Briggs and Stratton 253707 (11.0 HP, 399 cc) engine: review and specs

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)

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

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.