Yamaha 25ELR Troubleshooting
| Engine Model: Yamaha 25ELR |
| Engine Type: 2-stroke 2-cylinder long shaft gasoline outboard engine |
| Total Displacement: 24.1 cu.in (395 cc) |
| Rated Engine Power: 25 Hp (18.4 kW) at 6000 rpm |
| Fuel System: Carburetor |
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| Engine will not start or hard to start |
Empty fuel tank - Add gasoline.
Improper fuel grade - Use quality fuel.
Water or air in fuel system - Remove air or water from system.
Spark plug wire is loose or disconnected - Check the spark plug wire connection, repair or replace.
Faulty spark plug - Install new spark plug.
Clogged fuel filter - Install new filter.
Problems with carburetor adjustment - Adjust as required.
Fuel lines are clogged - Clean fuel system lines.
Closed or clogged fuel tank air vent - Open or clean air vent.
Fuel pump pressure is low - Replace or repair fuel pump.
Worn or faulty reed valve - Install new reed valve.
| Engine starts but then stops |
Spark plug is defective - Change spark plug as required.
Carburetor is defective or clogged - Carburetor needs to be replaced or cleaned.
Damaged ignition coil - Replace ignition coil as necessary.
Closed or clogged fuel tank air vent - Open or clean air vent.
Fuel pump pressure is low - Install new pump or repair it.
Ignition system is defective - Inspect ignition system and change faulty parts.
Clogged or damaged fuel pump - Clean or install new fuel pump.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Dirty fuel lines - Clean fuel system lines.
Fuel tank air vent restricted or closed - Open or service air vent.
Plugged fuel filter - Install new filter.
Gaskets are worn - Replace gaskets.
Engine is under excessive load - Reduce the load.
Too lean carburetor mixture - Use proper settings.
Ignition timing is improper - Ignition timing needs to be set properly.
Thermostat is faulty - Thermostat need to be replaced.
Damaged water pump - Change water pump as required.
Improper propeller diameter or pitch - Install correct propeller.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard motor is positioned too low or too high - Mount the motor as required.
Stale fuel - Use correct fuel.
Engine overloaded - Load reducing required.
Improperly adjusted low idle speed - Need to adjust idle speed.
Dirty or faulty fuel pump - Clean or install new fuel pump.
Worn crankshaft or main bearings - Crankshaft or bearings need to be replaced.
Cylinder bore or piston rings are worn - Change faulty components.
Carburetor is dirty or incorrectly adjusted - Service or properly adjust carburetor.
Fuel pump is dirty or defective - Service or replace fuel pump.
Ignition system malfunction - Inspect ignition system and change failed components.
Worn gaskets - Install new gaskets.
Faulty powerhead components - Replace defective components.
Propeller selection improperly - Check the propeller size.
Damaged or bent propeller - Replace propeller.
Engine mounted at wrong transom height - Adjust the outboard motor height correctly.
Trim angle is incorrect - Adjust trim angle correctly.
Carburetor main jet is incorrectly adjusted - Adjust it properly.
Spark plug is defective or loose - Spark plug need to be tightened or replaced.
Rings, sleeve, or piston are damaged - Change faulty components.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Damaged propeller shaft - Replace propeller shaft.
Weeds clogs the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Steering pivot is faulty or loose Tighten correctly or replace.
Low battery power - Charge the battery.
Battery is not holding charge - Service charging system or change battery.
Terminals are faulty or battery cables are disconnected - Connect cables properly or replace terminals.
Starter motor is defective - Repair or replace starter.
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