Briggs and Stratton 31G777 Problems
| Engine Model: Briggs and Stratton 31G777 |
| Engine Type: 4-cycle 1-cylinder overhead valve air-cooled gasoline |
| Total Displacement: 30.5 cu.in (500 cc) |
| Rated Engine Power: 17.5 Hp (13 kW) at 3300 rpm |
| Fuel System Type: Float carburetor |
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| Engine difficult to start or doesn't start |
No gasoline in tank - Add gasoline.
Low-quality gasoline - Use correct fuel grade.
Clogged fuel system - Remove clogging.
Spark plug wiring connection is defective - Inspect spark plug wiring connection, change or repair.
Faulty spark plug - Change spark plug as required.
Fuel filter is clogged - Replace fuel filter.
Safety contact for brake pedal defective - Install new part.
Carburetor is dirty - Wash, clean and adjust.
Weak cylinder compression - Inspect cylinder block and change worn parts.
Not adjusted or damaged throttle cable - Change cable or adjust properly.
Air intake grill is clogged - Need to clean or wash.
Ignition failure - Check ignition and replace faulty components.
Defective or stuck choke cable - Service or change the cable.
Air filter is dirty - Clean or change air filter.
Fuel pump is defective or dirty - Check fuel pump and change if required.
| Engine starts and stops suddenly |
Spark plug is faulty - Change spark plug as required.
Carburetor is faulty or dirty - Service or change carburetor.
Ignition coil is not working - Replace ignition coil as necessary.
Broken or bad valve springs - Install new valve springs.
Stuck valves - Valves must be cleaned.
Insufficient engine oil - Add oil to the engine crankcase.
Engine is running overloaded - Load reducing is recommended.
Cooling fins are blocked - Need to wash or clean.
Too lean fuel mixture in carburetor - Set the carburetor properly.
Improper ignition timing - Ignition timing needs to be set properly.
Wrong valve setting - Set the valves correctly.
Low octane gasoline - Change gasoline.
Engine is overloaded - Reduce load.
Not enough engine oil - Fill up the engine oil.
Wrong adjustment of low idle speed - Need to adjust idle speed.
Clogged or damaged fuel pump - Clean or replace fuel pump.
Main bearings or crankshaft failure - Change defective components as required.
Valve clearance is incorrect - Need to adjust valve clearance.
Piston rings or cylinder bore are damaged - Replace defective parts.
Carburetor is clogged or incorrectly adjusted - Adjust the carburetor correctly or clean it.
Air filter is blocked - Clean or replace air filter.
Fuel pump is defective or dirty - Service or replace fuel pump.
Ignition system malfunction - Inspect ignition system and change faulty parts.
Cylinder head gasket is damaged - Replace the head gasket.
Burned or stuck valves - Change or service valves.
Damaged or worn push rod - Replace push rod.
Worn cylinder block components - Change defective parts.
Oil filter element is clogged (if equipped) - Clean or replace oil filter.
| Excessive fuel consumption |
Insufficient throttle opening - Adjust or replace throttle cable.
Incorrect adjustment of carburetor main jet - Adjust the carburetor main jet properly.
Loose or defective spark plug - Tighten or replace spark plug.
Valves are worn, burned or stuck - Replace or clean valves.
Sleeve, piston, or rings are damaged - Replace faulty components as required.
Incorrect valve clearance - Adjustment procedure required.
| Excessive engine oil consumption |
Damaged gaskets or seals - Install new components.
Damaged valve stems or valve guides - Replace the valves.
Worn or broken piston rings - Change piston rings.
Scuffed cylinder liner or piston - Check liner and piston, replace as required.
Plugged breather pipe or hose - Change or clean.
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