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| Home / Engines / Briggs and Stratton Engines / Briggs and Stratton 31C707 |
Briggs and Stratton 31C707 Problems
| Engine Model: Briggs and Stratton 31C707 |
| Engine Type: 4-cycle single cylinder OHV vertical shaft gasoline engine |
| Total Displacement: 30.6 cu.in (500 cc) |
| Rated Engine Power: 17.5 Hp (13 kW) at 3300 rpm |
| Fuel System: Float type carburetor with fixed main jet |
| Engine won't start or starts hard |
No fuel in fuel tank - Add gasoline.
Improper fuel grade - Use quality fuel.
Fuel system clogged - Repair or replace.
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair.
Spark plug is defective - Replace spark plug.
Dirty fuel filter - Replace fuel filter.
Brake pedal not depressed - Press the brake pedal.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Low engine compression - Inspect cylinder block and change defective components.
Choke cable is not adjusted properly or worn - Adjust correctly or replace the cable.
| Engine runs irregularly |
Air intake grill is clogged - Need to wash or clean.
Ignition failure - Test ignition and replace failed parts.
Throttle cable is stuck or faulty - Clean or replace the cable.
Clogged air filter - Change or clean air filter.
Fuel pump is clogged or faulty - Clean or change fuel pump.
| Engine starts and immediately shuts off |
Spark plug is faulty - Spark plug need to be replaced.
Carburetor is clogged or defective - Repair or clean carburetor.
Ignition coil is faulty - Change ignition coil as required.
Loose or worn valve springs - Valve springs need to be changed.
Stuck valves - Valves need to be cleaned.
| Engine overheats |
Not enough engine oil - Fill up the engine oil.
Excessive engine load - Reduce engine load.
Clogged cooling fins - Wash or clean as required.
Carburetor mixture is too lean - Make the correct settings.
Ignition timing is improper - Adjust ignition timing as required.
Improper valve setting - Set the valves correctly.
| Engine knocking sound or abnormal noise |
Low octane fuel - Use proper fuel.
Engine overloaded - Load reducing is recommended.
Not enough engine oil - Need to add engine oil.
Low idle speed setting is incorrect - Correct idle adjustment.
Fuel pump is damaged or dirty - Test fuel pump and change if necessary.
Worn main bearings or crankshaft - Have bearings or crankshaft replaced.
Improper valve clearance - Check and adjust.
Worn cylinder bore or piston rings - Replace faulty parts.
| Lack of engine power |
Carburetor is improperly adjusted or dirty - Service or properly adjust carburetor.
Air filter is blocked - Change or service air filter.
Fuel pump is dirty or defective - Clean or install new fuel pump.
Defective ignition system - Inspect ignition system and change failed components.
Worn cylinder head gasket - Replace cylinder head gasket.
Valves are stuck or burned - Service or change valves.
Worn or bent push rod - Replace push rod.
Damaged cylinder block components - Change defective components.
Plugged oil filter (if equipped) - Replace or service oil filter.
| Excessive fuel consumption |
Choke doesn't open well - Adjust or replace choke cable.
Improper adjustment of carburetor main jet - Adjust the carburetor main jet correctly.
Loose or faulty spark plug - Change or re-tighten spark plug.
Valves are stuck, burned, or worn - Clean or replace valves.
Worn sleeve, rings, or piston - Replace defective parts.
Improper valve clearance - Adjust to proper valve clearance.
| High engine oil consumption |
Damaged gaskets or seals - Replace defective parts.
Damaged valve guides or valve stems - Valves replacement required.
Worn or broken piston rings - Install new piston rings.
Piston or cylinder liner is scored - Check liner and piston, replace as required.
Breather pipe or hose is blocked - Service or replace.
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