Yamaha F6AMH Troubleshooting
| Engine Model: Yamaha F6AMH |
| Engine Type: 4-stroke 2-cylinder SOHC gasoline outboard engine |
| Total Displacement: 12 cu.in (197 cc) |
| Rated Engine Power: 6 Hp (4.4 kW) at 5500 rpm |
| Fuel System: Carburetor |
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| Engine starts hard or doesn't start |
Empty gas tank - Fill it up.
Wrong grade of gasoline - Change fuel.
Air in fuel tank - Bleed fuel tank.
Defective wiring connection of spark plug - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Install new spark plug.
Fuel filter is clogged - Fuel filter needs to be replaced.
Carburetor is not adjusted - Check carburetor float adjustment.
Dirty fuel lines - Service fuel lines.
Fuel tank air vent closed or restricted - Open or service air vent.
Fuel pump is faulty - Install new pump or repair it.
Throttle cable is adjusted incorrectly or damaged - Adjust properly or change the cable.
Valve clearance is incorrect - Adjust valve clearance.
Incorrect valve timing - Adjust valve timing as required.
| Engine starts but stalls immediately |
Spark plug is damaged - Replace spark plug.
Faulty or clogged carburetor - Replace or service carburetor.
Defective ignition coil - Replace ignition coil as necessary.
Fuel tank air vent closed or restricted - Open or service air vent.
Fuel pump malfunction - Replace or repair fuel pump.
Choke system is damaged - Inspect and replace choke system components.
Improper valve clearance - Check and adjust.
Valve timing is improper - Set the valve timing correctly.
Valve springs are loose or broken - Replace valve springs.
Valves sticking - Service the valves.
Defective ignition system - Check ignition and replace faulty components.
Fuel pump is clogged or faulty - Clean or change fuel pump.
Carburetor is not working properly - Inspect and adjust.
Dirt in the fuel lines - Fuel lines must be clean.
Fuel tank air vent restricted or closed - Open or clean air vent.
Plugged fuel filter - Replace or clean fuel filter.
Gaskets are damaged - Replace gaskets.
Clogged water intake - Clean and wash as required.
Choke system is damaged - Inspect and replace choke system components.
Engine overloaded - Load reducing required.
Too lean carburetor mixture - Use proper settings.
Ignition timing is wrong - Ignition timing needs to be set properly.
Defective thermostat - Replace thermostat.
Damaged water pump - Change water pump.
Incorrect propeller selection - Install correct propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard engine is positioned too low or too high - Mount the motor as required.
Engine oil level is low - Check oil level and add oil as required.
Damaged oil pump - Replace oil pump.
Water intake screen is dirty - Need to wash or clean.
Wrong valve setting - Set the valves properly.
Stale gasoline - Use proper gasoline.
Engine is under excessive load - Reduce load.
Low idle speed set incorrectly - Adjust as required.
Dirty or damaged fuel pump - Inspect fuel pump and change as required.
Main bearings or crankshaft failure - Have bearings or crankshaft replaced.
Piston rings or cylinder bore are damaged - Replace defective components.
Carburetor is clogged or improperly adjusted - Service or properly adjust carburetor.
Dirty or defective fuel pump - Clean or change fuel pump.
Defective ignition system - Inspect ignition system and change failed components.
Damaged cylinder head gasket - Replace cylinder head gasket.
Powerhead components are worn - Replace defective parts.
Valves are stuck or burned - Replace or clean valves.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard engine mounting height improperly - Adjust the outboard motor height correctly.
Trim angle is incorrect - Make the correct trim angle adjustment.
| Engine uses too much fuel |
Carburetor main jet is incorrectly adjusted - Adjust it properly.
Spark plug is faulty or loose - Spark plug need to be tightened or replaced.
Rings, sleeve, or piston are damaged - Change defective components.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Propeller shaft malfunction - Have propeller shaft replaced.
Weeds wraped around propeller - Remove and clean propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is faulty or loose Tighten or replace.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
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| Industrial Engines Technical Specifications |
