The Briggs and Stratton 40G777 Professional Series is a 656 cc (40.0 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine, manufactured by Briggs and Stratton.
The B&S 40G777 engine has an OHV (overhead valve) design and a vertical PTO shaft. This engine is equipped with float type carburetor and an electronic ignition system. The B&S 40G777 engine used Dual-Clean air cleaner (paper element with a foam pre-cleaner).
The cylinder bore is 75.44 mm (2.97 in) and the piston stroke is 73.40 mm (2.89 in). This engine produced 20.3 PS (14.9 kW; 20 HP) at 3,600 rpm of horsepower.
The breakdown of the engine code is as follows:
- 40 – Displacement
- G – Basic design series
- 7 – Vertical PTO-shaft
- 7 – Plain bearing, Pressure lubrication
- 7 – Electric starter
General information
| Engine Specifications | |
| Model | B&S 40G777 Professional Series |
| Type | 4-stroke, OHV, V-twin |
| Displacement | 656 cm 3 (40.0 cu-in) |
| Max. horsepower | 20.3 PS (14.9 kW; 20 HP) at 3,600 rpm |
| Max. torque | – |
| Fuel system | Float typet carburetor |
| Cooling system | Forced-air |
| Ignition system | Electronic |
| Lubricating system | Full pressure lubrication system with spin-on oil filter |
| Starting system | Electric starter |
| Fuel used | Gasoline |
| Fuel tank capacity | – |
Cylinder Block and Head
| Cylinder block | ||
| Bore x Stroke | 75.44 mm X 73.40 mm (2.97 x 2.89 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Cylinder Head | ||
| Valve Arrangement: | OHV | |
| Valves: | 4 (2 per cylinder) | |
Service Information
| Engine | |
| Max speed | 3,600 rpm |
| 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 | |
| Oil type | API SF, SG, SH, SJ or higher |
| Recommended oil |
Summer: SAE 30, 10W-30 Winter: SAE 5W-30 |
| Oil capacity (with filter) | 1.9 liters (2.01 US.qts, 1.67 Imp. qts) |
| Ignition system | |
| Spark plug | Champion RC12YC |
| Spark plug gap | 0.7-0.8 mm (0.0276-0.0315 in) |
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