Honda GX110

The Honda GX110 is a 107 cc (6.5 cu-in) single-cylinder, air-cooled, four-stroke cycle, internal combustion small gasoline engine manufactured by Honda Motor Company since 1983 for general-purpose applications.

This engine has an OHV design for increased efficiency and optimal power transfer, sophisticated air intake system, large capacity, multi-chamber exhaust system, heavy-duty recoil starter.

A 57.0 mm (2.24 in) cylinder bore and 42.0 mm (1.65 in) piston stroke give the engine a total of 107 cc (6.5 cu-in) of displacement. The compression ratio rating is 8.7:1. This engine produces 3.5 PS (2.6 KW; 3.5 HP) at 4,000 rpm of maximum horsepower and 6.68 N·m (0.7 kg·m, 5.2 ft·lb) at 2,800 rpm of peak torque.

General information

Engine Specifications
Model	GX110
Type	4-stroke, OHV, single cylinder, inclined by 25°
Displacement	107 cm 3 (6.5 cu-in)
Max. horsepower	3.5 PS (2.6 KW; 3.5 HP) at 4,000 rpm
Max. torque (crank PTO)	6.68 N·m (0.7 kg·m, 5.2 ft·lb) at 2,800 rpm
Carburetor	Horizontal type, butterfly valve
Cooling system	Forced-air
Ignition system	Transistorized magneto ignition
Lubricating system	Splash type
Starting system	Recoil starter
Stoping system	Ignition primary circuit ground
Fuel used	Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity	2.5 liters (0.7 US gal, 0.5 Imp. gal)
Fuel consumption	230 g/HPh
PTO shaft rotation	Counterclockwise (from PTO shaft side)

Dimensions and Weight

	GX110 “Q” TYPE-CYCLONE AIR CLEANER
Length, mm (in)	320 (12.6)
Width, mm (in)	345 (13.6)
Height, mm (in)	320 (12.6)
Dry weight, kg (lb)	12.0 (25.6)

Cylinder Block and Head

The Honda GX110 has cast iron cylinder sleeve, ball bearing supported crankshaft, improved piston design, heavy-duty balancer shaft.

Cylinder block
Compression ratio:		8.7:1
Bore x Stroke		57.0 mm X 42.0 mm (2.24 x 1.65 in)
Sleeve internal diameter		57.000-57.015 mm (2.2440-2.2447 in)
Piston skirt outer diameter		56.965-56.985 mm (2.2427-2.2435 mm)
Number of piston rings (compression / oil):		2 / 1
Piston ring side clearance (Top):		0.015-0.045 mm (0.0006-0.0018 in)
Piston ring side clearance (Second):		0.015-0.045 mm (0.0006-0.0018 in)
Piston ring end gap (Top):		0.200-0.400 mm (0.0079-0.0157 in)
Piston ring end gap (Second):		0.200-0.400 mm (0.0079-0.0157 in)
Piston ring end gap (Oil):		0.150-0.350 mm (0.006-0.0137 in)
Ring width (Top):		1.500 mm (0.059 in)
Ring width (Second):		1.500 mm (0.059 in)
Ring width (Oil):		2.500 mm (0.98 in)
Piston pin outer diameter:		12.994-13.000 mm (0.5115-0.5118 in)
Crankshaft main journal diameter:		26.0 mm (1.02362 in)
Cylinder Head
Warpage (limit)		0.10 mm (0.004 in)
Valve Arrangement:		OHV
Valves:		2
Valve stem outer diameter (INTAKE):		5.468-5.480 mm (0.2152-0.2157 in)
Valve stem outer diameter (EXHAUST):		5.425-5.440 mm (0.2135-0.2141 in)
Camshaft cam height (INTAKE):		27.700 mm (1.0905 in)
Camshaft cam height (EXHAUST):		27.750 mm (1.0925 in)
Camshaft journal diameter:		14.000 mm (0.5511 in)

Service Information

Engine
Maximum speed	4,000 ± 150 rpm
Idle speed	1,400 ± 150 rpm
Cylinder compression	6.0-8.5 kg/cm2 (85-151 psi) at 600 rpm
Carburetor
Type	Horizontal type, butterfly valve
Main jet	#60
Float height	13.7±1.5 mm (0.54±0.06 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-30
Oil capacity	0.6 liters (0.63 US.qts, 0.53 Imp. qts)
Ignition system
Spark plug	NGK: BPR6ES NIPPONDENSO: W20EPR-U
Ignition timing	B.T.D.C. 25° / 1,400 rpm
Spark plug gap	0.7-0.8 mm (0.028-0.031 in)
Ignition coil air gap	0.2-0.6 mm (0.01-0.02 in)

Engine applications

• Pressure washers
• Commercial lawn and garden equipment
• Tillers / cultivators
• Generators
• Construction / industrial equipment
• Agricultural equipment
• Small vehicles
• Water pumps