The Honda GX270 K1/T1/UT1 is a 270 cc, (16.5 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company for general-purpose applications, such as construction equipment, tillers, generators, welders, pumps and other industrial applications.
The Honda GX270 K1 engine has a single-cylinder inclined by 25°, overhead valve (OHV) design, horizontal type carburetor with butterfly valve, transistorized magneto ignition system, mechanical splash type lubricating system and forced-air cooling system. The GX270 K1 engine could be equipped with a single element type, dual-element type, oil-bath type or a cyclone-type air cleaner. The GX270 K1 used a 6.0 L (1.59 US. gal. 1.32 Imp. gal.) fuel tank.
The Honda GX270 engine produced 9.1 PS (6.7 kW; 9.0 HP) at 3,600 rpm of maximum output power and 19.5 N·m (2 kg·m, 14.4 ft·lb) at 2,500 rpm of peak torque.
Engine models with other features were also available:
- H type – 1/6 reduction type PTO, this version produced 102.0 N·m (10.2 kg·m, 74 ft·lb) at 420 rpm of peak torque;
- L type – 1/2 reduction type PTO, it produced 34.0 N·m (3.4 kg·m, 24 ft·lb) at 1,250 rpm of torque;
- R type – 1/2 reduction type PTO with the centrifugal clutch.
General information
| Engine Specifications | |
| Engine model | GX270 K1/T1/UT1 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 270 cm3, (16.5 cu·in) |
| Max. horsepower | 9.1 PS (6.7 kW; 9.0 HP) at 3,600 rpm |
| Max. torque | 19.5 N·m (2 kg·m, 14.4 ft·lb) at 2,500 rpm |
| Cooling system | Forced air |
| Air cleaner | Dual element type; Single element type; Oil-bath type; Cyclone type; |
| Lubricating system | Splash type |
| Ignition system | Transistorized magneto ignition |
| Fuel system | Horizontal type carburetor with butterfly valve |
| Fuel consumption | 313 g/kWh |
| Fuel tank capacity | 6.0 L (1.59 US. gal. 1.32 Imp. gal.) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Recoil or electric starter |
| Stoping system | Ignition primary circuit ground |
| Governor | Centrifugal govervor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | Type S:355 x 430 x 410 mm (14 x 16.9 x 16.1 in) |
| Dry weight | Type S:25.0 kg (55.1 lbs) |
Cylinder Block and Head
The cylinder bore is 77.0 mm (3.03 in) and the piston stroke is 58.0 mm (2.28 in). The compression ratio rating is 8.2:1. The Honda GX270 K1 engine has a cast iron cylinder sleeve, ball bearing supported the crankshaft and heavy-duty balancer shaft. The piston has two compression rings and a single oil ring.
| Cylinder block | |
| Compression ratio: | 8.2:1 |
| Cylinder bore: | 77.0 mm (3.03 in) |
| Piston stroke: | 58.0 mm (2.28 in) |
| Cylinder internal diameter (standard): | 77.000 mm (3.0315 in) |
| Piston skirt outer diameter (standard): | 76.985 mm (3.0309 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Connecting rod big end diameter (standard): | 33.025 mm (1.3002 in) |
| Connecting rod small end diameter (standard): | 18.005 mm (0.7089 in) |
| Piston pin diameter: | 18.000 mm (0.7087 in) |
| Side clearance (Top): | 0.015-0.045 mm (0.0006-0.0018 in) |
