🔎 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.
▶Fig.01 CYLINDER・CRANK CASE (79 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3KLJ01100-1 |
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 |
| 9 |
3KKJ01001-0 |
CYLINDER HEAD ASSY |
| 10 |
350-01093-0 |
* WELCH PLUG |
| 10a |
3KM-01142-0 |
ANODE PLUG ASSY |
| 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 |
346-01005-3 |
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(B7HS-10) |
| 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 |
910114-0616 |
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 |
940203-0800 |
WASHER 8.4-15.5-1.6 |
| 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 |
3PR-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 |
398-06972-1 |
CLAMP 6.5-67P |
| 93 |
346-01303-1 |
ENGINE BASEMENT GASKET |
▶Fig.02 PISTON・CRANK SHAFT (26 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3KK-00069-1 |
CRANKSHAFT SUB-ASSY |
| 2 |
3P1-00031-0 |
* CRANKSHAFT A |
| 3 |
3KK-00032-0 |
* CRANKSHAFT B |
| 4 |
3KK-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 t=0.05,0.1,0.2 |
| 15 |
346-00116-0 |
SPACER 25.2-34-1.6 |
| 16 |
945107-2500 |
C-RING d=25 |
| 18 |
3KK-00046-1 |
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 |
▶Fig.03 INTAKE MANIFOLD・FUEL PUMP (37 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3KLJ02010-0 |
INTAKE MANIFOLD ASSY |
| 2 |
3KL-02332-0 |
* 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 |
922512-6530 |
* 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 |
940203-0800 |
WASHER 8.4-15.5-1.6 |
| 27 |
98AB-50-160 |
HOSE |
| 28 |
98AB-50-230 |
HOSE |
| 30 |
346-02411-1 |
INTAKE SILENCER |
| 31 |
910103-5614 |
BOLT |
| 32 |
346-67191-2 |
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 |
▶Fig.04 CARBURETOR (24 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3P0-03200-0 |
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 |
3A1-03251-0 |
* MAIN JET (#155) |
| 13 |
346-03174-0 |
* THROTTLE LEVER COLLAR |
| 14 |
346-03272-0 |
* THROTTLE LEVER |
| 15 |
930131-0500 |
* NUT |
| 16 |
941332-0500 |
* SPRING WASHER |
| 17 |
3A1-03276-0 |
* SLOW JET (#85) |
| 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 |
▶Fig.05 RECOIL STARTER (40 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 |
910114-0830 |
* 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 |
3KK-02319-0 |
BOLT 25mm |
| 31 |
940103-0600 |
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 |
3P0-05218-1 |
STARTER LOCK ROD ASSY |
| 39 |
346-05209-0 |
CAP NUT |
| 40 |
345-06915-0 |
CLAMP 6.5-14L |
| 41 |
3F0-72185-0 |
CAUTION DECAL |
| 42 |
314-72185-0 |
CAUTION DECAL |
▶Fig.06 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 |
| 5a |
3KM-06189-0 |
FLYWHEEL W/RING |
| 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 |
3P0-06060-2 |
CD UNIT |
| 23 |
910103-6620 |
BOLT |
| 26 |
3KK-06050-1 |
IGNITION COIL W/CAP |
| 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 |
| 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 |
| 52 |
346-06999-0 |
PLUG CAP W/RESISTANCE |
▶Fig.08 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 |
332-60006-1 |
GASKET |
| 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 |
▶Fig.09A 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 |
332-60006-1 |
GASKET |
| 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 |
9101E3-5612 |
BOLT |
| 38 |
3R0-66308-0 |
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 |
921503-0430 |
* SCREW |
▶Fig.09B 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 |
346Q60101-9 |
* 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 |
