Evinrude 9.9 Hp 4 stroke Problems
| Engine Model: Evinrude 9.9 Hp |
| Engine Type: 4-stroke in-line 2-cylinder OHC gasoline outboard engine |
| Total Displacement: 12.8 cu.in (211 cc) |
| Rated Engine Power: 9.9 Hp (7.4 kW) at 6000 rpm |
| Fuel System: Carburetor or Electronic fuel injection (EFI) |
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| Engine doesn't start or hard to start |
No gasoline in tank - Fill fuel up.
Wrong fuel grade - Use correct fuel grade.
Clogged fuel system - Remove clogging.
Spark plug wire connection are damaged - Inspect the spark plug wire connection, replace or repair.
Spark plug is defective - Replace spark plug.
Fuel filter is plugged - Fuel filter needs changing.
Carburetor settings incorrect - Adjusting as required.
Dirty fuel lines - Clean fuel lines.
Fuel tank air vent restricted or closed - Open or clean air vent.
Defective fuel pump - Repair or change fuel pump.
Worn or unadjusted choke cable - Replace cable or adjust properly.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
Valve timing is incorrect - Set the valve timing properly.
| Engine starts but stalls immediately |
Defective spark plug - Change spark plug as required.
Faulty or dirty carburetor - Carburetor needs to be replaced or cleaned.
Defective ignition coil - Ignition coil should be replaced.
Fuel tank air vent clogged or closed - Open or service air vent.
Defective fuel pump - Repair or change fuel pump.
Choke system malfunction - Inspect and replace choke system components.
Valve clearance is improper - Adjust valve clearance.
Wrong valve timing - Set the valve timing properly.
Valve springs are damaged or weak - New valve springs need to be installed.
Valves sticking - Clean the valves.
Defective ignition - Check ignition and replace faulty components.
Fuel pump is damaged or dirty - Service or change fuel pump.
Carburetor is not working properly - Inspect and adjust.
Fuel lines clogging - Fuel lines must be clean.
Closed or clogged fuel tank air vent - Open or clean air vent.
Fuel filter is clogged - Replace or clean fuel filter.
Worn gaskets - Replace gaskets.
Water intake is clogged - Need to wash or clean.
Choke system malfunction - Change choke system components as required.
Engine is under excessive load - Reduce the load.
Too lean carburetor mixture - Adjust carburetor correctly.
Ignition timing is incorrect - Ignition timing needs to be set properly.
Defective thermostat - Install new thermostat.
Defective water pump - Change water pump as required.
Propeller pitch or diameter incorrect - Install correct propeller.
Damaged or bent propeller - Replace propeller.
Outboard engine is mounted too high or too low - Position the engine correctly.
Low engine oil level - Add oil to the engine crankcase.
Oil pump malfunction - Replace oil pump.
Dirty water intake screen - Clean and wash as required.
Wrong valve setting - Adjust valves correctly.
| Abnormal engine knocking or noise |
Low octane fuel - Change fuel.
Engine is running overloaded - Load reducing is recommended.
Low idle speed setting is not correct - Adjust idling as required.
Fuel pump is damaged or dirty - Clean or replace fuel pump.
Main bearings or crankshaft wear - Change or repair worn components.
Cylinder bore or piston rings are worn - Change defective parts.
Dirty or incorrectly adjusted carburetor - Clean or correctly adjust carburetor.
Fuel pump is defective or dirty - Clean or install new fuel pump.
Ignition system malfunction - Test ignition and replace failed parts.
Cylinder head gasket is worn - Replace cylinder head gasket.
Powerhead parts are faulty - Replace defective components as required.
Valves are burned or stuck - Replace or clean valves.
Propeller selection improperly - Replace propeller.
Damaged or bent propeller - Replace propeller.
Outboard motor mounting height is set incorrectly - Adjust the engine to correct transom height.
Incorrect trim angle - Adjust trim angle.
Carburetor main jet is improperly adjusted - Adjust it correctly.
Spark plug is loose or defective - Re-tighten or change the spark plug.
Worn piston, rings, or sleeve - Change faulty components.
| Excessive motor vibration |
Damaged or bent propeller - Replace propeller.
Propeller shaft malfunction - Replace propeller shaft.
Weeds clogs the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten bolt.
Loose or faulty steering pivot Tighten or replace.
Low battery capacity - Recharge the battery.
Battery is draining quickly - Service or change the battery.
Faulty battery terminals or disconnected cables - Check cable connections and change or clean terminals.
Starter motor is damaged - Repair or install a new starter.
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