Honda G200

Honda G200 engineThe Honda G200 is a 197 cc (12.0 single-cylinder air-coolled 4-stroke internal combustion small gasoline engine manufactured by Honda Motor Company since 1977. The Honda G200 engine is used in a wide range of small-engine equipment, including lawn care, construction, and agriculture devices for both the consumer and professional markets.

The Honda G200 engine has a slide valve (L-head) design and camshaft driven by a single row chain driven by the crankshaft. The engine has an electric or recoil starter, horizontal carburetor with butterfly valve and transistorized magneto or contact point breaker (CDI) ignition system.

The G200 engine a compression ratio rating is 6.5:1, cylinder bore and piston stroke are 67.0 mm (2.64 in) and 56.0 mm (2.20 in), respectively.

The Honda G200 produced 5.0 HP (3.7 kW) at 3600 rpm of maximum horsepower for CDI ignition models or 5.5 HP (4.0 kW) at 3600 rpm for models with magneto ignition.

General information

Engine Specifications
Type4-stroke, side valve type (L-head), single cylinder
Displacement197 cm 3 (12.0 cu-in)
Max. horsepower 5.0 HP (3.7 kW) at 3600 rpm (CDI)
5.5 HP (4.0 kW) at 3600 rpm (Magneto ignition)
Max. torque Crankshaft PTO type:
10.4 Nm (1.06 kg·m) at 2500 rpm (CDI)
10.8 Nm (1.10 kg·m) at 2500 rpm (Magneto ignition)
Camshaft PTO type:
20.8 Nm (2.12 kg·m) at 1250 rpm (CDI)
21.6 Nm (2.2 kg·m) at 1250 rpm (Magneto ignition)
CarburetorHorizontal, butterfly valve
Cooling systemForced-air
Ignition systemTransistorized magneto or CDI
Lubricating systemSplash system
Starting systemRecoil starter
Stoping systemGround of primary circuit
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity4.3 L (1.13 US gal, 0.94 Imp gal.)
Fuel consumption290 g/HPh
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:6.5:1
Bore x Stroke67 x 56 mm (2.64 x 2.20 in)
Sleeve internal diameter64.00 mm (2.52 in)
Piston skirt outer diameter67.00 mm (2.64 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop/second/oil0.01-0.05 mm (0.0004-0.002 in)
Ring end gapTop/second0.2-0.4 mm (0.008-0.016 in)
Oil0.2-0.4 mm (0.008-0.016 in)
Ring widthTop/second2.0 mm (0.08 in)
Oil3.0 mm (0.12 in)
Connecting rod small end ID15.0 mm (0.059 in)
Connecting rod big end ID26.0 mm (1.023 in)
Crankpin outer diameter26.0 mm (1.02 in)
Cylinder Head
Warpage (limit)0.10 mm (0.004 in)
Valve Arrangement:Side valve type (L-head)
Stem outer diameter (standard):INTAKE7.0 mm (0.28 in)
EXHAUST7.0 mm (0.28 in)
Guide internal diameterINTAKE / EXHAUST7.0 mm (0.28 in)
Spring free length36.7 mm (1.44 in)
Cam height:INTAKE33.5 mm (1.32 in)
EXHAUST33.8 mm (1.33 in)
Camshaft journal diameter:17.8 mm (0.70 in)

Maintenance data

Maximum speed3850 ± 150 rpm
Idle speed1400 ± 150 rpm
Cylinder compression6.0 kg/cm2 (85 psi)
Adjust timing ignition
Ignition timing 24° B.T.D.C. – for magneto ignition
20° B.T.D.C. (Fixed) – Contact breaker point
The CDI type does not require adjustment.
Adjust valve clearance
Intake valve0.08-0.16 mm (0.0031-0.0063 in)
Exhaust valve0.16-0.24 mm (0.0063-0.0094 in)
Oil system
Oil typeHonda 4-stroke “SE”
Recommended oil10W-40
Oil capacity0.7 L (1.5 US pt. 1.2 Imp. pt.)
Main jet#75
Float height8.2 mm (0.32 in)
Pilot screw opening2 turns out
Ignition system
Spark plug NGK: B4H, BR4HS
Spark plug gap0.6-0.7 mm (0.024-0.028 in)
Spark plug cap resistance10 kΩ
Ignition coil (Contact breaker piont type)
Resistance in secondary coil6.6 kΩ
Ignition coil (transistorized magneto type)
Primary ignition coil resistance0.9 kΩ
Secondary ignition coil resistance6.5 kΩ
Ignition coil air gap0.3 ± 0.1 (0.012 ± 0.004)

Tightening torque specs

Tightening torque specs
Air cleaner case nut (M6x10)10 Nm; 1.0 kg·m; 7 ft·lb
Air cleaner case bolt (M6x70)2.5 Nm; 0.25 kg·m; 1.8 ft·lb
Connecting rod bolt (M7x35)12 Nm; 1.2 kg·m; 8.6 ft·lb
Cylinder head bolt (M8x45)25 Nm; 2.5 kg·m; 18 ft·lb
Cylinder barrel stud (M8)4 Nm; 0.4 kg·m; 2.9 ft·lb
Crankcase cover bolt (M6x32)10 Nm; 1.0 kg·m; 7 ft·lb
Control lever bolt (M6x12)10 Nm; 1.0 kg·m; 7 ft·lb
Fan cover (M6x12)10 Nm; 1.0 kg·m; 7 ft·lb
Flywheel nut (M14x1.5)75 Nm; 7.5 kg·m; 54 ft·lb
Fuel cock bolt (M6x12)10 Nm; 1.0 kg·m; 7 ft·lb
Fuel tank bolt, nut (M6x10)10 Nm; 1.0 kg·m; 7 ft·lb
Ignition coil bolt (M6x32)10 Nm; 1.0 kg·m; 7 ft·lb
Muffler mounting nut (M8x12.5)12 Nm; 1.2 kg·m; 8.6 ft·lb
Muffler protector mounting nut (M6x8)5 Nm; 0.5 kg·m; 3.6 ft·lb
Oil drain bolt (M12)20 Nm; 2.0 kg·m; 14.5 ft·lb
Side plate (M6x12)10 Nm; 1.0 kg·m; 7 ft·lb
Shroud (M6x12)10 Nm; 1.0 kg·m; 7 ft·lb
Tappet room cover bolt (M6x12)14 Nm; 1.4 kg·m; 10 ft·lb
5 mm bolts, nuts5.5 Nm; 0.55 kg·m; 4.0 ft·lb
6 mm bolts, nuts10 Nm; 1.0 kg·m; 7 ft·lb
8 mm bolts, nuts24 Nm; 2.4 kg·m; 17 ft·lb
10 mm bolts, nuts37 Nm; 3.7 kg·m; 27 ft·lb
12 mm bolts, nuts55 Nm; 5.5 kg·m; 39.5 ft·lb
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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