Tohatsu M30H Troubleshooting
| Engine Model: Tohatsu M30H |
| Engine Type: 2-stroke 2-cylinder gasoline outboard engine |
| Total Displacement: 26.1 cu.in (429 cc) |
| Rated Engine Power: 30 Hp (22.1 kW) at 5500 rpm |
| Fuel System: Carburetor |
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| Engine starts up hard or will not start |
Empty gas tank - Add gasoline.
Wrong fuel grade - Use quality fuel.
There is air in the fuel system - Bleed the system.
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Change spark plug as required.
Fuel filter is dirty - Replace fuel filter.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Dirty fuel lines - Fuel lines need to be cleaned.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Repair or change fuel pump.
Damaged or worn fuel reed valve - Replace reed valve as required.
| Engine starts but then stops |
Faulty spark plug - Install new spark plug.
Dirty or faulty carburetor - Carburetor needs to be replaced or cleaned.
Ignition coil is damaged - Ignition coil must be replaced.
Fuel tank air vent closed or restricted - Open or service air vent.
Low fuel pump pressure - Install new pump or repair it.
Defective ignition system - Check ignition system and replace faulty parts.
Dirty or damaged fuel pump - Service or replace fuel pump.
Carburetor is not working properly - Inspect and adjust.
Clogged fuel lines - Clean fuel system lines.
Closed or clogged fuel tank air vent - Open or clean air vent.
Dirty fuel filter - Replace fuel filter.
Gaskets are worn - Replace gaskets.
Engine is running overloaded - Load reducing is recommended.
Carburetor fuel mixture is too lean - Make the correct settings.
Ignition timing is wrong - Adjust ignition timing correctly.
Thermostat failure - Change thermostat as required.
Damaged water pump - Change water pump.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Stale or low octane fuel - Change gasoline.
Engine is under excessive load - Reduce the load.
Low idle speed adjustment is incorrect - Adjust the low idle speed.
Dirty or faulty fuel pump - Clean or change fuel pump.
Main bearings or crankshaft are worn out - Change defective components as required.
Worn piston rings or cylinder bore - Replace defective parts.
Incorrectly adjusted or dirty carburetor - Adjust carburetor properly or service it.
Fuel pump is damaged or dirty - Inspect fuel pump and change as required.
Ignition system problems - Test ignition and replace failed parts.
Worn gaskets - Replace gaskets.
Faulty powerhead components - Change defective components.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Engine mounted at wrong transom height - Adjust the engine to correct transom height.
Trim angle is incorrect - Adjust trim angle.
| Excessive fuel consumption |
Improper carburetor main jet adjustment - Adjust the carburetor main jet properly.
Loose or defective spark plug - Re-tighten or change the spark plug.
Worn sleeve, piston, or rings - Replace faulty parts as required.
| Excessive motor vibration |
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds in the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
Battery voltage is low - Charge the battery.
Battery will not hold charge - Service or replace the battery.
Bad terminals or disconnected battery cables - Check wiring connections and replace or clean terminals.
Starter motor is faulty - Starter needs to be changed.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
