Briggs and Stratton 31H777 Problems
| Engine Model: Briggs and Stratton 31H777 Intek |
| Engine Type: 4-cycle 1-cylinder overhead valve air-cooled gasoline |
| Total Displacement: 30.5 cu.in (502 cc) |
| Rated Engine Power: 18 Hp (13.3 kW) at 3600 rpm |
| Fuel System Type: Float carburetor |
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| Engine starts hard or won't start |
Fuel tank is empty - Fill gasoline up.
Wrong grade of gasoline - Use quality gasoline.
Air in fuel system - Bleed fuel system.
Disconnected or loose spark plug wire - Check the spark plug wire connection, repair or replace.
Spark plug is damaged - Replace spark plug.
Clogged fuel filter - Fuel filter needs changing.
Defective safety switch - Replace if required.
Carburetor is not working properly - Inspect and adjust.
Bad compression - Check and change damaged parts.
Throttle cable is damaged or adjusted incorrectly - Replace cable or adjust correctly.
Cooling fins are blocked - Need to wash or clean.
Defective ignition - Inspect ignition system and change failed components.
Stuck or defective throttle cable - Service or replace the cable.
Air filter element is plugged - Service or change air filter.
Dirty or damaged fuel pump - Inspect fuel pump and change as required.
| Engine starts but then shuts off |
Damaged spark plug - Replace spark plug.
Clogged or faulty carburetor - Service or repair carburetor.
Ignition coil is defective - Install a new ignition coil.
Broken or loose valve springs - Change valve springs.
Valves sticking - Service the valves.
Not enough engine oil - Checking oil level and add if necessary.
Engine overloaded - Load reducing required.
Cooling fins are clogged - Need to clean or wash.
Carburetor mixture is too lean - Use proper settings.
Bad ignition timing - Adjust ignition timing correctly.
Improper valve setting - Valves needs to be set correctly.
Stale gasoline - Use proper fuel.
Engine overloaded - Load reducing required.
Lack of engine oil - Fill up the oil to required level.
Low idle speed set incorrectly - Correct idle adjustment.
Fuel pump is clogged or faulty - Service or change fuel pump.
Crankshaft or main bearings failure - Have bearings or crankshaft replaced.
Valve clearance is wrong - Adjustment procedure required.
Damaged piston rings or cylinder bore - Replace faulty components.
Dirty or improperly adjusted carburetor - Service or properly adjust carburetor.
Air filter element is plugged - Change or service air filter.
Fuel pump is clogged or faulty - Inspect fuel pump and change as required.
Ignition system is defective - Check ignition system and replace faulty parts.
Defective cylinder head gasket - Install new head gasket.
Valves are burned or stuck - Service or change valves.
Worn or defective push rod - Install a new push rod.
Cylinder block components are worn - Change defective components.
Oil filter is blocked (if equipped) - Change or clean oil filter.
| Engine using too much gasoline |
Choke doesn't open well - Adjust or replace choke cable.
Carburetor main jet is improperly adjusted - Adjust main jet as required.
Spark plug is loose or defective - Re-tighten or replace spark plug.
Stuck, burned, or worn valves - Change or service valves.
Worn sleeve, piston, or rings - Replace faulty components.
Excessive valve clearance - Adjust to proper valve clearance.
| Engine consuming too much oil |
Damaged seals or gaskets - Worn parts need to be replaced.
Valve stems or guides are damaged - Replace defective valves.
Stuck or worn piston rings - Piston rings replacement required.
Damaged cylinder liner or piston - Check piston and liner, replace as required.
Plugged breather hose or pipe - Replace or clean.
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