Briggs and Stratton 252707

B&S 252707The Briggs and Stratton 252707 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 252707 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 252707 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
  • 2 – Basic design series
  • 7 – Vertical PTO-shaft
  • 0 – Plain bearing
  • 7 – Electric starter

General information

Engine Specifications
ModelB&S 252707
Type4-stroke, L-head, single-cylinder
Displacement399 cm 3 (24.3 cu-in)
Max. horsepower11.2 PS (8.2 kW; 11 HP) at 3,600 rpm
Max. torque22.7 N·m (2.3 kg·m, 16.7 ft·lb) at 2,800 rpm
Fuel systemCarburetor
Cooling systemForced-air
Ignition systemTransistor module
Lubricating system
Starting systemElectric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Compression ratio:
Bore x Stroke87.3 mm X 66.7 mm (3.44 x 2.63 in)
Sleeve internal diameter87.290-87.310 mm (3.4366-3.4374 in)
Number of piston rings (compression / oil):2 / 1
Ring end gapCompression ring0.89 mm (0.035 in)
Oil ring1.14 mm (0.0449 in)
Connecting rod small end ID20.330-20.370 mm (0.8004-0.802 in)
Piston pin outer diameter20.290-20.310 mm (0.7988-0.7996 in)
Cylinder Head
Valve Arrangement:L-head (sidevalve)
Valves:2

Tightening torque specs

Tightening torque specs
Cylinder 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 Information

Engine
Max speed3,600 rpm
Valve clearance
Intake valve clearance0.08-0.13 mm (0.003-0.005 in)
Exhaust valve clearance0.13-0.15 mm (0.005-0.006 in)
Oil system
Oil typeAPI 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 plugChampion: CJ-8 or RJ19LM
Spark plug gap0.7-0.8 mm (0.0276-0.0315 in)
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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.

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