Tohatsu MFS6CD Troubleshooting
| Engine Model: Tohatsu MFS6CD |
| Engine Type: 4-stroke 1-cylinder OHV gasoline outboard engine |
| Total Displacement: 7.5 cu.in (123 cc) |
| Rated Engine Power: 6 Hp (4.4 kW) at 6000 rpm |
| Fuel System: Carburetor |
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| Engine hard to start or will not start |
Gas tank is empty - Fill gasoline up.
Wrong grade of gasoline - Use correct fuel grade.
Dirt and debris in fuel system - Remove debris and dirt.
Disconnected or loose spark plug wire - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Change spark plug as required.
Fuel filter is clogged - Replace fuel filter.
Carburetor settings incorrect - Adjusting as required.
Restricted fuel lines - Fuel lines must be clean.
Fuel tank air vent restricted or closed - Open or clean air vent.
Faulty fuel pump - Install new pump or repair it.
Throttle cable is worn or adjusted improperly - Replace cable or adjust correctly.
Excessive valve clearance - Check and adjust.
Valve timing is incorrect - Adjust valve timing as required.
| Engine starts and stalls suddenly |
Faulty spark plug - Change spark plug.
Dirty or faulty carburetor - Carburetor needs to be replaced or cleaned.
Ignition coil is damaged - Replace ignition coil as necessary.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Faulty fuel pump - Replace or repair fuel pump.
Choke system malfunction - Inspect and replace choke system components.
Valve clearance is not correct - Adjust to proper valve clearance.
Wrong valve timing - Adjust valve timing as required.
Broken or bad valve springs - Replace valve springs.
Valves sticking - Clean the valves.
Ignition failure - Check ignition and replace faulty components.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Carburetor is not working properly - Inspect and adjust.
Dirt in the fuel lines - Service fuel lines.
Closed or clogged fuel tank air vent - Open or service air vent.
Clogged fuel filter - Install new filter.
Gaskets are worn - Install new gaskets.
Water intake screen is dirty - Need to clean or wash.
Choke system malfunction - Inspect and replace choke system components.
Engine overload - Reduce load.
Carburetor fuel mixture is too lean - Set the carburetor correctly.
Ignition timing is wrong - Adjust ignition timing as required.
Thermostat is faulty - Change thermostat.
Water pump failure - Change water pump.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard motor is positioned too low or too high - Mount the motor as required.
Low engine oil level - Fill up the oil to required level.
Defective oil pump - Change oil pump.
Clogged water intake - Wash or clean as required.
Valve setting is incorrect - Set the valves properly.
Stale or low octane fuel - Change fuel.
Engine overloaded - Reduce load.
Incorrectly set low idle speed - Adjust the low idle speed.
Fuel pump is clogged or faulty - Inspect fuel pump and change as required.
Crankshaft or main bearings failure - Install new parts as as required.
Piston rings or cylinder bore are worn - Change faulty components.
Improperly or clogged carburetor - Adjust the carburetor correctly or clean it.
Dirty or damaged fuel pump - Test fuel pump and replace if necessary.
Defective ignition - Inspect ignition system and change failed components.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Powerhead parts are damaged - Defective parts need to be replaced.
Stuck or burned valves - Clean or change valves.
Incorrect propeller selection - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard motor mounting height is set incorrectly - Adjust the outboard motor height correctly.
Incorrect trim angle - Adjust trim angle correctly.
| Engine uses too much fuel |
Carburetor main jet is improperly adjusted - Adjust main jet as required.
Spark plug is loose or faulty - Spark plug need to be replaced or tightened.
Sleeve, rings, or piston are damaged - Change defective parts.
Damaged or bent propeller - Replace propeller.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is loose or damaged Tighten or replace.
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