The Briggs and Stratton 253707 is a 399 cc (24.3 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine, manufactured by Briggs and Stratton.
The B&S 253707 engine has an L-head (side valve) design and a vertical PTO shaft. This engine is equipped with float type carburetor and an transistor module ignition system. The B&S 253707 engine used a dual element air cleaner: cartridge and pre-cleaner.
The cylinder bore is 87.30 mm (3.44 in) and the piston stroke is 66.7 mm (2.63 in). This engine produced 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm of horsepower.
The breakdown of the engine code is as follows:
- 25 – Displacement
- 3 – Basic design series
- 7 – Vertical PTO-shaft
- 0 – Plain bearing
- 7 – Electric starter
General information
Engine Specifications | |
Model | B&S 253707 |
Type | 4-stroke, L-head, single-cylinder |
Displacement | 399 cm 3 (24.3 cu-in) |
Max. horsepower | 11.2 PS (8.2 kW; 11 HP) at 3,600 rpm |
Max. torque | 22.7 N·m (2.3 kg·m, 16.7 ft·lb) at 2,800 rpm |
Fuel system | Carburetor |
Cooling system | Forced-air |
Ignition system | Transistor module |
Lubricating system | Splash type |
Starting system | Electric starter |
Fuel used | Unleaded gasoline (octane number 86 or higher) |
Fuel tank capacity | – |
Cylinder Block and Head
Cylinder block | ||
Compression ratio: | – | |
Bore x Stroke | 87.3 mm X 66.7 mm (3.44 x 2.63 in) | |
Sleeve internal diameter | 87.290-87.310 mm (3.4366-3.4374 in) | |
Number of piston rings (compression / oil): | 2 / 1 | |
Ring end gap | Compression ring | 0.89 mm (0.035 in) |
Oil ring | 1.14 mm (0.0449 in) | |
Connecting rod small end ID | 20.330-20.370 mm (0.8004-0.802 in) | |
Piston pin outer diameter | 20.290-20.310 mm (0.7988-0.7996 in) | |
Cylinder Head | ||
Valve Arrangement: | L-head (sidevalve) | |
Valves: | 2 |
Tightening torque specs
Tightening torque specs | |
Cylinder Head | 18.6 Nm; 13.8 ft·lb |
Connecting Rod | 20.9 Nm; 15.5 ft·lb |
Flywheel Nut | 87.8 Nm; 65.0 ft·lb |
Crankcase Cover | 15.8 Nm; 11.7 ft·lb |
Fuel Shut-Off Valve | 8.0 Nm; 5.9 ft·lb |
Governor Lever Nut | 7.0 Nm; 5.2 ft·lb |
Spark Plug Torque | 18.0 Nm; 13.5 ft·lb |
Oil Drain Plug | 20.0 Nm; 14.9 ft·lb |
Service Information
Engine | |
Max speed | 3,600 rpm |
Valve clearance | |
Intake valve clearance | 0.08-0.13 mm (0.003-0.005 in) |
Exhaust valve clearance | 0.13-0.15 mm (0.005-0.006 in) |
Oil system | |
Oil type | API SE, SF or SG |
Recommended oil |
Summer: SAE 30, 10W-30 Winter: SAE 5W-20, 5W-30 |
Oil capacity (with filter) | 1.4 L (1.48 US. qt, 1.23 Imp. qt.) |
Ignition system | |
Spark plug | Champion: CJ-8 or RJ19LM |
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.
Be the first to comment