Tecumseh HS50 Troubleshooting
| Engine Model: Tecumseh HS50 |
| Engine Type: 4-cycle 1-cylinder L-head air-cooled gasoline |
| Total Displacement: 12 cu.in (197 cc) |
| Rated Engine Power: 5 Hp (3.7 kW) at 3600 rpm |
| Fuel System Type: Float carburetor with adjustable jet |
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| Engine hard to start or doesn't start |
Empty gas tank - Fill it up.
Wrong fuel grade - Change gasoline.
Air in the fuel system - Air bleeding.
Spark plug wire connection are damaged - Inspect the spark plug wire connection, replace or repair.
Spark plug is defective - Change spark plug.
Fuel filter is plugged - Replace fuel filter.
Faulty safety switch - Change damaged switch.
Carburetor is dirty - Wash, clean and adjust.
Engine has low compression - Check cylinder block and replace defective parts.
Damaged or incorrectly adjusted choke cable - Adjust properly or replace the cable.
Cooling fins are clogged - Clean and wash as required.
Ignition system problems - Check ignition system and replace faulty parts.
Defective or stuck choke cable - Replace or service the cable.
Air filter is dirty - Replace or clean air filter.
Clogged or defective fuel pump - Test fuel pump and change if necessary.
| Engine starts and then stalls |
Damaged spark plug - Replace spark plug.
Defective or dirty carburetor - Service or replace carburetor.
Damaged ignition coil - Change ignition coil as required.
Valve springs are broken or bad - Replace valve springs.
Valves are stuck - Clean the valves.
Lack of engine oil - Add oil to the engine crankcase.
Engine is under excessive load - Load reducing is recommended.
Cooling fins are clogged - Need to wash or clean.
Carburetor is running lean - Make the correct settings.
Improper ignition timing - Ignition timing needs to be set properly.
Valve setting is incorrect - Valves needs to be adjusted properly.
Stale gasoline - Change fuel.
Engine overload - Load reducing required.
Engine oil level low - Need to add engine oil.
Low idle speed adjustment is incorrect - Correct idle settings.
Dirty or faulty fuel pump - Check fuel pump and replace if necessary.
Main bearings or crankshaft wear - Replace crankshaft or bearings.
Valve clearance is not correct - Check and adjust.
Worn cylinder bore or piston rings - Change defective parts.
Carburetor is improperly adjusted or dirty - Clean or correctly adjust carburetor.
Clogged air filter - Clean or change air filter.
Clogged or defective fuel pump - Test fuel pump and change if necessary.
Ignition system problems - Inspect ignition system and change failed components.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Burned or stuck valves - Change or service valves.
Worn or damaged push rod - Push rod should be replaced.
Cylinder block components are damaged - Defective components need to be replaced.
Dirty oil filter element (if equipped) - Service or replace oil filter.
| Engine using too much gasoline |
Insufficient throttle opening - Adjust or replace throttle cable.
Improper carburetor main jet adjustment - Adjust main jet as required.
Spark plug is loose or faulty - Spark plug need to be replaced or tightened.
Valves are worn, stuck, or burned - Change or clean valves.
Worn piston, rings, or sleeve - Change defective components.
Valve clearance is not correct - Adjust to proper valve clearance.
| Excessive oil consumption |
Damaged seals or gaskets - New components need to be installed.
Valve stems or guides are damaged - Valves need to be changed.
Damaged or seized piston rings - Change the piston rings as required.
Cylinder liner or piston is damaged - Inspect liner and piston, fit new parts as necessary.
Breather hose or pipe is blocked - Service or change.
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