Tohatsu M25C2 Troubleshooting
| Engine Model: Tohatsu M25C2 |
| Engine Type: 2-stroke 2-cylinder gasoline outboard engine |
| Total Displacement: 26.2 cu.in (429 cc) |
| Rated Engine Power: 25 Hp (18.4 kW) at 5500 rpm |
| Fuel System: Carburetor |
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| Engine doesn't start or starts hard |
Empty fuel tank - Add gasoline.
Improper fuel grade - Change gasoline.
There is air in the fuel system - Bleed the system.
Defective spark plug wire connection - Check spark plug wiring connection, repair or change.
Spark plug is faulty - Change spark plug as required.
Fuel filter is plugged - Change fuel filter.
Carburetor components worn out - Repair or replace parts.
Fuel lines are clogged - Service fuel lines.
Fuel tank air vent clogged or closed - Open or clean air vent.
Lack of fuel pump pressure - Replace or repair fuel pump.
Worn or defective reed valve - Install new reed valve.
| Engine starts and stalls suddenly |
Spark plug is faulty - Change spark plug as required.
Dirty or faulty carburetor - Clean or install new carburetor.
Defective ignition coil - Ignition coil should be replaced.
Closed or clogged fuel tank air vent - Open or service air vent.
Low fuel pump pressure - Replace or repair fuel pump.
Ignition system failure - Inspect ignition system and change failed components.
Clogged or defective fuel pump - Clean or replace fuel pump.
Problems with carburetor adjustment - Adjust as required.
Clogged fuel lines - Fuel lines need to be cleaned.
Fuel tank air vent restricted or closed - Open or clean air vent.
Fuel filter is clogged - Fuel filter needs changing.
Worn gaskets - Replace gaskets.
Excessive engine load - Reduce load.
Carburetor is running lean - Set the carburetor properly.
Ignition timing is wrong - Set the ignition timing correctly.
Thermostat failure - Replace thermostat.
Water pump is defective - Change water pump.
Incorrect propeller selection - Replace propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Mount the motor as required.
| Abnormal engine noise or knocking |
Low octane fuel - Use proper fuel.
Engine overload - Load reducing is recommended.
Low idle speed adjustment is incorrect - Correct the settings.
Clogged or damaged fuel pump - Clean or replace fuel pump.
Worn crankshaft or main bearings - Install new parts as as required.
Piston rings or cylinder bore are damaged - Replace defective components.
Carburetor is improperly adjusted or dirty - Service or properly adjust carburetor.
Fuel pump is defective or dirty - Clean or install new fuel pump.
Defective ignition - Inspect ignition system and change faulty parts.
Gaskets are defective - Install new gaskets.
Powerhead components are faulty - Replace defective parts.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Incorrect outboard motor mounting height - Check the outboard motor mounting height.
Trim angle is incorrect - Adjust trim angle.
Incorrect carburetor main jet adjustment - Adjust main jet as required.
Spark plug is loose or faulty - Change or re-tighten spark plug.
Worn rings, piston, or sleeve - Replace faulty parts as required.
| Motor vibrates excessively |
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft damaged - Replace propeller shaft.
Weeds wraped around propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is faulty or loose Tighten correctly or replace.
Low battery output voltage - Charge the battery.
Battery runs out quickly - Service or change the battery.
Faulty battery terminals or disconnected cables - Check wiring connections and replace or clean terminals.
Starter motor failing - Repair or change starter.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
