36 | 336-70112-0 | GASKET 10.2-16-0.5 |
| 37 | 98AB-50-110 | HOSE |
| 38 | 338-02215-0 | CLIP φ10 |
▶MAGNETO (41 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 345-01401-0 | MAGNETO BASEMENT |
| 2 | 126-00121-0 | OIL SEAL 30-45-8 |
| 3 | 338-01403-0 | O-RING 2-55.5 |
| 4 | 910121-6620 | BOLT |
| 5 | 3P0-06091-1 | FLYWHEEL W/GEAR |
| 7 | 3LD-06102-0 | COIL PLATE ASSY |
| 10 | 3G3-06021-1 | * EXCITER COIL |
| 11 | 921521-6525 | * SCREW |
| 12 | 350-06025-0 | * HOLDER |
| 14 | 921521-6406 | * SCREW |
| 18 | 346-63722-2 | GUIDE PLATE |
| 19 | 353-63723-1 | SETTING RING |
| 20 | 921503-6510 | SCREW |
| 21 | 346-05228-1 | BALL JOINT |
| 22 | 3P0-06060-0 | CD UNIT |
| 23 | 910103-6620 | BOLT |
| 26 | 3KK-06049-1 | IGNITION COIL ASSY W/LABEL |
| 27 | 3LD-06921-0 | * PLUG CAP |
| 28 | 3M2-06926-0 | * PLUG CAP TERMINAL |
| 29 | 3T5-84398-0 | * BAND 104 |
| 31 | 3Y9-06157-0 | * PROTECTOR L=100 |
| 32 | 3P0-06157-0 | * PROTECTOR L=220 |
| 33 | 3C8-72181-0 | * CAUTION DECAL (B) |
| 34 | 910103-5625 | BOLT |
| 35 | 941303-0600 | SPRING WASHER |
| 36 | 930103-0600 | NUT |
| 37 | 3A0-06322-1 | PLATE |
| 38 | 910103-6625 | BOLT |
| 39 | 3C8-66308-0 | WASHER 6-16-1.5 |
| 40 | 3T4-06972-1 | CLAMP 6.5-87P |
| 41 | 3B7-06305-0 | RUBBER MOUNT 9-16-4.3 |
| 42 | 3A0-76079-0 | COLLAR 6.2-9-7.4 |
| 43 | 3F3-06920-0 | RUBBER MOUNT 8.5-12-2 |
| 44 | 921503-5510 | SCREW |
| 45 | 3P0-06915-0 | CLAMP 6.5-11L |
| 46 | 336-76091-0 | LEAD WIRE BAND 100 |
| 47 | 334-00131-0 | KEY 19-7-5 |
| 48 | 931121-1600 | NUT |
| 49 | 334-00133-0 | WASHER 17-30-1.6 |
| 50 | 3C7-76142-1 | GROUND CABLE L=170 |
| 51 | 910103-0612 | BOLT |
▶OPTIONAL PARTS (ACCESSORIES) (1) (3 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3C8-72100-1 | TOOL KIT |
| 3 | 336-60007-0 | FLUSHING PLUG |
| 4 | 3P0-66901-0 | REVERSE LOCK SHIFT LEVER KIT |
▶PISTON・CRANK SHAFT (26 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 3KK-00069-1 | CRANKSHAFT SUB-ASSY |
| 2 | 3P1-00031-0 | * CRANKSHAFT A |
| 3 | 346-00032-0 | * CRANKSHAFT B |
| 4 | 346-00033-0 | * CRANKSHAFT C |
| 5 | 346-00034-0 | * CRANKSHAFT D |
| 6 | 334-00061-1 | * CRANK PIN |
| 8 | 346-00051-1 | * LABYRINTH PACKING |
| 9 | 951407-0308 | * SPRING PIN 3-8 |
| 10 | 3KK-00041-0 | * CONNECTING ROD |
| 11 | 356-00043-0 | * ROLLER BEARING 20-28-18 |
| 12 | 3KM-00113-0 | MAIN BEARING 5206 |
| 13 | 3J2-00114-0 | MAIN BEARING 6305 |
| 14 | 332-00143-0 | SHIM |
| 15 | 346-00116-0 | SPACER 25.2-34-1.6 |
| 16 | 945107-2500 | C-RING d=25 |
| 18 | 3KK-00046-0 | SMALL END BEARING WASHER |
| 19 | 346-00115-0 | THRUST PLATE |
| 20 | 346-00122-0 | OIL SEAL 24-40-8 |
| 23 | 3E3-87124-0 | PISTON RING SET (0.5 O/S) |
| 24 | 356-00014-0 | * PISTON RING (0.5 O/S) |
| 25 | 346-00014-0 | * PISTON RING (0.5 O/S) |
| 30 | 3KL-87131-0 | PISTON REPAIR KIT (0.5 O/S) |
| 31 | 3KK-00004-0 | * PISTON (0.5 O/S) |
| 32 | 3LC-00021-0 | * PISTON PIN |
| 33 | 3LC-00024-0 | * PISTON PIN CLIP |
| 34 | 3KK-00090-0 | NEEDLE ROLLER SET |
▶RECOIL STARTER (39 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 346-05000-4 | RECOIL STARTER ASSY |
| 2 | 345-05105-1 | * STARTER CASE |
| 3 | 345-05104-1 | * REEL ASSY |
| 4 | 345-05003-1 | * RATCHET |
| 5 | 345-05135-1 | * BUSHING 14.7-15.9-6 |
| 6 | 345-05122-1 | * WASHER 6.5-23-1.5 |
| 7 | 945303-0500 | * E-RING d=5 |
| 8 | 345-05123-1 | * RETURN SPRING |
| 9 | 345-05124-0 | * RETURN SPRING |
