Briggs and Stratton 28M707

Briggs and Stratton 28M707The Briggs and Stratton 28M707 is a 465 cc (28.38 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine, manufactured by Briggs and Stratton.

The B&S 28M707 engine has an L-head (side valve) design and a vertical PTO shaft. This engine is equipped with float type carburetor and an electronic ignition system. The B&S 28M707 engine used a paper air filter with a foam pre-cleaner.

The cylinder bore is 87.30 mm (3.44 in) and the piston stroke is 77.7 mm (3.06 in). This engine produced 13.1 PS (9.6 kW; 13.0 HP) at 3,300 rpm of horsepower.

The breakdown of the engine code is as follows:

  • 28 – Displacement
  • M – Basic design series
  • 7 – Vertical PTO-shaft
  • 0 – Plain bearing
  • 7 – Electric starter

General information

Engine Specifications
ModelB&S 28M707
Type4-stroke, L-head, single-cylinder
Displacement465 cm 3 (28.38 cu-in)
Max. horsepower13.1 PS (9.6 kW; 13.0 HP) at 3,300 rpm
Max. torque
Fuel systemCarburetor
Cooling systemForced-air
Ignition systemElectronic
Lubricating system
Starting systemElectric starter
Fuel usedGasoline
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Compression ratio:
Bore x Stroke87.3 mm X 77.7 mm (3.44 x 3.06 in)
Sleeve internal diameter87.300-87.400 mm (3.437-3.4409 in)
Number of piston rings (compression / oil):2 / 1
Side clearanceTop0.03-0.07 mm (0.0012-0.0028 in)
Second0.03-0.07 mm (0.0012-0.0028 in)
Oil0.03-0.07 mm (0.0012-0.0028 in)
Ring end gapTop0.15-0.35 mm (0.0059-0.0138 in)
Second0.15-0.35 mm (0.0059-0.0138 in)
Oil0.35-0.70 mm (0.0138-0.0276 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
Valve steam diameterINTAKE5.960-5.980 mm (0.235-0.235 in)
EXHAUST5.960-5.980 mm (0.235-0.235 in)

Tightening torque specs

Tightening torque specs
Air cleaner base6.0 Nm; 4.4 ft·lb
Alternator2.0 Nm; 1.5 ft·lb
Armature3.0 Nm; 2.2 ft·lb
Blower housings10.0 Nm; 7.4 ft·lb
Blower housing brackets10.0 Nm; 7.4 ft·lb
Breather4.0 Nm; 2.9 ft·lb
Carburetor to intake manifold7.0 Nm; 5.2 ft·lb
Connecting rod21.0 Nm; 15.6 ft·lb
Control bracket5.0 Nm; 3.7 ft·lb
Crankcase cover25.0 Nm; 18.5 ft·lb
Cylinder head25.0 Nm; 18.5 ft·lb
Cylinder shield5.0 Nm; 3.7 ft·lb
Exhaust manifold / adapter19.0 Nm; 14.0 ft·lb
Flywheel nut135.0 Nm; 100.0 ft·lb
Flywheel fan16.0 Nm; 11.9 ft·lb
Fuel pump5.0 Nm; 3.7 ft·lb
Governor lever nut5.0 Nm; 3.7 ft·lb
Intake manifold to cylinder head10.0 Nm; 7.4 ft·lb
Muffler19.0 Nm; 14.1 ft·lb
Oil drain plug14.0 Nm; 10.4 ft·lb
Oil pump cover10.0 Nm; 7.4 ft·lb
Starter motor16.0 Nm; 11.9 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 clearance0.13-0.18 mm (0.005-0.007 in)
Oil system
Oil typeAPI SF, SG, SH, SJ or higher
Recommended oil Summer: SAE 30, 10W-30
Winter: SAE 5W-30
Oil capacity (with filter)1.40 L (1.48 US. qt, 1.23 Imp. qt.)
Ignition system
Spark plugChampion 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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