The 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 | |
| Model | GX270 T2/UT2 |
| Description code | T2 (GCBHT), UT2 (GCBGT) |
| Type | 4-stroke, OVH, single cylinder, inclined by 25° |
| Displacement | 270 cm 3 (16.5 cu·in) |
| Max. horsepower | 8.6 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 |
| Carburetor | Horizontal type, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | C.D.I.(Capacitor Discharge Ignition) type magneto ignition |
| Lubricating system | Forced splash |
| Starting system | Recoil, Recoil and Starter motor |
| Stoping system | Ignition exciter coil circuit open |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel consumption | 2.4 Liters (0.63 US gal, 0.53 Imp gal) / h |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| GX270 T2 | GX270 UT2 | |||||||
| Type V | Type E | Type H | Type P | Type Q | Type S | Type V | Type R | |
| Length, mm (in) | 400 (15.7) |
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 (56.9) |
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) |
| Operating weight, kg (lb) |
30.5 (67.2) |
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 Stroke | 77 X 58 mm (3.0 x 2.3 in) | |
| Sleeve internal diameter | 77.000-77.017 mm (3.0315-3.0322 in) | |
| Piston skirt outer diameter | 76.975-76.985 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 diameter | 32.975-32.985 mm (1.2982-1.2986 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| 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
| Engine | |
| Maximum speed | 3,850 ± 150 rpm |
| Idle speed | 1,400 ± 150 rpm |
| Cylinder compression | 6.0-8.5 kg/cm2 (85-121 psi, 0.59 – 0.83 MPa) at 600 rpm |
| Valve clearance | |
| Intake valve | 0.15 ± 0.02 (0.006 ± 0.001) |
| Exhaust valve | 0.20 ± 0.02 (0.008 ± 0.001) |
| Carburetor | |
| Main jet | #88 |
| Float height | 13.2 mm (0.52 in) |
| Pilot screw opening | 2 turns out |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or later) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.1 liters (1.16 US.qts, 0.97 Imp. qts) |
| Ignition system | |
| Ignition timing | B.T.D.C. 10° / 1,400 rpm |
| Spark plug | NGK: BPR6ES DENSO: W20EPR-U |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Ignition coil air gap | 0.2-0.6 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:
i have a honda 3.5 Gx110 looking to replace with a Gx270 are the shaft on them the same.
What size is the shaft on a Honda GX279ut2
The Cylinder Head Has an M14 Screw, and Torque information is not available.