Briggs and Stratton 400707

Briggs and Stratton 400707The Briggs and Stratton 400707 is a 694 cc, (42.35 cu·in) natural aspirated, opposed two-cylinder, four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, for general-purpose applications.

Cylinder bore is 87.3 mm (3.44 in) and piston stroke is 55.0 mm (2.16 in). The Briggs and Stratton 400707 engine produced 16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm of maximum output power and 34.8 N·m (3.5 kg·m, 25.6 ft·lb) at 2,700 rpm of peak torque.

The Briggs and Stratton 400707 features:

  • L-head design
  • Flywheel magneto ignition system
  • Float type carburetor
  • Mechanical governor
  • Full pressure lubrication system
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine modelB&S 400707
Engine type4-stroke, L-head, opposed two-cylinder
Displacement694 cm3, (42.35 cu·in)
Max. horsepower16.2 PS (11.9 kW; 16.0 HP) at 3,600 rpm
Max. torque34.8 N·m (3.5 kg·m, 25.6 ft·lb) at 2,700 rpm
Cooling systemForced air
Air cleanerPaper cartridge with a foam pre-cleaner
Lubricating systemFull pressure
Ignition systemFlywheel magneto
Fuel systemFloat type carburetor
Fuel usedGasoline
Starting systemElectric starter
GovernorMechanical governor

Cylinder Block and Head

Cylinder block
Cylinder bore:87.3 mm (3.44 in)
Piston stroke:58.0 mm (2.28 in)
Cylinder internal diameter (standard):87.280-87.310 mm (3.4362-3.4374 in)
Number of piston rings (compression / oil):2/1
Connecting rod big end diameter (standard):41.270-41.280 mm (1.6248-1.6252 in)
Connecting rod small end diameter (standard):20.340-20.350 mm (0.8008-0.8012 in)
Piston pin diameter:20.320-20.330 mm (0.8-0.8004 in)
Side clearance (Top):0.090-0.150 mm (0.0035-0.0059 in)
Side clearance (Second):0.090-0.150 mm (0.0035-0.0059 in)
Side clearance (Oil):0.090-0.150 mm (0.0035-0.0059 in)
Ring end gap (Top):0.180-0.430 mm (0.0071-0.0169 in)
Ring end gap (Second):0.180-0.430 mm (0.0071-0.0169 in)
Ring end gap (Oil):0.180-0.430 mm (0.0071-0.0169 in)
Crankshaft main journal diameter:34.990-35.010 mm (1.3776-1.3783 in)
Crankpin journal diameter:41.230-41.250 mm (1.6232-1.624 in)
Crankshaft center distance:27.5 mm (1.085 in)
Cylinder head
Valve arrangement:L-head, gear driven
Valves:2(4 valves in total)
Valve steam diameter (INTAKE):7.820-7.870 mm (0.3079-0.3098 in)
Valve steam diameter (EXHAUST):7.820-7.870 mm (0.3079-0.3098 in)
Camshaft lobe height (INTAKE):29.270-29.350 mm (1.1524-1.1555 in)
Camshaft lobe height (EXHAUST):28.500-28.580 mm (1.122-1.1252 in)
Camshaft journal diameter :15.850-15.870 mm (0.624-0.6248 in)

Tightening torque

Tightening torque specs
Alternator (to cylinder)2.0 Nm; 1.5 ft·lb
Air cleaner base (to carburetor)3.0 Nm; 2.2 ft·lb
Armature3.0 Nm; 2.2 ft·lb
Blower housings10.0 Nm; 7.4 ft·lb
Breather3.0 Nm; 2.2 ft·lb
Carburetor to intake manifold11.0 Nm; 8.1 ft·lb
Connecting rod22.0 Nm; 16.3 ft·lb
Crankcase sump/cover25.0 Nm; 18.5 ft·lb
Cylinder head18.0 Nm; 13.3 ft·lb
Carburetor to solenoid11.0 Nm; 8.1 ft·lb
Fan Retainer17.0 Nm; 12.6 ft·lb
Flywheel nut203.0 Nm; 150.0 ft·lb
Governor lever nut11.0 Nm; 8.1 ft·lb
Intake manifold to cylinder head10.0 Nm; 7.4 ft·lb
Starter motor18.0 Nm; 13.3 ft·lb

Service Data

Oil system
Lubrication system:Full pressure
Oil type:SC, SD, SE or higher
Recommended oil: Summer: SAE 30, 10W-30
Winter: SAE 5W-30
Oil capacity:1.70 L (1.8 US. qt, 1.5 Imp. qt.)
Fuel system
Type:Float type carburetor
Ignition system
Type:Flywheel magneto
Spark plug: Champion RJ-12,
AC R-46,
Autolite 308
Spark plug gap:0.7-0.8 mm (0.0276-0.0315 in)
Spark plug torque:22 N·m (2.2 kg·m, 16.2 ft·lb)
Point gap0.51 mm (0.020 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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