Honda GX270 T2/UT2

Honda GX270The Honda GX270 T2/UT2 is a 270 cc (16.5 cu·in) single-cylinder, air-cooled, four-stroke cycle, internal combustion small gasoline engine with horizontal shaft, manufactured by Honda Motor for general-purpose applications.

From spring 2010 onwards, Honda producing the updated version of GX270 engines. This engine meets the most stringent exhaust gas emission regulation, EPA Phase III.

New GX270 has variable ignition timing (digital CDI), increased compression ratio, improved carburetor performance, and a lightweight piston. As a result, it increased power and torque levels with improved fuel efficiency, and a further reduction in noise and vibration levels.

The dimensions and outward appearance, however, remained virtually unchanged, in order to guarantee 100% interchangeability with the older GX270-engines. For the same reason, the naming of the engine remained unchanged, but all new engines have a number “2” in model version (T2 or UT2), old versions have a number “1” (GX270 K1/T1/UT1).

In 2014, Honda introduced “high inclination” version of GX engines. The GX270, GX340 and GX390 are now available for multi-purpose uses including providing power for two-wheel tractors.

The engines have new features:

  • A special one-way valve integrated in the cylinder head to improve the oil return flow and guarantee optimal lubrication under inclined conditions;
  • A membrane fuel pump, protected by a bracket, and adapted fuel line routing, to ensure an optimal fuel flow;
  • A maximum fuel level indicator and inner-vent carburettor fitted to avoid overfilling and to guarantee safe operation under all conditions.

The Honda GX270 T2/UT2 produces 8.6 PS (6.3 KW; 8.4 HP) at 3,600 rpm and 19.1 Nm (1.94 kg·m, 14.1 ft·lb) of torque at 2500 rpm.

PTO Shaft Options

  • E type – tapered shaft;
  • H type – 1/6 reduction type PTO;
  • L type – 1/2 reduction type PTO;
  • P type – threaded type (SAE);
  • Q type – straight shaft;
  • R type – 1/2 reduction type PTO with centrifugal clutch;
  • V type – tapered shaft;

General information

Engine Specifications
ModelGX270 T2/UT2
Description codeT2 (GCBHT), UT2 (GCBGT)
Type4-stroke, OVH, single cylinder, inclined by 25°
Displacement270 cm 3 (16.5 cu·in)
Max. horsepower8.6 PS (6.3 KW; 8.4 HP) at 3,600 rpm
Max. torque (crank PTO)19.1 Nm (1.95 kg·m; 14.1 lbf·ft) at 2,500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemC.D.I.(Capacitor Discharge Ignition) type magneto ignition
Lubricating systemForced splash
Starting systemRecoil, Recoil and Starter motor
Stoping systemIgnition exciter coil circuit open
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel consumption2.4 Liters (0.63 US gal, 0.53 Imp gal) / h
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

GX270 T2GX270 UT2
Type VType EType HType PType QType SType VType R
Length, mm (in)400
340 (13.4)425 (16.7)380 (15.0)380 (15.0)355 (14.0)400 (15.7)440 (17.3)
Width, mm (in)428 (16.9)
Height, mm (in)422 (16.6)
Dry weight, kg (lb)25.8
25.0 (55.1)26.5 (58.4)25.8 (56.9)25.8 (56.9)25.8 (56.9)25.8 (56.9)30.0 (66.1)
weight, kg (lb)
39.7 (65.5)31.5 (69.4)30.5 (67.2)30.5 (67.2)30.5 (67.2)30.5 (67.2)35.0 (77.2)

Cylinder Block and Head

The Honda GX270 has cast iron cylinder sleeve, ball bearing supported crankshaft, improved piston design, heavy duty balancer shaft. The piston has two compression rings and one oil ring. Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency.

