Yamaha 25ELH Troubleshooting
| Engine Model: Yamaha 25ELH |
| 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 won't start or difficult to start |
No fuel in fuel tank - Fill gasoline up.
Wrong fuel grade - Use correct fuel grade.
Air in the fuel pipes - Bleed the fuel pipes.
Defective spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Spark plug is faulty - Change spark plug.
Plugged fuel filter - Change fuel filter.
Carburetor settings incorrect - Adjusting as required.
Restricted fuel lines - Clean fuel system lines.
Fuel tank air vent clogged or closed - Open or service air vent.
Fuel pump pressure is low - Change or rebuild fuel pump.
Damaged or worn fuel reed valve - Replace reed valve as required.
| Engine starts but stalls suddenly |
Spark plug is defective - Replace spark plug.
Dirty or defective carburetor - Service or change carburetor.
Defective ignition coil - Replace ignition coil as necessary.
Fuel tank air vent clogged or closed - Open or clean air vent.
Low fuel pump pressure - Replace or repair fuel pump.
Ignition failure - Check ignition and replace faulty components.
Dirty or faulty fuel pump - Service or change fuel pump.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Restricted fuel lines - Service fuel lines.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Plugged fuel filter - Replace or clean fuel filter.
Gaskets are damaged - Install new gaskets.
Engine is under excessive load - Reduce the load.
Carburetor fuel mixture is too lean - Make the correct settings.
Ignition timing is incorrect - Adjust ignition timing correctly.
Damaged thermostat - Change thermostat.
Water pump failure - Change water pump as required.
Incorrect propeller selection - Replace propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard engine is mounted too high or too low - Position the engine correctly.
Low octane gasoline - Change gasoline.
Engine is overloaded - Reduce load.
Low idle speed adjustment is incorrect - Correct idle settings.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Main bearings or crankshaft wear - Repair or replace defective parts.
Worn cylinder bore or piston rings - Change faulty parts.
Carburetor is improperly adjusted or clogged - Service or properly adjust carburetor.
Fuel pump is clogged or faulty - Inspect fuel pump and change as required.
Ignition system is defective - Inspect ignition system and change faulty parts.
Gaskets are damaged - Install new gaskets.
Powerhead components are damaged - Replace defective parts as required.
Propeller selection improperly - Replace propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor mounting height is set incorrectly - Check the outboard engine mounting height.
Improper trim angle - Make the correct trim angle adjustment.
Incorrect carburetor main jet adjustment - Adjust the carburetor main jet properly.
Loose or faulty spark plug - Re-tighten or replace spark plug.
Piston, sleeve, or rings are damaged - Change faulty components.
| Excessive engine vibration |
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft damaged - Replace propeller shaft.
Weeds wraped around propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
Low battery power - Battery needs to be recharged.
Battery discharges quickly - Service charging system or install new battery.
Disconnected wiring or bad battery terminals - Check wire connections and change or service terminals.
Starter motor failure - Repair or install a new starter.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
