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Briggs and Stratton 31F707 Problems
| Engine Model: Briggs and Stratton 31F707 |
| Engine Type: 4-cycle single cylinder OHV vertical shaft gasoline engine |
| Total Displacement: 30.6 cu.in (501 cc) |
| Rated Engine Power: 17 Hp (12.7 kW) at 3600 rpm |
| Fuel System: Float type carburetor with fixed main jet |
| Engine starts hard or won't start |
Gas tank is empty - Fill gasoline up.
Wrong grade of gasoline - Use quality gasoline.
Dirty fuel system - Check and clean.
Spark plug wire connection are damaged - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Install new spark plug.
Dirty fuel filter - Change fuel filter.
Brake pedal not depressed - Press the brake pedal.
Carburetor incorrectly set - Set carb correctly.
Bad engine compression - Inspect cylinder block and replace worn components.
Damaged or incorrectly adjusted choke cable - Adjust correctly or replace the cable.
| Engine runs intermittently |
Cooling fins are plugged - Need to clean or wash.
Defective ignition system - Check ignition and replace faulty components.
Throttle cable is faulty or stuck - Change or service the cable.
Clogged air filter - Clean or change air filter.
Fuel pump is faulty or clogged - Test fuel pump and replace if necessary.
Damaged spark plug - Change spark plug.
Dirty or defective carburetor - Clean or change carburetor.
Ignition coil is faulty - Ignition coil must be replaced.
Valve springs are weak or broken - Valve springs need to be changed.
Valves sticking - Valves need to be cleaned.
Low engine oil level - Fill up the oil to required level.
Engine overloaded - Load reducing required.
Cooling fins are blocked - Need to wash or clean.
Carburetor is running lean - Make the correct settings.
Wrong ignition timing - Adjust ignition timing as required.
Valve setting is incorrect - Set the valves properly.
| Engine knocking sound or abnormal noise |
Stale or low octane fuel - Use correct fuel.
Engine overload - Reduce engine load.
Low engine oil level - Fill the crankcase with engine oil.
Incorrectly set low idle speed - Correct idle settings.
Fuel pump is dirty or defective - Check fuel pump and replace if necessary.
Crankshaft or main bearings wear - Install new parts as as required.
Valve clearance is wrong - Adjustment procedure required.
Piston rings or cylinder bore are worn - Change defective components.
| Engine power is insufficient |
Carburetor is dirty or improperly adjusted - Adjust carburetor properly or service it.
Air filter is blocked - Change or clean air filter.
Fuel pump is dirty or defective - Check fuel pump and replace if necessary.
Defective ignition - Inspect ignition system and change faulty parts.
Damaged cylinder-head gasket - Replace the gasket as required.
Stuck or burned valves - Clean or replace valves.
Push rod is damaged or worn - Replace push rod.
Faulty cylinder block parts - Replace defective components as required.
Dirty oil filter element (if equipped) - Replace or clean oil filter.
Throttle did not open fully - Replace or adjust throttle cable.
Incorrect carburetor main jet adjustment - Adjust it properly.
Spark plug is loose or defective - Re-tighten or change the spark plug.
Valves are worn, stuck, or burned - Clean or replace valves.
Sleeve, rings, or piston are damaged - Change faulty parts.
Valve clearance is not correct - Adjust valve clearance.
Worn seals or gaskets - Replace defective parts.
Worn valve stems and valve guides - Valves replacement required.
Stuck or defective piston rings - Have piston rings replaced.
Piston or cylinder liner is scored - Inspect piston and liner, change as required.
Breather hose or pipe is blocked - Change or service.
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