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 modelB&S 253707
Engine type4-stroke, L-head (side valve), single-cylinder
Displacement399 cm3, (24.35 cu·in)
Max. horsepower11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm
Max. torque22.7 N·m (2.3 kg·m, 16.7 ft·lb) at 2,800 rpm
Cooling systemForced air
Air cleanerDual element (cartridge and pre-cleaner)
Ignition systemTransistor module
Fuel systemFloat type carburetor
Fuel usedGasoline
Starting systemElectric starter
GovernorCentrifugal governor
PTO shaft rotationCounterclockwise (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)

Tightening torque

Tightening torque specs
Cylinder Head18.6 Nm; 13.8 ft·lb
Connecting Rod20.9 Nm; 15.5 ft·lb
Flywheel Nut87.8 Nm; 65.0 ft·lb
Crankcase Cover15.8 Nm; 11.7 ft·lb
Fuel Shut-Off Valve8.0 Nm; 5.9 ft·lb
Governor Lever Nut7.0 Nm; 5.2 ft·lb
Spark Plug Torque18.0 Nm; 13.5 ft·lb
Oil Drain Plug20.0 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 Screw1-1/2 turn out
Idle Adjustment Screw1 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 gap0.25-0.36 mm (0.0098-0.0142 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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