| Side clearance (Second): | 0.015-0.045 mm (0.0006-0.0018 in) |
| Ring end gap (Top): | 0.20-0.40 mm (0.0079-0.0157 in) |
| Ring end gap (Second): | 0.20-0.40 mm (0.0079-0.0157 in) |
| Ring end gap (Oil): | 0.20-0.70 mm (0.0079-0.0276 in) |
| Ring width (Top): | 2.0 mm (0.0787 in) |
| Ring width (Second): | 2.0 mm (0.0787 in) |
| Crankpin journal diameter: | 32.985 mm (1.2986 in) |
| Crankshaft center distance: | 29 mm (1.14 in) |
| Cylinder head | |
| Valve arrangement: | OHV, gear driven |
| Valves:: | 2 |
| Valve steam diameter (INTAKE): | 6.59 mm (0.2594 in) |
| Valve steam diameter (EXHAUST): | 6.59 mm (0.2594 in) |
| Valve spring free length (INTAKE): | 39.0 mm (1.5354 in) |
| Valve spring free length (EXHAUST): | 39.0 mm (1.5354 in) |
| Camshaft lobe height (INTAKE): | 31.52-31.92 mm (1.2409-1.2567 in) |
| Camshaft lobe height (EXHAUST): | 31.56-31.96 mm (1.2425-1.2583 in) |
| Camshaft journal diameter : | 15.984 mm (0.6293 in) |
Tightening torque
| Tightening torque settings | |
| Connecting rod bolt: | 14 Nm; 1.4 kg·m; 10 ft·lb; |
| Cylinder head bolt: ; | 35 Nm; 3.5 kg·m; 25 ft·lb |
| Flywheel nut: | 115 Nm; 11.5 kg·m; 83 ft·lb; |
| Rocker arm pivot lock nut: | 10 Nm; 1.0 kg·m; 7 ft·lb; |
| Rocker arm pivot bolt: | 24 Nm; 2.4 kg·m; 17 ft·lb; |
| Oil drain bolt: | 23 Nm; 2.3 kg·m; 17 ft·lb |
Service Data
The Honda 4-stroke or an equivalent (SG.SF/CC.CD) SAE 10W-30 engine oil, is recommended for the GX270. Refilling oil capacity is 1.1 L (1.16 US. qt, 0.97 Imp. qt.). Recommended spark plug is NGK: BP6ES, BPR6ES, NIPPONDENSO: W20EP-U, W20EPR-U with 0.7-0.8 mm (0.0276-0.0315 in) spark plug gap.
The intake and exhaust valve clearance is 0.13-0.17 mm (0.0051-0.0067 in). Standard cylinder compression is 6.0-8.0 kg/cm2 (85-121 psi) at 600 rpm.
| Engine | |
| Maximum speed: | 3,850±150 rpm |
| Idle speed: | 1,400 ±150 rpm rpm |
| Cylinder compression: | 6.0-8.0 kg/cm2 (85-121 psi) at 600 rpm |
| Valve clearance | |
| Intake valve clearance: | 0.15 ± 0.02 mm (0.006 ± 0.001 in) |
| Exhaust valve clearance: | 0.20 ± 0.02 mm (0.008 ± 0.001 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | Honda 4-stroke or an equivalent (SG.SF/CC.CD) |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 1.1 L (1.16 US. qt, 0.97 Imp. qt.) |
| Reduction oil capacity (centrifugal clutch): | 0.3 L (0.32 US. qt, 0.26 Imp. qt.) |
| Fuel system | |
| Type: | Horizontal type carburetor with butterfly valve |
| Main jet: | Externally vented carb: #88 Internally vented carb: #95 |
| Float height: | 13.2 mm (0.5197 in) |
| Pilot screw opening: | Externally vented: 2-7/8 turns out Internally vented: 2 turns out |
| Ignition system | |
| Type: | Transistorized magneto ignition |
| Ignition timing: | B.T.D.C. 20° (Fixed) |
| Spark plug: | NGK: BP6ES, BPR6ES NIPPONDENSO: W20EP-U, W20EPR-U |
| Spark plug gap: | 0.7-0.8 mm (0.0276-0.0315 in) |
| Ignition coil air gap | 0.2-0.6 mm (0.0079-0.0079 in) |
Applications
| Manufacturer or Brand | Models |
| Generators | |
| Honda | EB4000X, EC3600, EC4000 |
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