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Honda GS160 Engine

The Honda GS160 is a 4-stroke OHС single cylinder horizontal shaft air-cooled gasoline engine from GS-series. A 9.8 cu. in (160 cc) engine has a cylinder bore of 2.68" (68 mm), piston stroke of 1.97" (50 mm), and rated power of 5 Hp (3.7 kW) at 3600 rpm. The compression ratio rating is 8.5:1. The Honda GS160 engine is equipped with a splash type lubrication, horizontal carburetor with butterfly valve, forced-air cooling system, and transistorized magneto ignition system. The operating weight is 30 lbs (13.5 kg).

General Technical Data

Engine Specifications

Engine Model ................. Honda GS160
Engine Type ................. 4-cycle 1-cylinder OHС air-cooled small gasoline
Number of Cylinders ................. Single
Displacement, cu.in (cc) ................. 9.8 (160)
Cylinder Bore, in (mm) ................. 2.68 (68.0)
Piston Stroke, in (mm) ................. 1.97 (50.0)
Rated Engine Power, hp (kW) ................. 5.0 (3.7)
Rated Engine Speed, rpm ................. 3600
Maximum Torque, Nm (ft-lbs) ................. 10.3 (7.6)
Torque Speed, rpm ................. 2500
Compression Ratio ................. 8.5:1
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 ................. 230
Fuel Type ................. Gasoline (86 or higher)
Fuel Tank Capacity, qts (L) ................. 2.1 (2.0)

Dimensions and Weight

Overall Length, in (mm) ................. 13.2 (335)
Overall Width, in (mm) ................. 14.5 (370)
Overall Height, in (mm) ................. 13.6 (345)
Net Weight, lbs (kg) ................. 30.0 (13.5)

Maintenance Data

Engine Oil

Engine Oil Type (Summer) ................. SAE 10W-30
Engine Oil Type (Winter) ................. SAE 10W
API Service Classifications ................. SE or SF
Oil Capacity, qts (L) ................. 0.65 (0.60)

Ignition System

Spark Plug Type ................. NGK BPR6ES
Spark Plug Gap, in (mm) ................. 0.028-0.031 (0.70-0.80)
Ignition Timing, deg ................. 20 BTDC
Spark Plug Torque, Nm (ft-lbs) ................. 20 (14.5)

Service Specifications

Cylinder Block

Cylinder Compression, psi (kPa) ................. 71 (490)
Cylinder Bore Inside Diameter (Std), in (mm) ................. 2.52 (64.00)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) ................. 2.526 (64.165)
Connecting Rod Small End I.D, in (mm) .................. 0.512 (13.005)
Connecting Rod Big End I.D, in (mm) .................. 1.024 (26.02)
Crankpin Outside Diameter (Std), in (mm) .................. 1.023 (25.98)
Crankpin Outside Diameter (Wear Limit), in (mm) .................. 1.020 (25.971)
Main Journal Outside Diameter (PTO), in (mm) .............. 1.1021 (27.993)
Main Journal Outside Diameter (Flywheel), in (mm) .......... 0.9997 (25.393)
Piston Skirt Outside Diameter (Std), in (mm) ................. 2.5185 (63.969)
Piston Skirt Outside Diameter (Wear Limit), in (mm) ................. 2.515 (63.88)
Top Ring Width, in (mm) .................. 0.06 (1.50)
Middle Ring Width, in (mm) .................. 0.06 (1.50)
Oil Ring Width, in (mm) .................. 0.10 (2.50)
Top Ring Side Clearance, in (mm) .................. 0.0006-0.0018 (0.015-0.045)
Middle Ring Side Clearance, in (mm) .................. 0.0006-0.0018 (0.015-0.045)
Oil Ring Side Clearance, in (mm) .................. 0.0006-0.0018 (0.015-0.045)
Top Ring End Gap, in (mm) .................. 0.008-0.014 (0.20-0.35)
Middle Ring End Gap, in (mm) .................. 0.012-0.018 (0.30-0.45)
Oil Ring End Gap, in (mm) .................. 0.006-0.014 (0.15-0.35)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness), in (mm) ................. 0.004 (0.10)
Intake Valve Clearance, in (mm) ................. 0.004-0.008 (0.11-0.19)
Exhaust Valve Clearance, in (mm) ................. 0.006-0.010 (0.16-0.24)
Intake Valve Stem Outside Diameter (Std), in (mm) ................. 0.216 (5.480)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) ................. 0.215 (5.468)
Exhaust Valve Stem Outside Diameter (Std), in (mm) ................. 0.214 (5.440)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) ................. 0.213 (5.425)
Intake Valve Guide Inside Diameter, in (mm) ................. 0.2165-0.2170 (5.500-5.512)
Exhaust Valve Guide Inside Diameter, in (mm) ................. 0.2165-0.2170 (5.500-5.512)
Intake Valve Spring Free Length, in (mm) ................. 1.34 (34.00)
Exhaust Valve Spring Free Length, in (mm) ................. 1.34 (34.00)

Tightening Torque Specs

Cylinder Head Bolt, Nm (ft-lb) ................. 12 (8.6)
Valve Adjusting Lock Nut, Nm (ft-lb) ................. 8 (5.8)
Crankcase Cover Bolt, Nm (ft-lb) ................. 12 (8.6)
Oil Drain Plug Bolt, Nm (ft-lb) ................. 24 (18)
Connecting Rod Bolt, Nm (ft-lb) ................. 12 (8.6)
Flywheel Nut, Nm (ft-lb) ................. 75 (54)
Muffler Mounting Nut, Nm (ft-lb) ................. 12 (8.6)
Governor Arm Nut, Nm (ft-lb) ................. 10 (7)
Fan Cover Stud Bolt, Nm (ft-lb) ................. 12 (8.6)
Recoil Starter Screw, Nm (ft-lb) ................. 8.5 (6.1)
Spark Plug, Nm (ft-lb) ................. 20 (14.5)

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