Evinrude 90 V4 VRO Troubleshooting
| Engine Model: Evinrude 90 Hp V4 VRO |
| Engine Type: 2-stroke 4-cylinder gasoline outboard engine |
| Total Displacement: 90 cu.in (1.5 L) |
| Rated Engine Power: 90 Hp (67 kW) at 5500 rpm |
| Fuel System: One-barrel carburetors |
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| Engine won't start or starts hard |
No fuel in fuel tank - Fill gasoline up.
Improper fuel grade - Change fuel.
Air or water in fuel system - Remove water or air from fuel system.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Defective spark plug - Install new spark plug.
Clogged fuel filter - Fuel filter needs changing.
Problems with carburetor adjustment - Adjust as required.
Clogged fuel lines - Fuel lines must be clean.
Closed or clogged fuel tank air vent - Open or service air vent.
Lack of fuel pump pressure - Install new fuel pump or rebuild it.
Reed valve is faulty or worn - Install new reed valve.
| Engine starts but then shuts off |
Spark plug is defective - Change spark plug.
Carburetor is defective or clogged - Carburetor needs to be replaced or cleaned.
Faulty ignition coil - Change ignition coil as required.
Closed or restricted fuel tank air vent - Open or service air vent.
Lack of fuel pump pressure - Repair or change fuel pump.
| Engine runs intermittently |
Ignition system is defective - Test ignition and replace failed parts.
Fuel pump is faulty or clogged - Check fuel pump and replace if necessary.
Carburetor is not working properly - Inspect and adjust.
Clogged fuel lines - Clean fuel system lines.
Closed or clogged fuel tank air vent - Open or service air vent.
Clogged fuel filter - Fuel filter needs to be replaced.
Worn gaskets - Replace gaskets.
Engine overload - Reduce engine load.
Too lean fuel mixture in carburetor - Adjust carburetor properly.
Wrong ignition timing - Ignition timing needs to be adjusted correctly.
Faulty thermostat - Change thermostat.
Damaged water pump - Install new water pump.
Improper propeller diameter or pitch - Install correct propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
| Abnormal engine knocking or noise |
Stale fuel - Use correct fuel.
Engine is running overloaded - Reduce load.
Low idle speed set incorrectly - Correct idle settings.
Fuel pump is dirty or defective - Clean or replace fuel pump.
Main bearings or crankshaft failure - Install new parts as as required.
Worn cylinder bore or piston rings - Replace defective components.
| Engine power is insufficient |
Clogged or incorrectly adjusted carburetor - Carburetor needs to be adjusted correctly or cleaned.
Dirty or damaged fuel pump - Service or replace fuel pump.
Defective ignition - Test ignition and replace failed parts.
Gaskets are defective - Change gaskets.
Damaged powerhead parts - Replace defective components.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Adjust the engine to correct transom height.
Improper trim angle - Adjust trim angle correctly.
| Engine uses too much fuel |
Improper carburetor main jet adjustment - Adjust it properly.
Spark plug is defective or loose - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Replace defective parts as required.
| Excessive engine vibration |
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds in the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Damaged or loose steering pivot Tighten correctly or replace.
Low battery output - Battery needs to be recharged.
Battery won’t hold charge - Service battery or replace it.
Battery terminals are corroded or wires are disconnected - Check cables and service or change terminals.
Starter motor failing - Repair or change starter.
| Trim motor is running but trim system cannot move up or down |
Not enough oil - Checking oil level and add if necessary.
Pump assembly faulty - Inspect pump and change as required.
Leakage of manual release valve - Valve need to be closed or changed.
Broken motor or pump driveshaft - Replace worn component.
| Trim does not fully up or down |
Pump assembly is faulty - Change pump as required.
Tilt ram piston ball is not positioned correctly - Service or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Not enough oil - Check and refill oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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