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Honda GX80 Engine

The Honda GX80 is a four-cycle OHV single cylinder horizontal shaft air-cooled small gasoline engine from GX-series. A 4.9 cubic inches (80 cc) engine has a cylinder bore of 1.81" (46 mm), piston stroke of 1.89" (48 mm), and rated power of 4.5 Hp (3.4 kW) at 3600 rpm. The compression ratio rating is 9.0:1. The Honda GX80 engine is equipped with a horizontal carburetor, splash lubrication system, transistorized magneto ignition system, and starting system with recoil starter. The operating weight is 24.7 lbs (11.2 kg).

General Technical Data

Engine Specifications

Engine Model ................. Honda GX80
Engine Type ................. 4-cycle 1-cylinder OHV air-cooled gasoline
Number of Cylinders ................. Single
Displacement, cu.in (cc) ................. 4.9 (79.7)
Cylinder Bore, in (mm) ................. 1.81 (46.0)
Piston Stroke, in (mm) ................. 1.89 (48.0)
Rated Engine Power, hp (kW) ................. 2.0 (1.5)
Rated Engine Speed, rpm ................. 3600
Idle Speed, rpm ................. 3600±100
Maximum Torque, Nm (ft-lbs) ................. 4.5 (3.4)
Torque Speed, rpm ................. 2500
Compression Ratio ................. 9.0:1
Lubrication System ................. Splash type
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 ................. Horizontal with butterfly valve
Fuel Consumption, g/HPh ................. 370
Fuel Type ................. Gasoline (86 or higher)
Fuel Tank Capacity, qts (L) ................. 1.6 (1.5)

Dimensions and Weight

Overall Length, in (mm) ................. 10.8 (275)
Overall Width, in (mm) ................. 13.4 (340)
Overall Height, in (mm) ................. 12.8 (325)
Net Weight, lbs (kg) ................. 24.7 (11.2)

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) ................. 0.38 (0.36)

Ignition System

Spark Plug Type ................. NGK C4HSB
Spark Plug Gap, in (mm) ................. 0.028-0.031 (0.70-0.80)
Ignition Timing, deg ................. 23 BTDC

Valve clearance

Intake Valve Clearance, in (mm) ................. 0.003-0.005 (0.08-0.12)
Exhaust Valve Clearance, in (mm) ................. 0.005-0.007 (0.13-0.17)

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