346-64010-2 |
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 |
3R0B64527-1 |
PROPELLER ASSY (13) |
| 22 |
3NV-87326-0 |
PROPELLER HARDWARE KIT |
| 23 |
3NV-64231-0 |
* THRUST HOLDER 4D |
| 24 |
346-64124-5 |
* WASHER 12.5-32-2.5 |
| 25 |
346-64121-5 |
* PROPELLER NUT |
| 26 |
951503-0322 |
* SPLIT PIN 3-22 |
▶Fig.11 BRACKET (75 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3AEQ62112-3 |
CLAMP BRACKET (R) |
| 2 |
3AEQ62113-3 |
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 |
349Q62310-4 |
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 10-83 |
| 31 |
346Q61411-2 |
MOUNT BRACKET |
| 32 |
9401E3-1000 |
WASHER |
| 33 |
346-61321-2 |
BOLT 10-105 |
| 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 |
349Q62993-3 |
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 |
3RSQ62105-1 |
CLAMP SCREW KIT |
| 78 |
3RSQ62108-0 |
* CLAMP SCREW ASSY |
| 79 |
3RS-62106-0 |
** CLAMP SCREW |
| 80 |
3RSQ62102-0 |
** CLAMP SCREW HANDLE |
| 81 |
951403-0622 |
** SPRING PIN |
| 82 |
332-62101-1 |
* CLAMP SCREW PAD |
| 83 |
945303-0500 |
* E-RING d=5 |
| 84 |
3KM-61322-0 |
WASHER |
▶Fig.12 TILLER HANDLE (25 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3NTQ63003-1 |
TILLER HANDLE ASSY |
| 2 |
3NTQ63005-1 |
* TILLER HANDLE SUB-ASSY |
| 3 |
3NTQ63011-0 |
** TILLER HANDLE |
| 4 |
398-63012-0 |
** GRIP |
| 5 |
3LD-63041-0 |
** THROTTLE SHAFT |
| 6 |
345-63048-0 |
** THROTTLE SHAFT DAMPER |
| 8 |
3NT-63046-0 |
** BUSHING |
| 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 |
369-72019-2 |
** THROTTLE DECAL |
| 19 |
346-63201-3 |
* BOLT 9.7-11-12-8.5 |
| 20 |
3NT-63207-0 |
* COLLAR |
| 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 |
▶Fig.13 BOTTOM COWL (36 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3KMQ67100-0 |
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 |
910103-5612 |
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 |
| 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 |
910103-7630 |
BOLT |
| 37 |
332-72025-0 |
SPARK PLUG DECAL (B7HS10) |
| 39 |
3AC-72200-0 |
STOP SWITCH DECAL |
▶Fig.14 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 DETENT |
| 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 |
▶Fig.16 TOP COWL (8 parts)
| Ref |
OEM Part # |
Part Name |
| 3 |
3KKH67645-3 |
TOP COWL ASSY |
| 4 |
3KMH67640-1 |
* TOP COWL SUB-ASSY |
| 5 |
3KL-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-87801-2 |
* DECAL SET (MX25H) |
| 10 |
3F0-72185-0 |
CAUTION DECAL |
▶Fig.17 FUEL TANK (19 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
3B7-70200-5 |
PRIMER BULB ASSY |
| 2 |
3C7-70223-0 |
* JOINT CAP |
| 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 |
3KZ-70177-0 |
FUEL TANK ASSY 25L |
| 13 |
3RS-70020-0 |
* FUEL TANK CAP ASSY |
| 14 |
3RS-70021-0 |
** TANK FILLER CAP GASKET |
| 15 |
3E0-70270-0 |
* QUICK-CONNECTOR (MALE) |
| 16 |
3AC-70157-0 |
* FUEL PICK-UP ASSY W/GAUGE |
| 17 |
3AC-70140-0 |
* SCREW |
| 18 |
3AC-70145-0 |
* WASHER |
| 19 |
3AC-70150-0 |
* GASKET |
▶Fig.20 OPTIONAL PARTS (ACCESSORIES) (1) (8 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 |
| 16 |
3KK-06128-0 |
ALTERNATOR KIT |
| 17 |
3P0-06023-0 |
* ALTERNATOR ASSY |
| 18 |
921521-6528 |
* SCREW |
| 19 |
3G2-06025-1 |
* HOLDER |
| 20 |
921521-6406 |
* SCREW |
▶Fig.21 ASSEMBLY・KIT PARTS (10 parts)
| Ref |
OEM Part # |
Part Name |
| 1 |
346Q87304-C |
LOWER UNIT ASSY (UL) |
| 2 |
3KKJ87090-7 |
ENGINE SHORT BLOCK KIT |
| 3 |
922503-6414 |
* SCREW |
| 4 |
3A1-87121-6 |
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 |
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.
