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| Home / Engines / Briggs and Stratton Engines / Briggs and Stratton 31N707 |
Briggs and Stratton 31N707 Problems
| Engine Model: Briggs and Stratton 31N707 |
| Engine Type: 4-cycle single cylinder OHV vertical shaft gasoline engine |
| Total Displacement: 30.6 cu.in (500 cc) |
| Rated Engine Power: 18.5 Hp (13.7 kW) at 3600 rpm |
| Fuel System: Float type carburetor with fixed main jet |
| Engine hard to start or won't start |
Empty gas tank - Fill it up.
Wrong grade of gasoline - Use quality fuel.
Air trapped in fuel system - Bleed air.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Defective spark plug - Change spark plug.
Clogged fuel filter - Fuel filter needs changing.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor is not working properly - Inspect and adjust.
Engine has low compression - Check cylinder block and replace defective parts.
Damaged or incorrectly adjusted choke cable - Adjust correctly or replace the cable.
| Engine runs irregularly |
Plugged cooling fins - Need to wash or clean.
Defective ignition - Inspect ignition system and change failed components.
Defective or stuck throttle cable - Service or change the cable.
Air filter is dirty - Service or change air filter.
Fuel pump is dirty or defective - Service or change fuel pump.
| Engine starts and immediately shuts off |
Spark plug is damaged - Spark plug need to be replaced.
Carburetor is faulty or dirty - Replace or service carburetor.
Ignition coil is damaged - Ignition coil should be replaced.
Broken or loose valve springs - Valve springs need to be changed.
Stuck valves - Valves must be cleaned.
| Engine overheating |
Not enough engine oil - Check oil level and add oil as required.
Engine overloaded - Reduce load.
Cooling fins are blocked - Need to wash or clean.
Carburetor is running lean - Use proper settings.
Bad ignition timing - Adjust ignition timing correctly.
Valve setting is wrong - Adjust valves as required.
| Engine knocking or noise |
Stale gasoline - Use proper fuel.
Engine overload - Reduce engine load.
Insufficient engine oil - Check oil level and add oil as required.
Improperly adjusted low idle speed - Correct the settings.
Fuel pump is clogged or faulty - Inspect fuel pump and change as required.
Worn main bearings or crankshaft - Crankshaft or bearings need to be replaced.
Excessive valve clearance - Adjust valve clearance.
Piston rings or cylinder bore are worn - Replace faulty parts.
| Engine lacks power |
Carburetor is clogged or incorrectly adjusted - Clean or properly adjust carburetor.
Clogged air filter - Service or change air filter.
Fuel pump is dirty or defective - Check fuel pump and replace if necessary.
Defective ignition system - Inspect ignition system and change failed components.
Blown cylinder head gasket - Install new cylinder head gasket.
Valves are burned or stuck - Service or change valves.
Push rod is bent or worn - Change push rod.
Worn cylinder block parts - Replace defective components as required.
Clogged oil filter (if equipped) - Change or service oil filter.
| High fuel consumption |
Insufficient choke opening - Inspect choke cable and adjust as required.
Carburetor main jet is improperly adjusted - Adjust it properly.
Defective or loose spark plug - Spark plug need to be tightened or replaced.
Valves are worn, burned or stuck - Change or service valves.
Rings, sleeve, or piston are damaged - Replace faulty components.
Incorrect valve clearance - Adjust to proper valve clearance.
| Engine using too much oil |
Seals or gaskets are wearing excessively - New components need to be installed.
Worn valve guides and valve stems - Install new valves.
Damaged or seized piston rings - Change the piston rings as required.
Scuffed cylinder liner or piston - Inspect liner and piston, replace as necessary.
Blocked breather hose or pipe - Change or clean.
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