Johnson 150 VRO Troubleshooting
| Engine Model: Johnson 150 VRO |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 158 cu.in (2.6 L) |
| Rated Engine Power: 150 Hp (110 kW) at 5500 rpm |
| Fuel System: Downdraft carburetors |
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| Engine starts up hard or doesn't start |
Empty gas tank - Fill it up.
Wrong fuel grade - Use quality fuel.
Air or water in fuel system - Remove water or air from fuel system.
Defective wiring connection of spark plug - Inspect the spark plug wire connection, replace or repair.
Defective spark plug - Install new spark plug.
Fuel filter is plugged - Replace or clean fuel filter.
Carburetor is not adjusted - Check carburetor float adjustment.
Dirt in the fuel lines - Service fuel lines.
Fuel tank air vent closed or restricted - Open or service air vent.
Low fuel pump pressure - Replace or rebuild fuel pump.
Reed valve is worn or damaged - Install new reed valve.
| Engine starts but stalls immediately |
Spark plug is damaged - Change spark plug.
Dirty or defective carburetor - Service or replace carburetor.
Damaged ignition coil - Replace ignition coil as necessary.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump pressure is low - Replace or repair fuel pump.
| Engine runs intermittently |
Ignition system malfunction - Inspect ignition system and change failed components.
Dirty or defective fuel pump - Service or replace fuel pump.
Carburetor not adjusted - Adjust according to instructions.
Fuel lines clogging - Clean fuel system lines.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Fuel filter is dirty - Change fuel filter.
Damaged gaskets - Replace gaskets.
Engine overload - Load reducing required.
Carburetor mixture is too lean - Use proper settings.
Bad ignition timing - Ignition timing needs to be adjusted correctly.
Thermostat is defective - Change thermostat as required.
Damaged water pump - Change water pump as required.
Propeller pitch or diameter incorrect - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Mount the motor as required.
Low octane gasoline - Change fuel.
Engine is running overloaded - Reduce load.
Incorrectly set low idle speed - Adjust idle speed.
Dirty or faulty fuel pump - Service or replace fuel pump.
Main bearings or crankshaft are worn out - Change defective components as required.
Worn cylinder bore or piston rings - Change defective components.
Carburetor is dirty or improperly adjusted - Clean or correctly adjust carburetor.
Dirty or defective fuel pump - Service or replace fuel pump.
Defective ignition - Check ignition and replace faulty components.
Gaskets are defective - Replace gaskets.
Damaged powerhead components - Replace defective components as required.
Improper propeller diameter or pitch - Install correct propeller.
Propeller bent or damaged - Replace propeller.
Outboard engine mounting height improperly - Check the outboard motor mounting height.
Improper trim angle - Adjust trim angle correctly.
Carburetor main jet adjustment is improper - Adjust main jet as required.
Loose or defective spark plug - Spark plug need to be tightened or replaced.
Rings, sleeve, or piston are damaged - Replace defective parts.
| Engine vibrates excessively |
Propeller bent or damaged - Have propeller repaired or replaced.
Damaged propeller shaft - Replace propeller shaft.
Weeds in the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
Loose or faulty steering pivot Tighten correctly or replace.
Low battery capacity - Battery needs to be recharged.
Battery discharges quickly - Service battery or replace it.
Bad terminals or disconnected battery cables - Check cable connections and replace or service terminals.
Starter motor is defective - Starter needs to be changed.
| Trim motor runs but trim system does not move up or down |
Lack of oil - Fill up oil.
Pump assembly is defective - Check pump and replace if necessary.
Manual release valve leaking - Close the valve or change it.
Motor or pump driveshaft faulty - Change worn component.
| Trim cannot be fully up or down |
Pump assembly is faulty - Replace pump.
Tilt ram piston ball is in wrong position - Clean or repair.
Damaged tilt ram piston O-ring - Change O-ring.
Insufficient oil - Fill up oil.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
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