The Briggs and Stratton 400707 is a 655 cc (40.0 cu·in) two-cylinder air-cooled four-stroke internal combustion gasoline engine, manufactured by Briggs and Stratton.
The B&S 400707 engine has an L-head (sidevalve) design and a vertical PTO shaft. This engine is equipped with float type carburetor and a flywheel magneto ignition system. The B&S 400707 engine used a full pressure lubrication system.
A 87.3 mm (3.44 in) cylinder bore and 55.0 mm (2.16 in) piston stroke give the B&S 400707 engine a total of 655 cc of displacement.
This engine produced 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm of horsepower and 34.8 N·m (3.5 kg·m, 25.6 ft·lb) at 2,700 rpm of torque.
The breakdown of the engine code is as follows:
- 40 – Displacement
- 0 – Basic design series
- 7 – Vertical PTO-shaft
- 0 – Ball bearing, Flange mounting, Pressure lubrication
- 7 – Electric starter
General information
Engine Specifications | |
Model | B&S 400707 |
Type | 4-stroke, L-head, opposed two-cylinder |
Displacement | 655 cm 3 (40.0 cu-in) |
Max. horsepower | 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm |
Max. torque | 34.8 N·m (3.5 kg·m, 25.6 ft·lb) at 2,700 rpm |
Fuel system | Float type carburetor |
Cooling system | Forced-air |
Ignition system | Flywheel magneto |
Lubricating system | Full pressure lubrication |
Starting system | Electric starter |
Fuel used | Gasoline |
Fuel tank capacity | – |
Cylinder Block and Head
Cylinder block | ||
Bore x Stroke | 87.3 mm X 55.0 mm (3.44 x 2.16 in) | |
Sleeve internal diameter | 87.280-87.310 mm (3.4362-3.4374 in) | |
Number of piston rings (compression / oil): | 2 / 1 | |
Side clearance | Top | 0.090-0.150 mm (0.0035-0.0059 in) |
Second | 0.090-0.150 mm (0.0035-0.0059 in) | |
Oil | 0.090-0.150 mm (0.0035-0.0059 in) | |
Ring end gap | Top | 0.180-0.430 mm (0.0071-0.0169 in) |
Second | 0.180-0.430 mm (0.0071-0.0169 in) | |
Oil | 0.180-0.430 mm (0.0071-0.0169 in) | |
Connecting rod small end ID | 20.340-20.350 mm (0.8008-0.8012 in) | |
Piston pin outer diameter | 20.320-20.330 mm (0.8-0.8004 in) | |
Cylinder Head | ||
Valve Arrangement: | L-head | |
Valves: | 4 (2 per cylinder) | |
Valve steam diameter | INTAKE | 7.820-7.870 mm (0.3079-0.3098 in) |
EXHAUST | 7.820-7.870 mm (0.3079-0.3098 in) |
Tightening torque
Tightening torque specs | |
Alternator (to cylinder) | 2.0 Nm; 1.5 ft·lb |
Air cleaner base (to carburetor) | 3.0 Nm; 2.2 ft·lb |
Armature | 3.0 Nm; 2.2 ft·lb |
Blower housings | 10.0 Nm; 7.4 ft·lb |
Breather | 3.0 Nm; 2.2 ft·lb |
Carburetor to intake manifold | 11.0 Nm; 8.1 ft·lb |
Connecting rod | 22.0 Nm; 16.3 ft·lb |
Crankcase sump/cover | 25.0 Nm; 18.5 ft·lb |
Cylinder head | 18.0 Nm; 13.3 ft·lb |
Carburetor to solenoid | 11.0 Nm; 8.1 ft·lb |
Fan Retainer | 17.0 Nm; 12.6 ft·lb |
Flywheel nut | 203.0 Nm; 150.0 ft·lb |
Governor lever nut | 11.0 Nm; 8.1 ft·lb |
Intake manifold to cylinder head | 10.0 Nm; 7.4 ft·lb |
Starter motor | 18.0 Nm; 13.3 ft·lb |
Service Information
Engine | |
Max speed | 3,600 rpm |
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) | 1.70 L (1.8 US. qt, 1.5 Imp. qt.) |
Ignition system | |
Spark plug | Champion RJ-12, AC R-46, Autolite 308 |
Spark plug gap | 0.7-0.8 mm (0.0276-0.0315 in) |
We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.
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