Tohatsu M3.5B2 Troubleshooting
| Engine Model: Tohatsu M3.5B2 3FO |
| Engine Type: 2-stroke 1-cylinder gasoline outboard engine |
| Total Displacement: 4.6 cu.in (74.5 cc) |
| Rated Engine Power: 3.5 Hp (2.6 kW) at 5300 rpm |
| Fuel System: Carburetor |
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| Engine hard to start or doesn't start |
Empty gas tank - Add gasoline.
Low-quality gasoline - Use correct fuel grade.
There is air in the fuel system - Bleed the system.
Spark plug wire connection are damaged - Inspect the spark plug wire connection, replace or repair.
Faulty spark plug - Spark plug need to be replaced.
Clogged fuel filter - Replace fuel filter.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Dirty fuel lines - Clean fuel lines.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Fuel pump pressure is low - Replace or rebuild fuel pump.
Reed valve is faulty or worn - Replace reed valve as required.
| Engine stalls after starting |
Spark plug is damaged - Change spark plug.
Clogged or faulty carburetor - Replace or service carburetor.
Ignition coil is damaged - Replace ignition coil as necessary.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump pressure is low - Install new fuel pump or rebuild it.
Ignition system problems - Check ignition and replace faulty components.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Carburetor is clogged - Clean the carburetor.
Fuel lines are dirty - Service fuel lines.
Closed or clogged fuel tank air vent - Open or clean air vent.
Plugged fuel filter - Change fuel filter.
Gaskets are worn - Replace gaskets.
Excessive engine load - Reduce engine load.
Too lean fuel mixture in carburetor - Use proper settings.
Ignition timing is incorrect - Adjust ignition timing as required.
Thermostat failure - Thermostat need to be replaced.
Water pump is defective - Change water pump.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Outboard engine is mounted too high or too low - Mount the motor as required.
Low octane fuel - Change fuel.
Engine overloaded - Load reducing is recommended.
Incorrect low idle setting - Test and adjust.
Fuel pump is dirty or defective - Clean or install new fuel pump.
Worn main bearings or crankshaft - Have bearings or crankshaft replaced.
Damaged piston rings or cylinder bore - Replace faulty components.
Carburetor is clogged or incorrectly adjusted - Adjust carburetor properly or service it.
Clogged or damaged fuel pump - Clean or install new fuel pump.
Defective ignition - Inspect ignition system and change faulty parts.
Gaskets are worn - Change gaskets.
Faulty powerhead components - Defective components need to be replaced.
Propeller selection improperly - Check the propeller size.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard engine mounting height improperly - Check the outboard motor mounting height.
Incorrect trim angle - Adjust trim angle.
| Engine using too much gasoline |
Carburetor main jet adjustment is improper - Adjust main jet as required.
Spark plug is faulty or loose - Spark plug need to be replaced or tightened.
Worn sleeve, rings, or piston - Change faulty parts.
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds wraped around propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
Damaged or loose steering pivot Tighten correctly or replace.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
