Mercury 105 Jet 2-stroke problems
| Engine Model: Mercury 105 Jet |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 121.9 cu.in (1998 cc) |
| Rated Engine Power: 150 Hp (111.8 kW) at 5600 rpm |
| Fuel System: Float type carburetor |
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| Engine doesn't start or hard to start |
Empty gas tank - Add fuel.
Low-quality gasoline - Use quality fuel.
Air in the fuel lines - Bleed the fuel lines.
Spark plug wire is disconnected or loose - Check spark plug wiring connection, repair or change.
Faulty spark plug - Install new spark plug.
Fuel filter is clogged - Install new filter.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Fuel lines clogging - Fuel lines must be clean.
Fuel tank air vent closed or restricted - Open or service air vent.
Low fuel pump pressure - Install new fuel pump or rebuild it.
Worn or defective reed valve - Replace reed valve.
| Engine starts and then stalls |
Spark plug is faulty - Replace spark plug.
Dirty or defective carburetor - Service or change carburetor.
Damaged ignition coil - Replace ignition coil as necessary.
Fuel tank air vent clogged or closed - Open or service air vent.
Low fuel pump pressure - Change or rebuild fuel pump.
Defective ignition system - Test ignition and replace failed parts.
Fuel pump is clogged or faulty - Check fuel pump and replace if necessary.
Carburetor is clogged - Clean the carburetor.
Dirt in the fuel lines - Service fuel lines.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Fuel filter is plugged - Fuel filter needs to be replaced.
Worn gaskets - Install new gaskets.
Excessive engine load - Reduce load.
Carburetor fuel mixture is too lean - Adjust carburetor correctly.
Bad ignition timing - Adjust ignition timing as required.
Thermostat failure - Thermostat need to be replaced.
Damaged water pump - Install new water pump.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard motor is positioned too low or too high - Mount the motor as required.
Low octane gasoline - Change fuel.
Engine overload - Reduce engine load.
Incorrect low idle setting - Test and adjust.
Fuel pump is faulty or clogged - Clean or change fuel pump.
Main bearings or crankshaft failure - Need to install new components.
Damaged piston rings or cylinder bore - Replace defective components.
Improperly or clogged carburetor - Adjust the carburetor correctly or clean it.
Fuel pump is clogged or faulty - Clean or change fuel pump.
Ignition system failure - Inspect ignition system and change faulty parts.
Worn gaskets - Replace gaskets.
Powerhead parts are faulty - Change defective components.
Propeller pitch or diameter incorrect - Replace propeller.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Motor mounted at incorrect height on transom - Adjust the engine to correct transom height.
Improper trim angle - Make the correct trim angle adjustment.
Carburetor main jet adjustment is improper - Adjust it correctly.
Loose or defective spark plug - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Replace faulty parts as required.
| Engine vibrates excessively |
Damaged or improper size of propeller - Replace propeller.
Propeller shaft malfunction - Replace propeller shaft.
Weeds clogs the propeller - Clean the propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is loose or damaged Tighten or replace.
Battery capacity is low - Battery needs to be recharged.
Battery drains quickly - Battery needs service or replacement.
Bad terminals or disconnected battery cables - Check cable connections and change or clean terminals.
Defective starter motor - Replace or repair starter.
| Trim motor runs but trim system does not move up or down |
Oil level is low - Fill up oil.
Defective pump assembly - Check pump and change if required.
Leakage of manual drain valve - Close the valve fully or replace it.
Motor or pump driveshaft faulty - Replace worn component.
| Trim cannot be fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Tilt ram piston O-ring is worn - Replace O-ring.
Insufficient oil - Need to add the oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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