Honda G150 K1

Honda G150 K1 engineThe Honda G150 K1 is a 0.1 L (144 cc, 8.79 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Honda Motor Company since 1977 for general-purpose applications.

The Honda G150 K1 engine has a single cylinder, side-valve (L-head) design with two valves, camshaft driven by single row chain, and heavy-duty recoil starter. This engine used horizontally type carburetor with butterfly valve, contact breaker point or transistorized magneto ignition, splash type lubricating system and forced-air cooling system. The engine could be fitted with dual element type, semi-dry type or oil-bath type air cleaners. The G150 K1 is equipped with 2.5 L (0.66 US. gal. 0.55 Imp. gal.) fuel tank.

The G150 K1 engine produced 3.5 PS (2.6 kW; 3.5 HP) at 3,600 rpm of maximum horsepower and 7.1 N·m (0.7 kg·m, 5.2 ft·lb) at 3,000 rpm of maximum torque for models with contact breaker point ignition system or 3.8 PS (2.8 kW; 3.8 HP) at 3,600 rpm of peak power and 7.4 N·m (0.8 kg·m, 5.5 ft·lb) at 3,000 rpm of maximum torque for models with transistorized magneto ignition system.

General information

Engine Specifications
Engine model G150 K1
Engine type 4-stroke, L-head, single-cylinder
Displacement 144 cm3, (8.79 cu·in)
Max. horsepower 3.5 PS (2.6 kW; 3.5 HP) at 3,600 rpm (Contact breaker point)
3.8 PS (2.8 kW; 3.8 HP) at 3,600 rpm (Transistorized magneto)
Max. torque Crankshaft PTO:
7.1 N·m (0.7 kg·m, 5.2 ft·lb) at 3,000 rpm (Contact breaker point)
7.4 N·m (0.8 kg·m, 5.5 ft·lb) at 3,000 rpm (Transistorized magneto)

Camshaft PTO:
14.2 N·m (1.44 kg·m, 10.4 ft·lb) at 1,500 rpm (Contact breaker point)
14.8 N·m (1.52 kg·m, 11.0 ft·lb) at 1,500 rpm (Transistorized magneto)

Cooling system Forced-air
Air cleaner Dual element type, semi-dry type, oil-bath type
Lubricating system Splash type
Ignition system Contact breaker point or transistorized magneto ignition
Fuel system Horizontal type carburetor with butterfly valve
Fuel consumption 421 g/kWH
Fuel tank capacity 2.5 L (0.66 US. gal. 0.55 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal govervor
PTO shaft rotation Counterclockwise (from PTO shaft side)

Cylinder Block and Head

The cylinder bore is 64.0 mm (2.52 in) and the piston stroke is 45.0 mm (1.77 in). Compression ratio rating is 6.5:1. The crankshaft is mounted on two ball bearings for reduced friction. The piston is fitted with two compression rings and a single oil ring.

Cylinder block
Compression ratio: 6.5:1
Cylinder bore: 64.0 mm (2.52 in)
Piston stroke: 45.0 mm (1.77 in)
Cylinder internal diameter (standard): 64.000 mm (2.5197 in)
Piston skirt outer diameter (standard): 64.000 mm (2.5197 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 26.000 mm (1.0236 in)
Connecting rod small end diameter (standard): 15.000 mm (0.5906 in)
Piston pin diameter: 15.000 mm (0.5906 in)
Side clearance (Top): 0.01-0.05 mm (0.0004-0.002 in)
Side clearance (Second): 0.01-0.05 mm (0.0004-0.002 in)
Side clearance (Oil): 0.01-0.05 mm (0.0004-0.002 in)
Ring end gap (Top): 0.20-0.40 mm (0.0079-0.0157 in)
Ring end gap (Second): 0.20-0.40 mm (0.0079-0.0157 in)
Ring end gap (Oil): 0.20-0.40 mm (0.0079-0.0157 in)
Ring width (Top): 2.0 mm (0.0787 in)
Ring width (Second): 2.0 mm (0.0787 in)
Ring width (Oil): 3.0 mm (0.1181 in)
Crankpin journal diameter: 26.000 mm (1.0236 in)
Crankshaft center distance: 22.5 mm (0.885 in)
Cylinder head
Valve arrangement: L-head, chain driven
Valves:: 2
Valve steam diameter (INTAKE): 7.0 mm (0.2756 in)
Valve steam diameter (EXHAUST): 7.0 mm (0.2756 in)
Valve spring free length (INTAKE): 36.7 mm (1.4449 in)
Valve spring free length (EXHAUST): 36.7 mm (1.4449 in)
Camshaft lobe height (INTAKE): 33.5 mm (1.3189 in)
Camshaft lobe height (EXHAUST): 33.8 mm (1.3307 in)
Camshaft journal diameter : 17.8 mm (0.7008 in)

Service Data

The Honda 4-stroke or an equivalent (SE or SF) engine oil with a viscosity of SAE 10W-30 or 10W-40 is recommended for the G150 K1, refilling oil capacity is 0.7 L (0.74 US. qt, 0.62 Imp. qt.). Recommended spark plug is NGK: B-4H, BR-4HS with 0.6-0.7 mm (0.0236-0.0276 in) spark plug gap.

The valve clearance is 0.08-0.16 mm (0.0031-0.0063 in) for intake valves and 0.16-0.24 mm (0.0063-0.0094 in) for exhaust valves. Standard cylinder compression is 6.0 kg/cm2 (85 psi) at 600 rpm.

Engine
Maximum speed: 3,850±150 rpm
Idle speed: 1,400±150 rpm
Cylinder compression: 6.0 kg/cm2 (85 psi) at 600 rpm
Valve clearance
Intake valve clearance: 0.08-0.16 mm (0.0031-0.0063 in)
Exhaust valve clearance: 0.16-0.24 mm (0.0063-0.0094 in)
Oil system
Lubrication system: Splash type
Oil type: SAE 10W-30 or 10W-40
Recommended oil: Honda 4-stroke or an equivalent (SE or SF)
Oil capacity: 0.7 L (0.74 US. qt, 0.62 Imp. qt.)
Fuel system
Type: Horizontal type carburetor with butterfly valve
Main jet: #70
Float height: 8.2 mm (0.3228 in)
Pilot screw opening: 1-5/8 turns out
Ignition system
Type: Contact breaker point or transistorized magneto ignition
Ignition timing: B.T.D.C. 20° (Fixed) (Contact breaker point ign.)
B.T.D.C. 24° (Transistorized magneto ign.)
Spark plug: NGK: B-4H, BR-4HS
Spark plug gap: 0.6-0.7 mm (0.0236-0.0276 in)
Ignition coil air gap 0.2-0.4 mm (0.0079-0.0157 in)

Tightening torque

Tightening torque settings
Connecting rod bolt 12 Nm; 1.2 kg·m; 8.6 ft·lb
Cylinder head bolt 25 Nm; 2.5 kg·m; 18 ft·l
Flywheel nut 75 Nm; 7.5 kg·m; 54 ft·lb
Oil drain bolt 20 Nm; 2.0 kg·m; 14.5 ft·lb

Applications

Manufacturer or Brand Models
Tillers
Honda F300

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