Tohatsu M3.5A2 Troubleshooting
| Engine Model: Tohatsu M3.5A2 |
| 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 starts hard or will not start |
Gas tank is empty - Fill gasoline up.
Wrong fuel grade - Use correct gasoline grade.
Air in fuel system - Bleed fuel system.
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug.
Fuel filter is clogged - Replace or clean fuel filter.
Carburetor malfunction - Check and repair as required.
Clogged fuel lines - Fuel lines need to be cleaned.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Lack of fuel pump pressure - Replace or repair fuel pump.
Reed valve is faulty or worn - Replace reed valve.
| Engine starts and immediately shuts off |
Faulty spark plug - Change spark plug as required.
Dirty or faulty carburetor - Clean or replace carburetor.
Ignition coil is not working - Ignition coil must be replaced.
Fuel tank air vent clogged or closed - Open or clean air vent.
Lack of fuel pump pressure - Repair or change fuel pump.
Ignition failure - Inspect ignition system and change failed components.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
Carburetor is dirty - Wash, clean and adjust.
Dirt in the fuel lines - Clean fuel system lines.
Fuel tank air vent restricted or closed - Open or service air vent.
Clogged fuel filter - Change fuel filter.
Worn gaskets - Install new gaskets.
Engine is overloaded - Reduce engine load.
Carburetor fuel mixture is too lean - Adjust carburetor correctly.
Ignition timing is improper - Set the ignition timing correctly.
Thermostat failure - Replace thermostat.
Faulty water pump - Replace water pump.
Incorrect propeller selection - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Position the engine correctly.
| Abnormal engine noise or knocking |
Low octane gasoline - Change gasoline.
Engine is running overloaded - Load reducing required.
Low idle speed adjustment is incorrect - Correct the settings.
Dirty or damaged fuel pump - Clean or change fuel pump.
Main bearings or crankshaft failure - Install new parts as as required.
Damaged cylinder bore or piston rings - Replace defective parts.
Carburetor is improperly adjusted or clogged - Clean or correctly adjust carburetor.
Fuel pump is clogged or faulty - Clean or change fuel pump.
Defective ignition system - Check ignition and replace faulty components.
Worn gaskets - Change gaskets.
Powerhead parts are worn out - Replace defective components as required.
Improper propeller diameter or pitch - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine mounting height improperly - Check the outboard motor mounting height.
Trim angle is incorrect - Adjust trim angle.
| Engine using too much gasoline |
Improper adjustment of carburetor main jet - Adjust it properly.
Loose or faulty spark plug - Re-tighten or change the spark plug.
Worn piston, rings, or sleeve - Change faulty components.
| Engine vibrates excessively |
Damaged or bent propeller - Have propeller repaired or replaced.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds clogs the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
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 |
