Tohatsu M50D Troubleshooting
| Engine Model: Tohatsu M50D |
| Engine Type: 2-stroke 3-cylinder gasoline outboard engine |
| Total Displacement: 42.5 cu.in (697 cc) |
| Rated Engine Power: 50 Hp (36.8 kW) at 5500 rpm |
| Fuel System: Carburetor |
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| Engine starts hard or won't start |
Fuel tank is empty - Fill gasoline up.
Improper fuel grade - Change gasoline.
Air in fuel system - Bleed fuel system.
Spark plug wire is loose or disconnected - Inspect the spark plug wire connection, replace or repair.
Spark plug is damaged - Spark plug need to be replaced.
Fuel filter is clogged - Fuel filter needs to be replaced.
Carburetor components worn out - Repair or replace parts.
Fuel lines are dirty - Fuel lines must be clean.
Closed or clogged fuel tank air vent - Open or service air vent.
Lack of fuel pump pressure - Change or rebuild fuel pump.
Reed valve is worn or damaged - Replace reed valve as required.
Damaged spark plug - Spark plug need to be replaced.
Carburetor is faulty or dirty - Service or change carburetor.
Faulty ignition coil - Ignition coil should be replaced.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump pressure is low - Replace or repair fuel pump.
| Engine runs intermittently |
Ignition system failure - Check ignition and replace faulty components.
Fuel pump is defective or dirty - Check fuel pump and replace if necessary.
Carburetor not adjusted - Adjust according to instructions.
Fuel lines are dirty - Service fuel lines.
Fuel tank air vent closed or restricted - Open or service air vent.
Plugged fuel filter - Change fuel filter.
Gaskets are damaged - Change gaskets.
Engine overload - Load reducing required.
Carburetor mixture is too lean - Set the carburetor properly.
Wrong ignition timing - Set the ignition timing properly.
Thermostat is defective - Install new thermostat.
Defective water pump - Replace water pump.
Propeller selection improperly - Replace propeller.
Propeller bent or damaged - Replace propeller.
Outboard engine is mounted too high or too low - Position the engine correctly.
| Abnormal engine knocking or noise |
Low octane gasoline - Use proper gasoline.
Excessive engine load - Load reducing required.
Incorrect low idle setting - Need to adjust idle speed.
Clogged or defective fuel pump - Inspect fuel pump and change as required.
Crankshaft or main bearings are worn out - Crankshaft or bearings need to be replaced.
Worn cylinder bore or piston rings - Change faulty parts.
Improperly adjusted or dirty carburetor - Service or properly adjust carburetor.
Fuel pump is defective or dirty - Test fuel pump and change if necessary.
Defective ignition - Inspect ignition system and change failed components.
Gaskets are defective - Replace gaskets.
Worn powerhead parts - Replace defective parts as required.
Propeller selection improperly - Replace propeller.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Motor mounted at incorrect height on transom - Check the outboard motor mounting height.
Trim angle is incorrect - Adjust trim angle correctly.
Carburetor main jet adjustment is incorrect - Adjust it properly.
Faulty or loose spark plug - Spark plug need to be tightened or replaced.
Worn rings, piston, or sleeve - Replace faulty parts.
Propeller bent or damaged - Have propeller repaired or replaced.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds clogs the propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is faulty or loose Tighten or replace.
Low battery voltage - Battery is drained, charge it.
Battery is draining quickly - Service or change the battery.
Corroded battery terminals or disconnected wires - Check cable connections and replace or service terminals.
Starter motor is defective - Starter should be replaced.
| Trim motor is running but trim system cannot move up or down |
Oil insufficient - Check oil level and add oil as required.
Damaged pump assembly - Check pump and change if required.
Manual release valve leaking - Close the valve or change it.
Broken motor or pump driveshaft - Replace defective component.
| Trim does not fully up or down |
Damaged pump assembly - Replace pump.
Tilt ram piston ball is in wrong position - Clean or repair.
Tilt ram piston O-ring is worn - Change O-ring.
Oil level is low - Need to add the oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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| Outboard Engines Technical Specifications |
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