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Honda GS190 Troubleshooting

Engine Model: Honda GS190
Engine Type: 4-cycle 1-cylinder air-cooled gasoline engine
Total Displacement: 11.4 (187 cc)
Rated Engine Power: 5.2 Hp (3.9 kW) at 3600 rpm
Carburetor Type: Horizontal, butterfly valve


Engine hard to start or will not start

No gasoline in tank - Add fuel.
Wrong grade of gasoline - Use quality gasoline.
Air trapped in fuel system - Bleed air.
Spark plug wire is disconnected or loose - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Change spark plug.
Fuel filter is dirty - Install new filter.
Defective safety switch - Replace if required.
Carburetor is clogged - Clean the carburetor.
Low cylinder compression - Check cylinder block and replace worn parts.
Improperly adjusted or worn throttle cable - Replace cable or adjust properly.

Unstable engine running

Plugged cooling fins - Need to clean or wash.
Ignition system problems - Check ignition and replace faulty components.
Stuck or defective choke cable - Service or change the cable.
Dirty air filter element - Replace or clean air filter.
Fuel pump is dirty or defective - Clean or install new fuel pump.

Engine starts and immediately shuts off

Damaged spark plug - Spark plug need to be replaced.
Defective or clogged carburetor - Service or change carburetor.
Faulty ignition coil - Change ignition coil as required.
Bad or broken valve springs - Replace valve springs.
Valves sticking - Service the valves.

Engine overheating

Engine oil level is low - Fill up the oil to required level.
Engine overloaded - Reduce load.
Air intake screen is plugged - Need to wash or clean.
Too lean carburetor mixture - Make the correct settings.
Improper ignition timing - Adjust ignition timing correctly.
Valve setting is wrong - Set the valves correctly.

Engine noises or knocks

Stale fuel - Use proper fuel.
Engine overloaded - Reduce engine load.
Low engine oil level - Fill up the oil to required level.
Too low idle RPM - Need to adjust idle speed.
Clogged or damaged fuel pump - Service or change fuel pump.
Worn crankshaft or main bearings - Have bearings or crankshaft replaced.
Improper valve clearance - Adjustment procedure required.
Cylinder bore or piston rings are worn - Replace faulty parts.

Low engine power

Carburetor is incorrectly adjusted or clogged - Adjust the carburetor properly or clean it.
Air filter element is clogged - Service or replace air filter.
Dirty or defective fuel pump - Test fuel pump and change if necessary.
Defective ignition system - Check ignition system and replace faulty parts.
Cylinder head gasket is worn - Install new head gasket.
Valves are stuck or burned - Service or replace valves.
Worn or damaged push rod - Install a new push rod.
Cylinder block components are faulty - Defective components need to be replaced.
Clogged oil filter (if equipped) - Change or clean oil filter.

Engine using too much gasoline

Choke did not open fully - Change or adjust choke cable.
Carburetor main jet adjustment is incorrect - Adjust main jet as required.
Spark plug is loose or faulty - Tighten or change the spark plug.
Valves are stuck, burned, or worn - Service or change valves.
Piston, sleeve, or rings are damaged - Change defective parts.
Improper valve clearance - Check and adjust.

Engine oil consumption is too high

Damaged gaskets or seals - Replace defective parts.
Damaged valve stems or valve guides - Valves replacement required.
Stuck or defective piston rings - Change piston rings.
Damaged piston or cylinder liner - Check liner and piston, replace as required.
Plugged breather pipe or hose - Change or service.