Yamaha F5AMHS Troubleshooting
| Engine Model: Yamaha F5AMHS |
| Engine Type: 4-stroke 1-cylinder short shaft gasoline outboard engine |
| Total Displacement: 8.5 cu.in (139 cc) |
| Rated Engine Power: 5 Hp (3.7 kW) at 5500 rpm |
| Fuel System: Carburetor |
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| Engine hard to start or will not start |
Fuel tank is empty - Add fuel.
Improper fuel grade - Use correct fuel grade.
Air in fuel tank - Bleed fuel tank.
Spark plug wiring connection is defective - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug.
Dirty fuel filter - Fuel filter needs changing.
Carburetor is clogged - Clean the carburetor.
Restricted fuel lines - Clean fuel lines.
Closed or clogged fuel tank air vent - Open or clean air vent.
Fuel pump is faulty - Repair or change fuel pump.
Throttle cable is adjusted improperly or worn - Replace cable or adjust properly.
Incorrect valve clearance - Adjust valve clearance according to specifications.
Valve timing is improper - Adjust valve timing correctly.
| Engine starts but immediately shuts off |
Defective spark plug - Spark plug need to be replaced.
Carburetor is dirty or faulty - Clean or replace carburetor.
Damaged ignition coil - Install a new ignition coil.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump defective - Repair or change fuel pump.
Choke system malfunction - Check and repair choke system.
Valve clearance is not correct - Adjust to proper valve clearance.
Incorrect valve timing - Adjust valve timing as required.
Valve springs are damaged or weak - Valve springs need to be changed.
Valves are stuck - Clean the valves.
Ignition system is defective - Inspect ignition system and change faulty parts.
Dirty or damaged fuel pump - Clean or replace fuel pump.
Carburetor is dirty - Wash, clean and adjust.
Dirt in the fuel lines - Fuel lines must be clean.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Dirty fuel filter - Replace fuel filter.
Worn gaskets - Change gaskets.
Water intake is blocked - Need to wash or clean.
Choke system is damaged - Inspect and replace choke system components.
Engine overloaded - Reduce the load.
Carburetor mixture is too lean - Adjust carburetor properly.
Improper ignition timing - Ignition timing needs to be adjusted correctly.
Damaged thermostat - Change thermostat as required.
Water pump malfunction - Install new water pump.
Incorrect propeller selection - Install correct propeller.
Propeller bent or damaged - Replace propeller.
Outboard engine is mounted too high or too low - Mount the motor as required.
Engine oil level is low - Fill up the engine oil.
Oil pump is defective - Oil pump need to be replaced.
Water intake is clogged - Need to wash or clean.
Valve setting is wrong - Adjust valves as required.
Low octane fuel - Use proper gasoline.
Engine overloaded - Load reducing required.
Wrong adjustment of low idle speed - Adjust idling as required.
Dirty or damaged fuel pump - Service or change fuel pump.
Worn crankshaft or main bearings - Repair or replace defective parts.
Cylinder bore or piston rings are worn - Replace defective components.
Incorrectly adjusted or dirty carburetor - Adjust the carburetor correctly or clean it.
Dirty or damaged fuel pump - Service or replace fuel pump.
Ignition failure - Check ignition and replace faulty components.
Cylinder head gasket is defective - Replace cylinder head gasket.
Damaged powerhead parts - Replace defective parts.
Burned or stuck valves - Service or change valves.
Incorrect propeller selection - Install correct propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard engine mounting height improperly - Check the outboard motor mounting height.
Trim angle is incorrect - Adjust trim angle correctly.
| Excessive fuel consumption |
Incorrect carburetor main jet adjustment - Adjust the carburetor main jet properly.
Spark plug is defective or loose - Change or re-tighten spark plug.
Worn piston, rings, or sleeve - Replace defective parts.
| Excessive motor vibration |
Propeller bent or damaged - Replace propeller.
Damaged propeller shaft - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