| 10 | 345-05004-1 | * STARTER SPRING |
| 11 | 951403-0316 | * SPRING PIN 3-16 |
| 12 | 345-05132-0 | * STARTER SHAFT |
| 13 | 9101F4-0830 | * BOLT |
| 14 | 941322-0800 | * SPRING WASHER |
| 15 | 940121-0800 | * WASHER |
| 16 | 930103-0800 | * NUT |
| 17 | 336-05014-0 | * ROPE GUIDE |
| 20 | 338-05019-0 | * STARTER HANDLE |
| 21 | 345-05013-1 | * STARTER ROPE φ5-2000 |
| 22 | 338-05131-0 | * ROPE ANCHOR |
| 23 | 350-05136-0 | * O-RING 2.5-4.5 |
| 24 | 345-05134-0 | * ROPE ANCHOR PLATE |
| 25 | 346-05116-1 | * SEALING PLATE |
| 26 | 345-05225-1 | * STARTER LOCK LEVER SHAFT |
| 27 | 3KM-67503-0 | STARTER SEAL |
| 28 | 3KK-05138-0 | BOLT |
| 29 | 941303-0800 | SPRING WASHER |
| 30 | 3LD-02319-0 | BOLT |
| 31 | 941303-0600 | SPRING WASHER |
| 32 | 345-05901-1 | STARTER PULLEY |
| 33 | 910121-6625 | BOLT |
| 34 | 945303-0600 | E-RING d=6 |
| 35 | 345-05226-0 | STARTER LOCK LEVER |
| 36 | 345-05216-0 | STARTER LOCK SPRING |
| 37 | 940103-0400 | WASHER |
| 38 | 3P0-05218-0 | STARTER LOCK ROD ASSY |
| 39 | 346-05209-0 | CAP NUT |
| 40 | 345-06915-0 | CLAMP 6.5-14L |
| 41 | 3C7-72182-2 | CAUTION DECAL (C) |
▶SHIFT (15 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 11 | 346-66211-1 | SHIFT ROD |
| 12 | 346Q66110-2 | SHIFT LEVER |
| 14 | 346-66138-0 | SPACER 18.2-26-3 |
| 15 | 345-66137-0 | OIL SEAL 10-20-4 |
| 16 | 346-66121-0 | SHIFT LEVER STOPPER |
| 17 | 910903-6512 | BOLT |
| 18 | 345-66115-0 | SHIFT LEVER STOP HOLDER |
| 19 | 965002-1605 | BALL 5/16 |
| 20 | 332-66112-0 | SPRING |
| 21 | 910103-0616 | BOLT |
| 22 | 940103-0600 | WASHER |
| 23 | 346-67101-0 | BUSHING 10-12.8-28.5 |
| 24 | 346-66225-1 | SHIFT ROD LEVER |
| 25 | 930403-1000 | NYLON NUT 10-P1.5 |
| 26 | 345-66119-0 | SHIM t=0.2 |
▶TILLER HANDLE (25 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 1 | 398Q63003-2 | TILLER HANDLE ASSY |
| 2 | 3M3Q63005-1 | * TILLER HANDLE SUB-ASSY |
| 3 | 398Q63011-1 | ** TILLER HANDLE |
| 4 | 398-63012-0 | ** GRIP |
| 5 | 398-63041-0 | ** THROTTLE SHAFT |
| 6 | 345-63048-0 | ** THROTTLE SHAFT DAMPER |
| 8 | 941403-1000 | ** WAVE WASHER d=10 |
| 9 | 921803-0525 | ** SCREW |
| 10 | 951403-0310 | ** SPRING PIN 3-10 |
| 11 | 3V1-63035-1 | ** FRICTION PIECE |
| 12 | 3V1-63077-0 | ** ADJUSTING NUT |
| 13 | 3V1-63036-0 | ** SPRING |
| 14 | 910103-0625 | ** BOLT |
| 15 | 9101E3-5675 | ** BOLT |
| 16 | 930403-0600 | ** NYLON NUT 6-P1.0 |
| 17 | 398-63053-0 | ** SPACER |
| 18 | 369-72019-1 | ** THROTTLE DECAL |
| 19 | 346-63201-3 | * BOLT 9.7-11-12-8.5 |
| 20 | 345-63207-0 | * COLLAR 9.8-12.7-7.5 |
| 21 | 350-63046-0 | BUSHING 8.4-10-11 |
| 22 | 346-63064-0 | UNIVERSAL PINION |
| 23 | 951403-0414 | SPRING PIN 4-14 |
| 24 | 346-63066-1 | COLLAR 15.9-17-9 |
| 25 | 940103-0800 | WASHER |
| 26 | 345-66226-0 | GROMMET 17-3 |
▶TOP COWL (8 parts)
| Ref | OEM Part # | Part Name |
|---|---|---|
| 2 | 3C7-72180-3 | CAUTION DECAL (A) |
| 3 | 3KKH67645-0 | TOP COWL ASSY (SERVICE) |
| 4 | 3KMH67640-0 | * TOP COWL SUB-ASSY |
| 5 | 3KM-67501-0 | ** TOP COWL SEAL |
| 6 | 3KMH67521-0 | ** TILT HANDLE |
| 7 | 930403-0600 | ** NYLON NUT 6-P1.0 |
| 8 | 3C8-66308-0 | ** WASHER 6-16-1.5 |
| 9 | 3KL-87801-0 | * DECAL SET (MX25H) |
100-Hour / Annual Service Checklist
Regular maintenance keeps your Tohatsu MX25/30H 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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