Briggs and Stratton 281707

Briggs and Stratton 281707The Briggs and Stratton 281707 is a 465 cc (28.4 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.

Cylinder bore is 87.3 mm (3.44 in) and piston stroke is 77.7 mm (3.06 in).

The B&S 281707 engine produced 12.2 PS (9.0 kW; 12.0 HP) at 3,600 rpm of maximum horsepower.

The Briggs and Stratton 281707 features:

  • L-head (sidevalve) design
  • Vertical PTO-shaft
  • Cast iron sleeve
  • Electronic ignition system
  • Float type carburetor
  • Centrifugal governor
  • Full pressure lubrication system
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine modelB&S 281707
Engine type4-stroke, L-head, single-cylinder
Displacement465 cm3, (28.4 cu·in)
Max. horsepower12.2 PS (9.0 kW; 12.0 HP) at 3,600 rpm
Max. torque
Cooling systemForced air
Air cleanerPaper filter with a foam pre-cleaner
Lubricating systemFull pressure / Oil slinger
Ignition systemElectronic
Fuel systemFloat type carburetor
Fuel usedGasoline
Starting systemElectric starter
Stoping systemIgnition primary circuit ground
GovernorCentrifugal governor

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)
Cylinder head
Valve arrangement:L-head
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 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
Breather3.0 Nm; 2.2 ft·lb
Carburetor to intake manifold8.0 Nm; 5.9 ft·lb
Carburetor solenoid5.0 Nm; 3.7 ft·lb
Connecting rod17.0 Nm; 12.6 ft·lb
Control bracket3.0 Nm; 2.2 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 pump10.0 Nm; 7.4 ft·lb
Governor lever nut5.0 Nm; 3.7 ft·lb
Intake manifold to cylinder head10.0 Nm; 7.4 ft·lb
Muffler10.0 Nm; 7.4 ft·lb
Oil drain plug11.0 Nm; 8.1 ft·lb
Oil fill tube10.0 Nm; 7.4 ft·lb
Oil pump cover10.0 Nm; 7.4 ft·lb
Regulator / rectifier5.0 Nm; 3.7 ft·lb
Rewind starter3.0 Nm; 2.2 ft·lb
Rocker ball set screw or nut5.0 Nm; 3.7 ft·lb
Starter clutch88.0 Nm; 65.2 ft·lb
Starter motor16.0 Nm; 11.9 ft·lb
Rocker cover7.0 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
Ignition system
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 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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