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Tohatsu M18E2 Troubleshooting
The Tohatsu M18E2 is a two-stroke two-cylinder shallow water drive gasoline outboard engine. This engine has a carburetor fuel system, forced water cooling, and flywheel magneto CDI ignition system. A 17.9 cu.in (294 cc) outboard motor has a cylinder bore of 2.36" (60 mm), piston stroke of 2.05" (52 mm), and maximum power of 18 hp (13.2 kW) at 5200-5800 rpm. The boat motor is equipped with a forward-neutral-reverse gear shift, manual or electric starting system, 3-blades aluminum standard propeller, manual trim and tilt, and tiller handle or remote control steering system. The fuel tank has a capacity of 6.6 gal (25 liters).
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| Engine difficult to start or doesn't start |
No gasoline in tank - Fill it up.
Incorrect fuel grade - Use correct gasoline grade.
Air in the fuel lines - Bleed the fuel lines.
Damaged spark plug wiring connection - Check the spark plug wire connection, repair or replace.
Damaged spark plug - Spark plug need to be replaced.
Plugged fuel filter - Replace or clean fuel filter.
Carburetor settings incorrect - Adjusting as required.
Fuel lines clogging - Fuel lines need to be cleaned.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Install new pump or repair it.
Worn or faulty reed valve - Install new reed valve.
| Engine starts and stops immediately |
Damaged spark plug - Spark plug need to be replaced.
Dirty or defective carburetor - Clean or install new carburetor.
Damaged ignition coil - Replace ignition coil as necessary.
Fuel tank air vent closed or restricted - Open or clean air vent.
Lack of fuel pump pressure - Replace or rebuild fuel pump.
| Engine runs intermittently |
Defective ignition - Inspect ignition system and change faulty parts.
Dirty or faulty fuel pump - Service or replace fuel pump.
Carburetor components worn out - Repair or replace parts.
Clogged fuel lines - Service fuel lines.
Fuel tank air vent restricted or closed - Open or clean air vent.
Fuel filter is clogged - Fuel filter needs changing.
Worn gaskets - Install new gaskets.
| Engine overheated |
Excessive engine load - Reduce the load.
Carburetor fuel mixture is too lean - Use proper settings.
Bad ignition timing - Set the ignition timing correctly.
Thermostat is faulty - Install new thermostat.
Damaged water pump - Change water pump.
Incorrect propeller selection - Install correct propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor is mounted too high or too low - Position the engine correctly.
| Abnormal engine noise or knocking |
Low octane gasoline - Use proper gasoline.
Engine overloaded - Reduce load.
Improperly adjusted low idle speed - Correct idle settings.
Fuel pump is damaged or dirty - Clean or replace fuel pump.
Crankshaft or main bearings wear - Have bearings or crankshaft replaced.
Worn piston rings or cylinder bore - Replace defective components.
| Engine power is insufficient |
Carburetor is improperly adjusted or dirty - Adjust the carburetor correctly or clean it.
Clogged or damaged fuel pump - Check fuel pump and replace if necessary.
Ignition system malfunction - Inspect ignition system and change failed components.
Damaged gaskets - Install new gaskets.
Worn powerhead components - Defective components need to be replaced.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or bent propeller - Replace propeller.
Outboard motor mounting height is set incorrectly - Check the outboard engine mounting height.
Incorrect trim angle - Make the correct trim angle adjustment.
| Excessive fuel consumption |
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet properly.
Spark plug is loose or defective - Tighten or change the spark plug.
Worn piston, rings, or sleeve - Replace faulty components as required.
| Excessive engine vibration |
Damaged or bent propeller - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds in the propeller - Remove and clean propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Steering pivot is faulty or loose Tighten or replace.
| Starter does not work |
Battery voltage is low - Low battery charging, charge as required.
Battery does not hold charge - Battery needs to be serviced or replaced.
Corroded battery terminals or disconnected wires - Check battery wires and service or replace terminals.
Starter motor is defective - Starter should be changed.
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