Yamaha 50TLR Troubleshooting
| Engine Model: Yamaha 50TLR |
| Engine Type: 2-stroke inline 3-cylinder gasoline outboard engine |
| Total Displacement: 42.6 cu.in (698 cc) |
| Rated Engine Power: 50 Hp (36.8 kW) at 5000 rpm |
| Fuel System: Carburetor |
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| Engine hard starting or not starting |
Empty fuel tank - Add fuel.
Wrong grade of gasoline - Use quality gasoline.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug as required.
Plugged fuel filter - Fuel filter needs to be replaced.
Carburetor is dirty - Wash, clean and adjust.
Fuel lines clogging - Fuel lines need to be cleaned.
Closed or restricted fuel tank air vent - Open or service air vent.
Fuel pump pressure is low - Replace or rebuild fuel pump.
Reed valve is worn or damaged - Replace reed valve as required.
| Engine starts and immediately shuts off |
Spark plug is defective - Spark plug need to be replaced.
Defective or dirty carburetor - Service or change carburetor.
Ignition coil is damaged - Change ignition coil as required.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump pressure is low - Replace or repair fuel pump.
| Engine runs intermittently |
Ignition system is defective - Test ignition and replace failed parts.
Clogged or defective fuel pump - Clean or install new fuel pump.
Carburetor is not adjusted - Check carburetor float adjustment.
Fuel lines clogging - Service fuel lines.
Closed or restricted fuel tank air vent - Open or service air vent.
Plugged fuel filter - Change fuel filter.
Gaskets are worn - Install new gaskets.
Excessive engine load - Reduce the load.
Too lean fuel mixture in carburetor - Make the correct settings.
Ignition timing is incorrect - Ignition timing needs to be adjusted correctly.
Damaged thermostat - Thermostat need to be replaced.
Water pump is defective - Change water pump.
Incorrect propeller selection - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Position the engine correctly.
| Abnormal engine noise or knocking |
Low octane fuel - Use proper gasoline.
Excessive engine load - Load reducing is recommended.
Low idle speed setting is not correct - Adjust idle speed.
Fuel pump is dirty or defective - Clean or install new fuel pump.
Worn main bearings or crankshaft - Crankshaft or bearings need to be replaced.
Damaged cylinder bore or piston rings - Change faulty parts.
Improperly adjusted or dirty carburetor - Adjust the carburetor correctly or clean it.
Dirty or faulty fuel pump - Test fuel pump and change if necessary.
Defective ignition system - Test ignition and replace failed parts.
Damaged gaskets - Replace gaskets.
Faulty powerhead components - Change defective components.
Propeller selection improperly - Install correct propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Have motor adjusted to proper transom height.
Trim angle is incorrect - Adjust trim angle.
| Engine using too much gasoline |
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet correctly.
Spark plug is loose or defective - Replace or tighten spark plug.
Piston, sleeve, or rings are damaged - Replace faulty components as required.
| Motor vibrates excessively |
Damaged or bent propeller - Replace propeller.
Propeller shaft damaged - Replace propeller shaft.
Weeds in the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Steering pivot is faulty or loose Tighten or replace.
Low battery capacity - Battery is drained, charge it.
Battery does not hold charge - Service charging system or install new battery.
Bad battery terminals or disconnected wiring - Check cables and service or change terminals.
Damaged starter motor - Repair or change starter.
| Trim motor runs but trim system does not move up or down |
Insufficient oil - Fill up oil.
Pump assembly is defective - Check pump and change if required.
Leakage of manual release valve - Close the valve or change it.
Faulty pump driveshaft or motor - Change defective component.
| Trim cannot be fully up or down |
Defective pump assembly - Change pump as required.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Tilt ram piston O-ring damaged - Change O-ring.
Oil insufficient - Need to add the oil.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
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| Outboard Engines Technical Specifications |
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