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| Home / Engines / Briggs and Stratton Engines / Briggs and Stratton 28M707 |
Briggs and Stratton 28M707 Problems
| Engine Model: Briggs and Stratton 28M707 |
| Engine Type: 4-cycle single cylinder OHV vertical shaft gasoline engine |
| Total Displacement: 23.9 cu.in (391 cc) |
| Rated Engine Power: 10 Hp (7.5 kW) at 3300 rpm |
| Fuel System: Float type carburetor with fixed main jet |
| Engine starts up hard or won't start |
Empty gas tank - Add fuel.
Improper fuel grade - Use correct fuel grade.
Air in fuel tank - Bleed fuel tank.
Spark plug wire is disconnected or loose - Check the spark plug wire connection, repair or replace.
Spark plug is damaged - Install new spark plug.
Fuel filter is plugged - Fuel filter needs to be replaced.
Defective safety switch - Replace if required.
Problems with carburetor adjustment - Adjust as required.
Low compression - Check and replace worn parts.
Damaged or incorrectly adjusted choke cable - Replace cable or adjust properly.
| Engine runs unevenly |
Plugged cooling fins - Clean and wash as required.
Defective ignition system - Inspect ignition system and change faulty parts.
Stuck or faulty throttle cable - Replace or clean the cable.
Clogged air filter - Service or replace air filter.
Dirty or damaged fuel pump - Service or replace fuel pump.
| Engine starts and then shuts off |
Spark plug is defective - Change spark plug as required.
Faulty or clogged carburetor - Service or repair carburetor.
Ignition coil is not working - Replace ignition coil as necessary.
Broken or bad valve springs - Replace valve springs.
Valves sticking - Service the valves.
| Engine overheated |
Low engine oil level - Need to add engine oil.
Excessive engine load - Load reducing is recommended.
Air intake screen is plugged - Wash or clean as required.
Too lean fuel mixture in carburetor - Use proper settings.
Wrong ignition timing - Set the ignition timing correctly.
Valve setting is incorrect - Set the valves properly.
| Engine knocks or noises |
Stale or low octane fuel - Change gasoline.
Excessive engine load - Load reducing is recommended.
Engine oil level is insufficient - Check and refill engine oil.
Low idle speed adjustment is incorrect - Adjust idle speed.
Dirty or faulty fuel pump - Service or change fuel pump.
Main bearings or crankshaft wear - Install new parts as as required.
Improper valve clearance - Adjustment procedure required.
Cylinder bore or piston rings are worn - Replace faulty components.
| Engine loses power |
Carburetor is incorrectly adjusted or dirty - Service or properly adjust carburetor.
Plugged air filter - Change or clean air filter.
Dirty or faulty fuel pump - Test fuel pump and change if necessary.
Defective ignition system - Inspect ignition system and change failed components.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Valves are burned or stuck - Service or change valves.
Push rod is bent or worn - Change push rod.
Worn cylinder block components - Defective parts need to be replaced.
Plugged oil filter (if equipped) - Clean or replace oil filter.
| Excessive fuel consumption |
Choke is not fully open - Check choke cable and adjust it.
Incorrect adjustment of carburetor main jet - Adjust the carburetor main jet properly.
Spark plug is loose or defective - Replace or tighten spark plug.
Valves are worn, burned or stuck - Clean or replace valves.
Rings, sleeve, or piston are damaged - Replace faulty parts.
Valve clearance is wrong - Adjust to proper valve clearance.
| Engine consuming too much oil |
Defective seals or gaskets - To repair leaks, replace worn parts.
Worn valve guides and valve stems - Change the valves.
Piston rings are seized or worn - Change the piston rings as required.
Worn piston or cylinder liner - Inspect piston and liner, change as required.
Breather pipe or hose is blocked - Service or change.
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