Briggs and Stratton 253707

Briggs and Stratton 253707The 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

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)
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