Honda GXV160

Honda GXV160The Honda GXV160 is a 163 cc (10.0 cu-in) single-cylinder air-cooled four-stroke internal combustion small gasoline engine with vertical shaft manufactured by Honda Motor Company for general-purpose applications, such as lawn mowers, commercial lawn and garden equipment, forestry equipment, construction and industrial equipment, agricultural equipment.

The Honda GXV160 engine has an OHV (overhead valve) design; high compression ratio for better fuel efficiency; horizontal type carburetor with butterfly valve; centrifugal mechanical governor; heavy-duty recoil or electric starter and transistorized magneto ignition system.

The cylinder bore is 68.0 mm (2.7 in) and the piston stroke is 45.0 mm (1.8 in), compression ratio rating is 8.0:1. The engine produced 5.5 HP (4.0 kW) of horsepower at 3,600 rpm and 10.8 Nm (1.1 kg·m, 7.96 ft·lb) of torque at 2,500 rpm.

General information

Engine Specifications
Type4-stroke, OHV, single cylinder
Displacement163 cm 3 (9.9 cu-in)
Max. horsepower5.5 HP (4.4 kW) at 3,600 rpm
Max. torque (crank PTO)10.8 Nm (1.1 kg·m, 7.96 ft·lb) at 2,500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemForced splash
Starting systemRecoil starter / Self starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity2.0 L (0.52 US qt)
Fuel consumption250 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

The Honda GXV160 has cast iron cylinder sleeve, ball bearing supported forged steel crankshaft, improved piston design. 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:8.0:1
Bore x Stroke68 X 45 mm (2.7 x 1.8 in)
Sleeve internal diameter68.000 mm (2.677 in)
Piston skirt outer diameter67.985 mm (2.6766 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop0.030-0.065 mm (0.0012-0.0026 in)
Second0.030-0.065 mm (0.0012-0.0026 in)
Ring end gapTop/Second0.20-0.40 mm (0.008-0.016 in)
Oil0.15-0.35 mm (0.006-0.014 in)
Ring widthTop/Second1.5 mm (0.06 in)
Oil2.5 mm (0.10 in)
Connecting rod small end ID18.005 mm (0.7087 in)
Connecting rod big end ID30.02 mm (1.182 in)
Piston pin outer diameter18.0 mm (0.7087 in)
Crankshaft crank pin outer diameter29.98 mm (1.180 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:OHV
Stem outer diameter (standard):INTAKE5.480 mm (0.216 in)
EXHAUST5.440 mm (0.214 in)
Valve spring free length:34.0 mm (1.339 in)
Camshaft outer diameter:13.984 mm (0.5506 in)
Cam height:INTAKE27.70 mm (1.09 in)
EXHAUST27.75 mm (1.093 in)

Tightening torque specs

Tightening torque specs
Connecting rod lower cap12 Nm; 1.2 kg·m; 9 ft·lb
Cylinder head bolt24 Nm; 2.4 kg·m; 17 ft·lb
Flywheel nut75 Nm; 7.5 kg·m; 54 ft·lb
Pivot adjusting nut10 Nm; 1.0 kg·m; 7 ft·lb
Pivot bolt24 Nm; 2.4 kg·m; 17 ft·lb
Oil filter extension10 Nm; 1.0 kg·m; 7 ft·lb
Oil drain bolt18 Nm; 1.8 kg·m; 13 ft·lb
Oil pan24 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

Service Information

Maximum speed3,200 ± 100 rpm
Idle speed1,700 ± 150 rpm
Cylinder compression5.0-8.0 kg/cm2 (71-114 psi) at 600 rpm
Valve clearance
Intake valve clearance0.15±0.02 mm (0.006±0.001 in)
Exhaust valve clearance0.20±0.02 mm (0.008±0.001 in)
Oil system
Oil typeHonda 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30
Oil capacity0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Main jet#70
Float height12.2-15.2 mm (0.48-0.60 in)
Pilot screw opening2 turns out
Ignition system
Ignition timing20° B.T.D.C. (Fixed)
Spark plugNGK: BP5ES, BPR5ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Primary ignition coil resistance0.7-0.9 Ω
Secondary ignition coil resistance6.3-7.7 kΩ
Ignition coil air gap0.4 ± 0.2 (0.016 ± 0.008)
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  1. Just a little confused as to Engine speed rated at 3200 RPM, and horse power rated at 3600RPM and my mower HRU216 using same motor is only generating 2800RPM at full throttle.
    In the words of the late Professor Julius Sumner Miller why is it so?

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