Honda G42 Specifications
| Engine Model: Honda G42 |
| Engine Type: 4-cycle single-cylinder L-head air-cooled gasoline |
| Total Displacement: 10.4 cu.in (171 cc) |
| Rated Engine Power: 4.4 Hp (3.3 kW) at 4000 rpm |
| Carburetor Type: Horizontal with butterfly valve |
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Engine Model ................. Honda G42
Engine Type ................. 4-cycle L-head 1-cylinder air-cooled small gasoline
Number of Cylinders ................. Single
Displacement, cu.in (cc) ................. 10.4 (171)
Cylinder Bore, in (mm) ................. 2.59 (66.0)
Piston Stroke, in (mm) ................. 1.97 (50.0)
Rated Engine Power, hp (kW) ................. 4.4 (3.3)
Rated Engine Speed, rpm ................. 4000
Maximum Torque, Nm (ft-lbs) ................. 8.3 (6.1)
Torque Speed, rpm ................. 3600
Compression Ratio ................. 6.4:1
Lubrication System ................. Splash type
Cooling System ................. Forced air
Air Cleaner Type ................. Semi-dry
Ignition System ................. High voltage ignition
Starting System ................. Recoil starter
Electrical System Rating, Volts .................. 12
Fuel System Type ................. Carburetor
Carburetor Type ................. Horizontal with butterfly valve
Governor Type ................. Centrifugal
Fuel Consumption, g/HPh ................. 300
Fuel Type ................. Gasoline (86 or higher)
Fuel Tank Capacity, qts (L) ................. 3.6 (3.4)
Overall Length, in (mm) ................. 16.7 (425)
Overall Width, in (mm) ................. 12.8 (325)
Overall Height, in (mm) ................. 16.9 (430)
Net Weight, lbs (kg) ................. 41.9 (19.0)
Cylinder Compression, psi (kPa) ................. 85 (585)
Cylinder Bore Inside Diameter (Std), in (mm) ................. 2.59 (66.00)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) ................. 2.593 (66.10)
Connecting Rod Small End I.D, in (mm) .................. 0.708-0.711 (18.01-18.03)
Piston Skirt Outside Diameter, in (mm) ................. 2.59-2.60 (65.97-65.99)
Top Ring Side Clearance, in (mm) .................. 0.001-0.003 (0.030-0.070)
Middle Ring Side Clearance, in (mm) .................. 0.001-0.003 (0.030-0.070)
Oil Ring Side Clearance, in (mm) .................. 0.001-0.003 (0.030-0.070)
Top Ring End Gap, in (mm) .................. 0.008-0.016 (0.20-0.40)
Middle Ring End Gap, in (mm) .................. 0.008-0.016 (0.20-0.40)
Oil Ring End Gap, in (mm) .................. 0.008-0.016 (0.20-0.40)
Cylinder Head (Max Out of Flatness), in (mm) ................. 0.004 (0.10)
Intake Valve Clearance, in (mm) ................. 0.003-0.006 (0.076-0.152)
Exhaust Valve Clearance, in (mm) ................. 0.003-0.006 (0.076-0.152)
Intake Valve Stem Outside Diameter (Std), in (mm) ................. 0.274 (6.97)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) ................. 0.272 (6.91)
Exhaust Valve Stem Outside Diameter (Std), in (mm) ................. 0.273 (6.925)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) ................. 0.271 (6.89)
Intake Valve Guide Inside Diameter, in (mm) ................. 0.276 (7.00)
Exhaust Valve Guide Inside Diameter, in (mm) ................. 0.276 (7.00)
Intake Valve Stem to Valve Guide Clearance, in (mm) .................. 0.0012-0.0023 (0.030-0.060)
Exhaust Valve Stem to Valve Guide Clearance, in (mm) .................. 0.0030-0.0041 (0.075-0.105)
Intake Valve Spring Free Length, in (mm) ................. 1.098 (27.9)
Exhaust Valve Spring Free Length, in (mm) ................. 1.098 (27.9)
Intake Valve Seat Width, in (mm) ................. 0.028 (0.70)
Exhaust Valve Seat Width, in (mm) ................. 0.028 (0.70)
Camshaft Journal Outside Diameter, in (mm) ................. 0.470-0.471 (11.953-11.968)
Engine Oil Type (Summer) ................. SAE 10W-40
Engine Oil Type (Winter) ................. SAE 10W
API Service Classifications ................. SE or higher
Oil Capacity, qts (L) ................. 0.65 (0.60)
Spark Plug Type ................. NGK BR6HS, B6HS
Spark Plug Gap, in (mm) ................. 0.0236-0.0276 (0.60-0.70)
Ignition Timing, deg ................. 20 BTDC
Connecting Rod Bolt, Nm (ft-lb) ................. 9-11 (6.5-8.0)
Cylinder Head Bolt, Nm (ft-lb) ................. 20-24 (14.5-17.4)
Flywheel Nut, Nm (ft-lb) ................. 80-90 (57.9-65.1)
Carburetor Mounting Bolt, Nm (ft-lb) ................. 10-12 (7.2-8.7)
Starter Pulley, Nm (ft-lb) ................. 8-12 (5.8-8.7)
Fuel Cock Bolt, Nm (ft-lb) ................. 10-12 (7.2-8.7)
Muffler Mounting Nut, Nm (ft-lb) ................. 8-12 (5.8-8.7)
Fuel Tank Bolt, Nm (ft-lb) ................. 10-12 (7.2-8.7)
Spark Plug, Nm (ft-lbs) ................. 20 (14.7)
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