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| Home / Engines / Honda Engines / Honda GC135 |
Honda GC135 Troubleshooting
| Engine Model: Honda GC135 |
| Engine Type: 4-cycle overhead camshaft 1-cylinder air-cooled gasoline |
| Total Displacement: 8.2 cu.in (135 cc) |
| Rated Engine Power: 4 Hp (2.9 kW) at 3600 rpm |
| Fuel System: Horizontal carburetor with butterfly valve |
| Engine will not start or hard to start |
No fuel in fuel tank - Fill it up.
Wrong grade of gasoline - Change fuel.
Air in fuel system - Bleed fuel system.
Faulty spark plug wire connection - Check spark plug wiring connection, repair or change.
Spark plug is faulty - Change spark plug.
Fuel filter is clogged - Replace fuel filter.
Brake pedal not depressed - Press the brake pedal.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Poor compression - Inspect and replace wear parts.
Worn or unadjusted choke cable - Adjust correctly or change the cable.
| Rough engine running |
Cooling fins are clogged - Need to wash or clean.
Ignition system failure - Check ignition and replace faulty components.
Choke cable is defective or stuck - Clean or replace the cable.
Air filter is blocked - Replace or clean air filter.
Fuel pump is clogged or faulty - Clean or install new fuel pump.
| Engine starts but immediately stops |
Spark plug is faulty - Spark plug need to be replaced.
Carburetor is defective or dirty - Service or replace carburetor.
Ignition coil is not working - Ignition coil should be replaced.
Loose or worn valve springs - Install new valve springs.
Valves are stuck - Service the valves.
| Engine overheating |
Insufficient engine oil - Check oil level and add oil as required.
Engine overloaded - Reduce engine load.
Clogged cooling fins - Need to wash or clean.
Carburetor mixture is too lean - Use proper settings.
Ignition timing is incorrect - Set the ignition timing correctly.
Valve setting is wrong - Set the valves properly.
| Engine knocks or noises |
Stale fuel - Use proper fuel.
Engine is under excessive load - Reduce the load.
Not enough engine oil - Check oil level and add oil as required.
Too low idle RPM - Adjust idle speed.
Clogged or defective fuel pump - Check fuel pump and change if required.
Worn main bearings or crankshaft - Have bearings or crankshaft replaced.
Valve clearance is improper - Need to adjust valve clearance.
Worn piston rings or cylinder bore - Change defective parts.
| Engine power is too low |
Carburetor is dirty or incorrectly adjusted - Carburetor needs to be adjusted correctly or cleaned.
Dirty air filter element - Replace or service air filter.
Fuel pump is defective or dirty - Inspect fuel pump and change as required.
Defective ignition - Check ignition and replace faulty components.
Damaged cylinder-head gasket - Change cylinder head gasket.
Valves are burned or stuck - Replace or service valves.
Bent or worn push rod - Install a new push rod.
Worn cylinder block components - Replace defective parts as required.
Dirty oil filter element (if equipped) - Change or clean oil filter.
| Excessive fuel consumption |
Throttle opening is not full - Adjust or change throttle cable.
Incorrect adjustment of carburetor main jet - Adjust it correctly.
Loose or defective spark plug - Re-tighten or change the spark plug.
Burned, worn, or stuck valves - Clean or change valves.
Piston, sleeve, or rings are damaged - Change faulty components.
Incorrect valve clearance - Adjust valve clearance.
| Excessive engine oil consumption |
Gaskets or seals may be damaged - Replace defective parts.
Damaged valve guides or valve stems - Install new valves.
Piston rings are defective or worn - Change the piston rings as required.
Damaged piston or cylinder liner - Inspect piston and liner, change as required.
Breather pipe or hose is plugged - Clean or change.
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