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Honda GX22 Engine

The Honda GX22 is a four-stroke overhead valve single cylinder horizontal shaft air-cooled small gasoline engine from GX-series. A 1.3 cu. in (22 cc) engine has a cylinder bore of 1.30" (33 mm), piston stroke of 1.02" (26 mm), and rated power of 1 Hp (0.75 kW) at 7000 rpm. The compression ratio rating is 8.0:1. The Honda GX22 engine is equipped with a pumping spray lubrication system, diaphragm type carburetor, transistorized magneto ignition system, and recoil starter. The operating weight is 7.3 lbs (3.3 kg).

General Technical Data

Engine Specifications

Engine Model ................. Honda GX22
Engine Type ................. 4-cycle 1-cylinder OHV air-cooled gasoline
Number of Cylinders ................. Single
Displacement, cu.in (cc) ................. 1.3 (22.0)
Cylinder Bore, in (mm) ................. 1.30 (33.0)
Piston Stroke, in (mm) ................. 1.02 (26.0)
Rated Engine Power, hp (kW) ................. 1.0 (0.75)
Rated Engine Speed, rpm ................. 7000
Idle Speed, rpm ................. 3100±200
Maximum Torque, Nm (ft-lbs) ................. 1.09 (0.8)
Torque Speed, rpm ................. 6500
Compression Ratio ................. 8.0:1
Lubrication System ................. Pumping spray
Cooling System ................. Forced air
Ignition System ................. Transistorized magneto
Starting System ................. Recoil starter
Electrical System Rating, Volts .................. 12

Fuel System

Fuel System Type ................. Carburetor
Carburetor Type ................. Diaphragm
Fuel Consumption, g/HPh ................. 340
Fuel Type ................. Gasoline (86 or higher)
Fuel Tank Capacity, qts (L) ................. 0.47 (0.45)

Dimensions and Weight

Overall Length, in (mm) ................. 8.3 (210)
Overall Width, in (mm) ................. 9.9 (250)
Overall Height, in (mm) ................. 9.9 (250)
Net Weight, lbs (kg) ................. 7.3 (3.3)

Maintenance Data

Engine Oil

Engine Oil Type (Summer) ................. SAE 10W-30
Engine Oil Type (Winter) ................. SAE 10W
API Service Classifications ................. SG or SF
Oil Capacity, qts (L) ................. 0.11 (0.10)

Ignition System

Spark Plug Type ................. NGK C5HSB, CR5HSB, Denso U16FS-UB, U16FSR-UB
Spark Plug Gap, in (mm) ................. 0.0236-0.0276 (0.60-0.70)
Ignition Coil Air Gap, in (mm) ................. 0.014-0.020 (0.35-0.50)
Ignition Timing, deg ................. 27 BTDC

Service Specifications

Cylinder Block

Cylinder Compression, psi (kPa) ................. 41-84 (285-580)
Cylinder Bore Inside Diameter (Std), in (mm) ................. 1.30 (33.00)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) ................. 1.304 (33.05)
Piston Skirt Outside Diameter (Std), in (mm) ................. 1.299 (32.98)
Top Ring Width, in (mm) .................. 0.04 (0.98)
Middle Ring Width, in (mm) .................. 0.04 (0.98)
Top Ring End Gap, in (mm) .................. 0.004-0.01 (0.10-0.25)
Middle Ring End Gap, in (mm) .................. 0.004-0.01 (0.10-0.25)
Oil Ring End Gap, in (mm) .................. 0.006-0.002 (0.015-0.05)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness), in (mm) ................. 0.004 (0.10)
Intake Valve Clearance, in (mm) ................. 0.004-0.006 (0.10-0.14)
Exhaust Valve Clearance, in (mm) ................. 0.005-0.007 (0.13-0.17)
Intake Valve Stem Outside Diameter, in (mm) ................. 0.1569 (3.985)
Exhaust Valve Stem Outside Diameter, in (mm) ................. 0.1555 (3.950)
Intake Valve Guide Inside Diameter, in (mm) ................. 0.1575 (4.00)
Exhaust Valve Guide Inside Diameter, in (mm) ................. 0.1575 (4.00)
Camshaft Journal Outside Diameter, in (mm) ................. 0.20 (5.02)
Intake Cam Height, in (mm) ................. 0.897 (22.8)
Exhaust Cam Height, in (mm) ................. 0.897 (22.8)

Tightening Torque Specs

Cylinder Head Bolt, Nm (ft-lb) ................. 4 (2.9)
Crankcase Bolt, Nm (ft-lb) ................. 7 (5.1)
Camshaft Cover Bolt, Nm (ft-lb) ................. 3 (2.2)
Flywheel Nut, Nm (ft-lb) ................. 15 (11)
Clutch Bolt, Nm (ft-lb) ................. 10 (7)
Recoil Starter Pulley, Nm (ft-lbs) ................. 8 (5.7)

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