Yamaha 20CE Troubleshooting
| Engine Model: Yamaha 20CE |
| Engine Type: 2-stroke 2-cylinder gasoline outboard engine |
| Total Displacement: 26.2 cu.in (430 cc) |
| Rated Engine Power: 20 Hp (14.7 kW) at 5500 rpm |
| Fuel System: Carburetor |
____________________________________________________________________________________
| Engine will not start or difficult to start |
Empty gas tank - Fill it up.
Low-quality gasoline - Use quality fuel.
Clogged fuel system - Remove clogging.
Defective wiring connection of spark plug - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Replace spark plug.
Fuel filter is clogged - Fuel filter needs changing.
Carburetor is not adjusted - Check carburetor float adjustment.
Fuel lines are clogged - Fuel lines must be clean.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel pump pressure is low - Replace or rebuild fuel pump.
Worn or defective reed valve - Replace reed valve as required.
| Engine starts but stalls immediately |
Damaged spark plug - Install new spark plug.
Carburetor is clogged or defective - Clean or change carburetor.
Faulty ignition coil - Replace ignition coil as necessary.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump pressure is low - Repair or change fuel pump.
Defective ignition system - Test ignition and replace failed parts.
Clogged or defective fuel pump - Test fuel pump and replace if necessary.
Carburetor malfunction - Check and repair as required.
Fuel lines are dirty - Clean fuel system lines.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Plugged fuel filter - Fuel filter needs changing.
Gaskets are worn - Change gaskets.
Engine is under excessive load - Load reducing is recommended.
Carburetor mixture is too lean - Use proper settings.
Ignition timing is improper - Set the ignition timing correctly.
Thermostat is defective - Change thermostat.
Water pump malfunction - Replace water pump.
Incorrect propeller selection - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Outboard motor is mounted too high or too low - Position the engine correctly.
Stale fuel - Change fuel.
Excessive engine load - Reduce engine load.
Too low idle RPM - Correct the settings.
Dirty or defective fuel pump - Inspect fuel pump and change as required.
Worn crankshaft or main bearings - Have bearings or crankshaft replaced.
Cylinder bore or piston rings are damaged - Change faulty components.
| Engine power is insufficient |
Improperly or clogged carburetor - Clean or correctly adjust carburetor.
Clogged or damaged fuel pump - Inspect fuel pump and change as required.
Defective ignition - Inspect ignition system and change faulty parts.
Gaskets are defective - Replace gaskets.
Damaged powerhead parts - Replace defective parts.
Propeller selection improperly - Install correct propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Engine mounted at wrong transom height - Adjust the outboard motor height correctly.
Incorrect trim angle - Make the correct trim angle adjustment.
| Excessive fuel consumption |
Improper adjustment of carburetor main jet - Adjust it properly.
Loose or faulty spark plug - Spark plug need to be tightened or replaced.
Worn sleeve, rings, or piston - Change faulty parts.
| Excessive engine vibration |
Damaged or bent propeller - Replace propeller.
Propeller shaft damaged - Replace propeller shaft.
Weeds clogs the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is loose or damaged Tighten correctly or replace.
Low battery output voltage - Battery needs to be recharged.
Battery does not hold charge - Service battery or replace it.
Terminals are faulty or battery cables are disconnected - Connect wiring properly or install new terminals.
Starter motor is defective - Repair or replace starter.
____________________________________________________________________________________
| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
