Briggs and Stratton 253707

Briggs and Stratton 253707The Briggs and Stratton 253707 is a 399 cc (24.35 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine, manufactured by Briggs & Stratton for general-purpose applications.

Cylinder bore is 87.3 mm (3.44 in) and 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 and 22.7 N·m (2.3 kg·m, 16.7 ft·lb) at 2,800 rpm of torque.

The Briggs and Stratton 253707 features:

  • L-head (side valve) design
  • Vertical PTO-shaft
  • Transistor module ignition system
  • Float type carburetor
  • Centrifugal governor
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine model B&S 253707
Engine type 4-stroke, L-head (side valve), single-cylinder
Displacement 399 cm3, (24.35 cu·in)
Max. horsepower 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm
Max. torque 22.7 N·m (2.3 kg·m, 16.7 ft·lb) at 2,800 rpm
Cooling system Forced air
Air cleaner Dual element (cartridge and pre-cleaner)
Ignition system Transistor module
Fuel system Float type carburetor
Fuel used Gasoline
Starting system Electric starter
Governor Centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)

Cylinder Block and Head

Cylinder block
Compression ratio:
Cylinder bore: 87.3 mm (3.44 in)
Piston stroke: 66.7 mm (2.63 in)
Cylinder internal diameter (standard): 87.290-87.310 mm (3.4366-3.4374 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 31.760-31.810 mm (1.2504-1.2524 in)
Connecting rod small end diameter (standard): 20.330-20.370 mm (0.8004-0.802 in)
Piston pin diameter: 20.290-20.310 mm (0.7988-0.7996 in)
Ring end gap (Top): 0.89 mm (0.035 in)
Ring end gap (Second): 0.89 mm (0.035 in)
Ring end gap (Oil): 1.14 mm (0.0449 in)
Crankshaft main journal diameter: 35.000 mm (1.378 in)
Crankpin journal diameter: 31.720 mm (1.2488 in)
Crankshaft center distance: 33.35 mm (1.315 in)
Cylinder head
Valve arrangement: L-head (side valve)
Valves: 2

Tightening torque

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 Data

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: SE, SF or SG
Recommended oil: Summer: SAE 30, 10W-30
Winter: SAE 5W-20, 5W-30
Oil capacity: 1.4 L (1.48 US. qt, 1.23 Imp. qt.)
Fuel system
Type: Float type carburetor
Main Adjustment Screw 1-1/2 turn out
Idle Adjustment Screw 1 turn out turns out
Ignition system
Type: Transistor module
Spark plug: Champion CJ-8, Champion RJ19LM
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)
Spark plug torque: 18 N·m (1.8 kg·m, 13.3 ft·lb)
Armature air gap 0.25-0.36 mm (0.0098-0.0142 in)

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