________________________________________________________________________________________

Home / Engines / Honda Engines / Honda GXV120

Honda GXV120 Troubleshooting

Engine Model: Honda GXV120
Engine Type: 4-cycle overhead valve 1-cylinder air-cooled gasoline engine
Total Displacement: 7.2 cu.in (118 cc)
Rated Engine Power: 4 Hp (2.9 kW) at 3600 rpm
Fuel System: Horizontal carburetor with butterfly valve

Engine won't start or hard to start

Empty gas tank - Add gasoline.
Incorrect fuel grade - Use correct gasoline grade.
Dirty fuel lines - Inspect and clean.
Spark plug wire connection are damaged - Check spark plug wiring connection, repair or change.
Damaged spark plug - Spark plug need to be replaced.
Clogged fuel filter - Fuel filter needs to be replaced.
Brake pedal not depressed - Press the brake pedal.
Carburetor is dirty - Wash, clean and adjust.
Bad engine compression - Inspect cylinder block and replace worn components.
Worn or unadjusted choke cable - Replace cable or adjust properly.

Rough engine running

Cooling fins are plugged - Wash or clean as required.
Ignition system problems - Test ignition and replace failed parts.
Throttle cable is faulty or stuck - Replace or clean the cable.
Dirty air filter element - Replace or service air filter.
Fuel pump is dirty or defective - Clean or replace fuel pump.

Engine starts but stops suddenly

Defective spark plug - Spark plug need to be replaced.
Carburetor is dirty or faulty - Service or replace carburetor.
Ignition coil is defective - Replace ignition coil as necessary.
Valve springs are weak or broken - New valve springs need to be installed.
Stuck valves - Clean the valves.

Engine overheats

Not enough engine oil - Check and refill engine oil.
Engine is under excessive load - Load reducing required.
Cooling fins are clogged - Need to wash or clean.
Too lean fuel mixture in carburetor - Adjust carburetor properly.
Improper ignition timing - Adjust ignition timing correctly.
Incorrect valve setting - Valves needs to be adjusted properly.

Abnormal engine noise or knocking

Stale gasoline - Change fuel.
Excessive engine load - Reduce engine load.
Lack of engine oil - Check and refill engine oil.
Too low idle RPM - Adjust as required.
Fuel pump is defective or dirty - Inspect fuel pump and change as required.
Main bearings or crankshaft failure - Have bearings or crankshaft replaced.
Valve clearance is not correct - Check and adjust.
Cylinder bore or piston rings are worn - Replace defective parts.

Engine lacks power

Clogged or incorrectly adjusted carburetor - Adjust carburetor properly or service it.
Air filter is blocked - Change or clean air filter.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Ignition failure - Inspect ignition system and change failed components.
Cylinder head gasket is defective - Replace the gasket as required.
Stuck or burned valves - Replace or service valves.
Worn or defective push rod - Replace push rod.
Faulty cylinder block parts - Replace defective parts as required.
Oil filter is dirty (if equipped) - Change or clean oil filter.

Excessive fuel consumption

Choke opening is not full - Replace or adjust choke cable.
Incorrect carburetor main jet adjustment - Adjust main jet as required.
Faulty or loose spark plug - Spark plug need to be tightened or replaced.
Valves are worn, burned or stuck - Replace or clean valves.
Sleeve, rings, or piston are damaged - Change faulty components.
Valve clearance is improper - Adjustment procedure required.

High oil consumption

Gaskets or seals may be damaged - Install new components.
Valve guides or stems are damaged - Valves replacement required.
Stuck or worn piston rings - Piston rings need to be replaced.
Damaged cylinder liner or piston - Inspect piston and liner, fit new components as necessary.
Blocked breather pipe or hose - Change or service.

________________________________________________________________________________________

________________________________________________________________________________________

Engines Technical Specifications
BRIGGS 28S777 BRIGGS 31H777 BRIGGS 31P977 BRIGGS 31Q777
HONDA GC135 HONDA GCV160 HONDA GS190 HONDA GX340
KOHLER CH18S KOHLER CH680 KOHLER CV460S KOHLER SV735S
KUBOTA D1305 KUBOTA D1503 KUBOTA V1903 KUBOTA 2003T
MERCURY 150 MERCURY 175 XRI MARINER 135 MERCURY 200 EFI
KAWASAKI FH430V KAWASAKI FR600V KAWASAKI FX541V KAWASAKI FD611V
BMW M20B23 BMW M40B18 BMW M43B16 BMW M50B24TU
TOYOTA 3VZ-E TOYOTA 1AZ-FE TOYOTA 1G-FE TOYOTA 1JZ-GE
NISSAN HR12DE NISSAN A12 NISSAN A15 NISSAN CA18DET