The Briggs and Stratton 311777 Intek is a 501 cc, (30.6 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.
A 90.6 mm (3.57 in) cylinder bore and 77.8 mm (3.06 in) piston stroke give the B&S 311777 engine a total of 501 cc of displacement. This engine produced 17.1 PS (12.6 kW; 17.0 HP) at 3,600 rpm of horsepower.
The B&S 311777 features:
- Cast iron sleeve
- OHV (overhead) design
- Plain bearing
- Electronic ignition system
- Float type carburetor
- Mechanical governor
- Full pressure lubrication system
- Forced air cooling system
- Electric starter
General information
Engine Specifications | |
Engine model | 311777 Intek |
Engine type | 4-stroke, OHV, single-cylinder |
Displacement | 501 cm3, (30.6 cu·in) |
Max. horsepower | 17.1 PS (12.6 kW; 17.0 HP) at 3,600 rpm |
Max. torque | – |
Cooling system | Forced air |
Air cleaner | Paper filter with a foam pre-cleaner |
Lubricating system | Full pressure lubrication system |
Ignition system | Electronic |
Fuel system | Float type carburetor |
Fuel used | Gasoline |
Starting system | Electric starter |
Governor | Mechanical governor |
Dimensions (L x W X H) | – |
Dry weight | – |
Cylinder Block and Head
Cylinder block | |
Cylinder bore: | 90.6 mm (3.57 in) |
Piston stroke: | 77.7 mm (3.06 in) |
Cylinder internal diameter (standard): | 90.500-90.600 mm (3.563-3.5669 in) |
Number of piston rings (compression / oil): | 2/1 |
Connecting rod small end diameter (standard): | 20.330-20.370 mm (0.8004-0.802 in) |
Piston pin diameter: | 20.310-20.290 mm (0.7996-0.7988 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): | 0.150-0.230 mm (0.0059-0.0091 in) |
Ring end gap (Second): | 0.350-0.450 mm (0.0138-0.0177 in) |
Ring end gap (Oil): | 0.150-0.250 mm (0.0059-0.0098 in) |
Crankshaft main journal diameter: | 35.000 mm (1.378 in) |
Crankpin journal diameter: | 38.050 mm (1.498 in) |
Crankshaft center distance: | 38.9 mm (1.53 in) |
Cylinder head | |
Valve arrangement: | OHV |
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): | 31.490 mm (1.2398 in) |
Camshaft lobe height (EXHAUST): | 31.490 mm (1.2398 in) |
Camshaft journal diameter: | 12.670 mm (0.4988 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 | 5.0 Nm; 3.7 ft·lb |
Crankcase sump | 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 |
Rocker cover | 7.0 Nm; 5.2 ft·lb |
Starter motor | 16.0 Nm; 11.9 ft·lb |
Service Data
Valve clearance | |
Intake valve clearance: | 0.08-0.13 mm (0.003-0.005 in) |
Exhaust valve clearance: | 0.13-0.17 mm (0.005-0.007 in) |
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 RC12YC |
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) |
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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