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Honda GP200 Engine

The Honda GP200 is a four-cycle overhead valve single cylinder horizontal shaft air-cooled small gasoline engine from GP-series. A 12.1 cubic inches (0.2 L) engine has a cylinder bore of 2.68" (68 mm), piston stroke of 2.13" (54 mm), and rated power of 5.5 Hp (4.1 kW) at 3600 rpm. The compression ratio rating is 8.5:1. The Honda GP200 engine is equipped with a horizontal carburetor, splash lubrication system, transistorized magneto ignition, and starting system with recoil starter. The operating weight is 43 lbs (19.5 kg).

General Technical Data

Engine Specifications

Engine Model ................. Honda GP200H
Engine Type ................. 4-cycle 1-cylinder OHV air-cooled small gasoline
Number of Cylinders ................. Single
Displacement, cu.in (cc) ................. 12.1 (196)
Cylinder Bore, in (mm) ................. 2.68 (68.0)
Piston Stroke, in (mm) ................. 2.13 (54.0)
Rated Engine Power, hp (kW) ................. 5.5 (4.1)
Rated Engine Speed, rpm ................. 3600
Maximum Torque, Nm (ft-lbs) ................. 12.4 (9.1)
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 ................. 300
Fuel Type ................. Gasoline (86 or higher)
Fuel Tank Capacity, qts (L) ................. 3.3 (3.1)

Dimensions and Weight

Overall Length, in (mm) ................. 12.7 (325)
Overall Width, in (mm) ................. 14.9 (380)
Overall Height, in (mm) ................. 13.2 (335)
Net Weight, lbs (kg) ................. 43.1 (19.5)

Maintenance Data

Engine Oil

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

Carburetor Adjustment

Carb Main Jet ................. #78
Float Height, in (mm) ................. 0.54 (13.7)
Pilot Screw Opening ................. 2-1/2 turns out
Low Idle Speed, rpm ................. 1400±150
High Idle Speed, rpm ................. 3850±150

Ignition System

Spark Plug Type ................. NGK BPR6ES, Denso W20EPR-U
Spark Plug Gap, in (mm) ................. 0.028-0.031 (0.70-0.80)
Ignition Coil Air Gap, in (mm) ................. 0.01-0.02 (0.20-0.60)
Ignition Timing, deg ................. 20 BTDC
Spark Plug Torque, Nm (ft-lbs) ................. 18 (13.2)

Service Specifications

Cylinder Block

Cylinder Compression, psi (kPa) ................. 51 (350)
Cylinder Bore Inside Diameter (Std), in (mm) ................. 2.6772 (68.000)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) ................. 2.6779 (68.020)
Piston Skirt Outside Diameter (Std), in (mm) ................. 2.6758 (67.965)
Piston Skirt Outside Diameter (Wear Limit), in (mm) ................. 2.6766 (67.985)
Connecting Rod Small End I.D, in (mm) .................. 0.7089-0.7093 (18.006-18.017)
Connecting Rod Big End I.D, in (mm) .................. 1.1817-1.1821 (30.015-30.025)
Crankpin Outside Diameter (Std), in (mm) .................. 1.1803 (29.980)
Crankpin Outside Diameter (Wear Limit), in (mm) .................. 1.1799 (29.970)
Top Ring Width, in (mm) .................. 0.0374-0.0382 (0.950-0.970)
Middle Ring Width, in (mm) .................. 0.0370-0.0378 (0.940-0.960)
Top Ring Side Clearance, in (mm) .................. 0.0014-0.0028 (0.035-0.070)
Middle Ring Side Clearance, in (mm) .................. 0.0018-0.0032 (0.045-0.080)
Top Ring End Gap, in (mm) .................. 0.008-0.014 (0.20-0.35)
Middle Ring End Gap, in (mm) .................. 0.014-0.020 (0.35-0.50)
Oil Ring End Gap, in (mm) .................. 0.008-0.028 (0.20-0.70)

Cylinder Head and Valves

Cylinder Head (Max Out of Flatness), in (mm) ................. 0.004 (0.10)
Intake Valve Clearance, in (mm) ................. 0.005-0.007 (0.13-0.17)
Exhaust Valve Clearance, in (mm) ................. 0.007-0.009 (0.18-0.22)
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)
Camshaft Journal Outside Diameter (Std), in (mm) ................. 0.5506 (13.984)
Camshaft Journal Outside Diameter (Wear Limit), in (mm) ................. 0.5498 (13.966)
Intake Cam Height, in (mm) ................. 1.0827-1.0984 (27.50-27.90)
Exhaust Cam Height, in (mm) ................. 1.0845-1.1003 (27.55-27.95)

Tightening Torque Specs

Cylinder Head Bolt, Nm (ft-lb) ................. 24 (18)
Air Cleaner Mounting Nut, Nm (ft-lb) ................. 9 (6.6)
Crankcase Cover Bolt, Nm (ft-lb) ................. 24 (18)
Oil Drain Plug Bolt, Nm (ft-lb) ................. 18 (13.2)
Connecting Rod Bolt, Nm (ft-lb) ................. 12 (8.6)
Flywheel Nut, Nm (ft-lb) ................. 75 (54)
Fuel Tank Bolt, Nm (ft-lb) ................. 10 (7)
Muffler Mounting Nut, Nm (ft-lb) ................. 24 (18)
Rocker Arm Pivot Bolt, Nm (ft-lb) ................. 24 (18)
Oil Level Switch Joint Nut, Nm (ft-lb) ................. 10 (7)
Recoil Starter Screw, Nm (ft-lb) ................. 10 (7)
Spark Plug, Nm (ft-lb) ................. 18 (13.2)

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