Briggs and Stratton 289707

Briggs and Stratton 289707The Briggs and Stratton 289707 I/C is a 465 cc, (28.38 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by Briggs & Stratton for general-purpose applications.

It has an 87.3 mm (3.44 in) cylinder bore and 77.7 mm (3.06 in) piston stroke. The B&S 289707 engine produced 12.6 PS (9.3 kW; 12.5 HP) at 3,600 rpm of maximum horsepower.

The Briggs and Stratton 289707 features:

  • Cast iron sleeve
  • L-head (side valve) design
  • Electronic ignition system
  • Float type carburetor
  • Pulse type fuel pump
  • Centrifugal governor
  • Full pressure lubrication system
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine model 289707
Engine type 4-stroke, L-head (side valve), single-cylinder
Displacement 465 cm3, (28.38 cu·in)
Max. horsepower 12.6 PS (9.3 kW; 12.5 HP) at 3,600 rpm
Max. torque
Cooling system Forced air
Air cleaner Paper filter with a foam pre-cleaner
Lubricating system Full pressure
Ignition system Electronic
Fuel system Float type carburetor
Fuel used Gasoline
Starting system Electric starter
Governor Centrifugal governor
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 374 x 344 x 340 mm (14.7 x 13.5 x 13.4 in)
Dry weight 34.5 kg (76.1 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:
Cylinder bore: 87.3 mm (3.44 in)
Piston stroke: 77.7 mm (3.06 in)
Cylinder internal diameter (standard): 87.300-87.400 mm (3.437-3.4409 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)
Side clearance (Top): 0.05-0.12 mm (0.002-0.0047 in)
Side clearance (Second): 0.05-0.12 mm (0.002-0.0047 in)
Side clearance (Oil): 0.05-0.12 mm (0.002-0.0047 in)
Ring end gap (Top): 0.15-0.23 mm (0.0059-0.0091 in)
Ring end gap (Second): 0.35-0.45 mm (0.0138-0.0177 in)
Ring end gap (Oil): 0.15-0.25 mm (0.0059-0.0098 in)
Crankshaft main journal diameter: 35.000 mm (1.378 in)
Crankpin journal diameter: 27.860-27.890 mm (1.0968-1.098 in)
Crankshaft center distance: 38.85 mm (1.53 in)
Cylinder head
Valve arrangement: L-head (side valve), gear driven
Valves: 2
Valve steam diameter (INTAKE): 5.920-5.970 mm (0.2331-0.235 in)
Valve steam diameter (EXHAUST): 5.920-5.970 mm (0.2331-0.235 in)
Camshaft lobe height (INTAKE): 31.49 mm (1.2398 in)
Camshaft lobe height (EXHAUST): 31.49 mm (1.2398 in)

Tightening torque

Tightening torque specs
Air cleaner base 6.0 Nm; 4.4 ft·lb
Alternator 2.0 Nm; 1.5 ft·lb
Armature 3.0 Nm; 2.2 ft·lb
Blower housings 10.0 Nm; 7.4 ft·lb
Blower housing brackets 10.0 Nm; 7.4 ft·lb
Breather 3.0 Nm; 2.2 ft·lb
Carburetor to intake manifold 8.0 Nm; 5.9 ft·lb
Carburetor solenoid 5.0 Nm; 3.7 ft·lb
Connecting rod 17.0 Nm; 12.6 ft·lb
Control bracket 3.0 Nm; 2.2 ft·lb
Crankcase cover 25.0 Nm; 18.5 ft·lb
Cylinder head 25.0 Nm; 18.5 ft·lb
Cylinder shield 5.0 Nm; 3.7 ft·lb
Exhaust manifold / adapter 19.0 Nm; 14.0 ft·lb
Flywheel nut 135.0 Nm; 100.0 ft·lb
Flywheel fan 16.0 Nm; 11.9 ft·lb
Fuel pump 10.0 Nm; 7.4 ft·lb
Governor lever nut 5.0 Nm; 3.7 ft·lb
Intake manifold to cylinder head 10.0 Nm; 7.4 ft·lb
Muffler 10.0 Nm; 7.4 ft·lb
Oil drain plug 11.0 Nm; 8.1 ft·lb
Oil fill tube 10.0 Nm; 7.4 ft·lb
Oil pump cover 10.0 Nm; 7.4 ft·lb
Regulator / rectifier 5.0 Nm; 3.7 ft·lb
Rewind starter 3.0 Nm; 2.2 ft·lb
Rocker ball set screw or nut 5.0 Nm; 3.7 ft·lb
Starter clutch 88.0 Nm; 65.2 ft·lb
Starter motor 16.0 Nm; 11.9 ft·lb
Rocker cover 7.0 Nm; 5.2 ft·lb

Service Data

Valve clearance
Intake valve clearance: 0.08-0.13 mm (0.003-0.005 in)
Exhaust valve clearance: 0.13-0.18 mm (0.005-0.007 in)
Oil system
Lubrication system: Full pressure / Oil slinger
Oil type: SF, SG, SH, SJ or higher
Recommended oil: Summer: SAE 30, 10W-30
Winter: SAE 5W-30
Oil capacity: 1.42 L (1.5 US. qt, 1.25 Imp. qt.)
Fuel system
Type: Float type carburetor
Fuel pump: Pulse type
Ignition system
Type: Electronic
Spark plug: Champion RJ-19LM
Spark plug gap: 0.7-0.8 mm (0.0276-0.0315 in)
Spark plug torque: 20 N·m (2 kg·m, 14.7 ft·lb)
Armature air gap 0.25-0.36 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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