The Briggs and Stratton 40G777 Professional Series is a 656 cc, (40.0 cu·in) natural aspirated two-cylinders four-stroke air-cooled internal combustion gasoline engine with a vertical shaft, for general-purpose applications.
Cylinder bore and piston stroke are 75.44 mm (2.97 in) and 73.40 mm (2.89 in), respectively. This engine produced 20.1 PS (14.8 KW; 20.0 HP) at 3,600 rpm of horsepower.
The B&S 40G777 features:
- OHV design
- Electronic ignition system
- Float type carburetor
- Centrifugal governor
- Full pressure lubrication system with spin-on oil filter
- Forced air cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | B&S 40G777 Professional Series |
| Engine type | 4-stroke, OHV, V-twin |
| Displacement | 656 cm3, (40.0 cu·in) |
| Max. horsepower | 20.1 PS (14.8 KW; 20.0 HP) at 3,600 rpm |
| Max. torque | – |
| Cooling system | Forced air |
| Air cleaner | Dual-Clean (paper cartridge with a foam pre-cleaner) |
| Lubricating system | Full pressure lubrication with spin-on oil filter |
| Ignition system | Electronic |
| Fuel system | Float type carburetor |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Starting system | Electric starter |
| Governor | Centrifugal governor |
| Charging system | Alternator 12V |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | – |
| Cylinder bore: | 75.44 mm (2.97 in) |
| Piston stroke: | 73.40 mm (2.89 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Cylinder head | |
| Valve arrangement: | OHV |
| Valves: | 2 (4 valves in total) |
Service Data
| Valve clearance | |
| Intake valve clearance: | 0.10-0.15 mm (0.004-0.006 in) |
| Exhaust valve clearance: | 0.10-0.15 mm (0.004-0.006 in) |
| Oil system | |
| Lubrication system: | Full pressure lubrication system with spin-on oil filter |
| Oil type: | API SF, SG, SH, SJ or higher |
| Recommended oil: | SAE 5W-30, 10W-30 |
| Oil capacity: | W/o oil filter: 1.8 liters (1.9 US.qts, 1.58 Imp. qts) With oil filter: 1.9 liters (2.01 US.qts, 1.67 Imp. qts) |
| Fuel system | |
| Type: | Float type carburetor |
| Ignition system | |
| Type: | Electronic |
| Spark plug: | Resistor spark plug: Briggs and Stratton 491055 Champion RC12YC Long life platinum spark plug: Briggs and Stratton 5066 |
| Spark plug gap: | 0.7-0.8 mm (0.0276-0.0315 in) |
| Spark plug torque: | 20.0 Nm (2.04 kg·m; 14.76 ft·lb) |
| Armature air gap | 0.20-0.30 mm (0.008-0.012 in) |
Applications
| Manufacturer or Brand | Models |
| Lawn tractors | |
| Craftsman | 107.25004 |
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