Cylinder block
Compression ratio:8.5:1
Bore x Stroke77 X 58 mm (3.0 x 2.3 in)
Sleeve internal diameter77.000-77.017 mm (3.0315-3.0322 in)
Piston skirt outer diameter76.975-76.985 mm (3.0305-3.0309 mm)
Number of piston rings (compression / oil):2 / 1
Piston ring side clearance (Top):0.030-0.060 (0.0012-0.0024)
Piston ring side clearance (Second):0.030-0.060 (0.0012-0.0024)
Piston ring end gap (Top):0.200-0.350 mm (0.0079-0.0138 in)
Piston ring end gap (Second):0.350-0.500 mm (0.0138-0.0197 in)
Piston ring end gap (Oil – side rail):0.200-0.700 mm (0.0079-0.0276 in)
Ring width (Top):1.160-1.175 mm (0.0457-0.0463 in)
Ring width (Second):1.160-1.175 mm (0.0457-0.0463 in)
Crankshaft outer diameter32.975-32.985 mm (1.2982-1.2986 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Valve stem outer diameter (INTAKE):6.575-6.590 mm (0.2589-0.2594 in)
Valve stem outer diameter (EXHAUST):6.535-6.550 mm (0.2573-0.2579 in)
Camshaft cam height (INTAKE):31.945-32.145 mm (1.2577-1.2655 in)
Camshaft cam height (EXHAUST):31.666-31.866 mm (1.2467- 1.2546 in)
Camshaft outer diameter:15.966-15.984 mm (0.6286- 0.6293 in)

Maintenance data

Maximum speed3,850 ± 150 rpm
Idle speed1,400 ± 150 rpm
Cylinder compression6.0-8.5 kg/cm2 (85-121 psi, 0.59 – 0.83 MPa) at 600 rpm
Valve clearance
Intake valve0.15 ± 0.02 (0.006 ± 0.001)
Exhaust valve0.20 ± 0.02 (0.008 ± 0.001)
Main jet#88
Float height13.2 mm (0.52 in)
Pilot screw opening2 turns out
Oil system
Oil typeHonda 4-stroke or an equivalent (SE or later)
Recommended oilSAE 10W-30
Oil capacity1.1 liters (1.16 US.qts, 0.97 Imp. qts)
Ignition system
Ignition timingB.T.D.C. 10° / 1,400 rpm
Spark plugNGK: BPR6ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap0.2-0.6 mm (0.0079-0.0236 in)
Starter motor
Brush length 7.0 mm (0.28 in)
Limit: 3.5 mm (0.14 in)
Mica depth 1.0 mm (0.04 in)
Limit: 0.2 (0.01)

Tightening torque specs

Tightening torque specs
Connecting rod bolt (M8x1.25 Special)14 Nm; 1.4 kg·m; 10 ft·lb
Cylinder head bolt (M10x1.25)35 Nm; 3.5 kg·m; 25 ft·lb
Flywheel nut (M16x1.5 Special)115 Nm; 11.5 kg·m; 83 ft·lb
Rocker arm pivot lock nut (M6x0.5)10 Nm; 1.0 kg·m; 7 ft·lb
Rocker arm pivot bolt (M8x1.25 Special)24 Nm; 2.4 kg·m; 17 ft·lb
Crankcase cover bolt (M8x1.25)24 Nm; 2.4 kg·m; 17 ft·lb
Oil level switch joint nut (M10x1.25)10 Nm; 1.0 kg·m; 7 ft·lb
Fuel filter joint nut (M10x1.25)2 Nm; 0.2 kg·m; 1.4 ft·lb
Muffler mounting nut (M8x1.25)24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner wing nut (M6x1.0)9 Nm; 0.9 kg·m; 6.5 ft·lb
Oil drain bolt (M12x1.5)23 Nm; 2.3 kg·m; 17 ft·lb
Fuel tank bolt (M8x1.25)24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner mounting nut (M6x1.0)10 Nm; 1.0 kg·m; 7 ft·lb
Fuel strainer cup (M24x1.0)4 Nm; 0.4 kg·m; 2.9 ft·lb
Standard torque values
Bolt, nut (5 mm)5.5 Nm; 0.55 kg·m; 4.0 ft·lb
Bolt, nut (6 mm)10 Nm; 1.0 kg·m; 7 ft·lb
Bolt, nut (8 mm)24 Nm; 2.4 kg·m; 17 ft·lb
Bolt, nut (10 mm)37.5 Nm; 3.75 kg·m; 27 ft·lb
Bolt, nut (12 mm)55 Nm; 5.5 kg·m; 40 ft·lb

Engine applications

  • Pressure washers
  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Generators
  • Construction / industrial equipment
  • Agricultural equipment
  • Small vehicles
  • Water pumps
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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