Honda GXV270

Honda GXV270 vertical shaft engineThe Honda GXV270 is a 0.27 l (270 cc, 16.5 cu-in) air-coolled single-cylinder four-stroke internal combustion small gasoline (petrol) engine with vertical shaft manufactured by Honda Motor Company for general-purpose applications, such as commercial lawn and garden equipment, construction and industrial equipment, agricultural equipment.

The GXV270 engine has an OHV design with two valves; sophisticated air intake system; large capacity, multi-chamber exhaust system. The engine is equipped with a centrifugal mechanical governor, horizontal type carburetor with butterfly valve, transistorized magneto ignition system and recoil or electric starter.

The cylinder bore is 77.0 mm (3.0 in) and the piston stroke is 58.0 mm (2.3 in), compression ratio rating is 7.8:1. The Honda GXV270 motor produces 8.6 PS (8.5 HP, 6.35 kW) at 3600 rpm and 18.0 Nm (1.8 kg·m, 13 ft·lb) of torque at 2500 rpm.

General information

Engine Specifications
Model GXV270
Type 4-stroke, OHV, single cylinder
Displacement 270 cm 3 (16.5 cu-in)
Max. horsepower 8.5 HP (8.6 PS, 6.35 kW) at 3600 rpm
Max. torque (crank PTO) 18.0 Nm (1.8 kg·m, 13 ft·lb) at 2,500 rpm
Carburetor Horizontal type, butterfly valve
Cooling system Forced-air
Ignition system Transistorized magneto ignition
Lubricating system Pressure and splash
Starting system Recoil or electric starter
Stoping system Ignition primary circuit ground
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 2.0 L (0.53 US gal, 0.44 lmp gal)
Fuel consumption 321 g/kWh (240 g/HPh, 0.53 lb/HPh)
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

Length, mm (in) 410 (16.1)
Width, mm (in) 385 (15.2)
Height, mm (in) 405 (15.9)
Dry weight, kg (lb) 28 (62)
weight, kg (lb)
30.5 (67.2)

Cylinder Block and Head

The Honda GXV270 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: 7.8
Bore x Stroke 77 X 58 mm (3.0 x 2.3 in)
Sleeve internal diameter 77.000 mm (3.031 in)
Piston skirt outer diameter 76.985 mm (3.0309 in)
Number of piston rings (compression / oil): 2 / 1
Ring side clearance Top/second/oil 0.015-0.045 mm (0.0006-0.0018 in)
Ring end gap Top/second 0.2-0.4 mm (0.01-0.02 in)
Oil 0.2-0.7 m (0.01-0.03 in)
Ring width Top/second 2.0 mm (0.08 in)
Crankshaft outer diameter 32.985 mm (1.2986 in)
Cylinder Head
Warpage (limit) 0.10 mm (0.004 in)
Valve Arrangement: Overhead valve
Valves: 2
Stem outer diameter (standard): INTAKE 6.590 mm (0.259 in)
EXHAUST 6.550 mm (0.258 in)
Cam height: INTAKE 33.00 mm (1.299 in)
EXHAUST 32.60 mm (1.283 in)
Camshaft outer diameter: 16.000 mm (0.6299 in)

Maintenance data

Maximum speed 3400 ± 150 rpm
Idle speed 1400 ± 150 rpm
Cylinder compression 6.0-8.5 kg/cm2 (85-151 psi) 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)
Main jet #85
Float height 11.9-14.5 mm (0.47-0.57 in)
Pilot screw opening 2-1/4 turns out
Oil system
Oil type Honda 4-stroke or an equivalent (SE or SF)
Recommended oil SAE 10W-40
Oil capacity 1.1 L (1.2 US gal, 1.0 lmp qt)
Ignition system
Ignition timing 20 ° B.T.D.C (Fixed)
Spark plug NGK: BPR5ES
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
Primary ignition coil resistance 0.7-0.9 Ω
Secondary ignition coil resistance 6.3-7.7 kΩ
Ignition coil air gap 0.4 ± 0.2 (0.016 ± 0.008)
Starter motor
Brush length 7.2 mm (0.28 in) limit: 3.5 mm (0.14 in)
Mica depth 1.0 mm (0.04 in) limit: 0.2 mm (0.01 in)

Tightening torque specs

Tightening torque specs
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
Pivot adjusting nut 10 Nm; 1.0 kg·m; 7 ft·lb
Push rod guide pivot bolt 24 Nm; 2.4 kg·m; 17 ft·lb
Oil pan bolt 24 Nm; 2.4 kg·m; 17 ft·lb
Air cleaner body cap nut 9 Nm; 0.9 kg·m; 6.5 ft·lb
Muffler mounting nut 24 Nm; 2.4 kg·m; 17 ft·lb
Exhaust pipe mounting nut 24 Nm; 2.4 kg·m; 17 ft·lb
Oil drain plug 45 Nm; 4.5 kg·m; 34 ft·lb
Cylinder head cover bolt 9 Nm; 0.9 kg·m; 6.5 ft·lb
Fuel tank bolt 24 Nm; 2.4 kg·m; 17 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
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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  1. Hello, I would like information about the engine Honda GXV270 – shaft diameter 25mm, price ..Slovakia..Thank you!

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