Honda GX270 K1

Honda GX270 K1 engineThe 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: 0.13-0.17 mm (0.0051-0.0067 in)
Exhaust valve clearance: 0.18-0.22 mm (0.0071-0.0087 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 EC3600, EC4000

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