Tohatsu M6B Troubleshooting
| Engine Model: Tohatsu M6B |
| Engine Type: 2-stroke 2-cylinder gasoline outboard engine |
| Total Displacement: 10.3 cu.in (169 cc) |
| Rated Engine Power: 6 Hp (4.4 kW) at 5500 rpm |
| Fuel System: Carburetor |
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| Engine hard starting or not starting |
Empty fuel tank - Add fuel.
Wrong fuel grade - Change fuel.
Air in fuel system - Bleed fuel system.
Loose or disconnected spark plug wire - Inspect the spark plug wire connection, replace or repair.
Spark plug is faulty - Install new spark plug.
Fuel filter is dirty - Change fuel filter.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Clogged fuel lines - Clean fuel system lines.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Install new pump or repair it.
Reed valve is worn or damaged - Replace reed valve.
| Engine starts but immediately stops |
Spark plug is defective - Change spark plug as required.
Carburetor is clogged or defective - Clean or install new carburetor.
Ignition coil is faulty - Change ignition coil as required.
Closed or restricted fuel tank air vent - Open or service air vent.
Low fuel pump pressure - Install new pump or repair it.
Defective ignition system - Inspect ignition system and change faulty parts.
Clogged or damaged fuel pump - Clean or change fuel pump.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Clogged fuel lines - Clean fuel lines.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Dirty fuel filter - Replace fuel filter.
Damaged gaskets - Replace gaskets.
Engine is running overloaded - Reduce load.
Carburetor fuel mixture is too lean - Set the carburetor properly.
Ignition timing is incorrect - Ignition timing needs to be set properly.
Thermostat is faulty - Replace thermostat.
Water pump is defective - Install new water pump.
Propeller pitch or diameter incorrect - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard engine is mounted too high or too low - Mount the motor as required.
Stale gasoline - Use correct fuel.
Engine is under excessive load - Reduce load.
Incorrectly set low idle speed - Adjust idling as required.
Dirty or damaged fuel pump - Test fuel pump and change if necessary.
Worn main bearings or crankshaft - Change or repair worn components.
Worn piston rings or cylinder bore - Change faulty components.
Incorrectly adjusted or clogged carburetor - Adjust the carburetor correctly or clean it.
Clogged or damaged fuel pump - Clean or replace fuel pump.
Defective ignition - Inspect ignition system and change failed components.
Worn gaskets - Install new gaskets.
Powerhead components are damaged - Change defective parts.
Propeller pitch or diameter incorrect - Install correct propeller.
Propeller bent or damaged - Replace propeller.
Outboard engine mounting height improperly - Check the outboard engine mounting height.
Trim angle is incorrect - Make the correct trim angle adjustment.
Improper carburetor main jet adjustment - Adjust it properly.
Spark plug is loose or faulty - Re-tighten or replace spark plug.
Worn rings, piston, or sleeve - Change faulty components.
| Excessive engine vibration |
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds wraped around propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is loose or damaged Tighten or replace.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
