The Briggs and Stratton 252412 is a 399 cc (24.3 cu·in) single-cylinder, air-cooled, four-stroke cycle, internal combustion gasoline engine with horizontal PTO-shaft, manufactured by Briggs and Stratton.
The Briggs and Stratton 252412 engine has a L-head (side valve) design and a horizontal PTO shaft. The B&S 252412 engine is equipped with flo-jet type carburetor, an transistor module ignition system, splash type lubrication system and rewind starter.
A 87.30 mm (3.44 in) cylinder bore and 66.7 mm (2.63 in) piston stroke give the Briggs and Stratton 252412 engine a total 399 cc (24.3 cu·in) of displacement. This engine produced 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm of maximum horsepower.
The breakdown of the engine code is as follows:
- 25 – Displacement
- 2 – Basic design series
- 4 – Horizontal PTO-shaft, Flo-jet carburetor
- 1 – Plain bearing
- 2 – Rewind starter
General information
| Engine Specifications | |
| Model | B&S 252412 |
| Type | 4-stroke, L-head, single-cylinder |
| Displacement | 399 cm 3 (24.3 cu-in) |
| Max. horsepower | 11.2 PS (8.2 kW; 11.0 HP) at 3,600 rpm |
| Max. torque | – |
| Fuel system | Flo-jet carburetor |
| Cooling system | Forced-air |
| Ignition system | Transistor module |
| Lubrication system | Splash type |
| Starting system | Rewind starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | – |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | – | |
| Bore x Stroke | 87.3 mm X 66.7 mm (3.44 x 2.63 in) | |
| Sleeve internal diameter | 87.290-87.310 mm (3.4366-3.4374 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring groove clearance | 0.228 mm (0.009 in) | |
| Ring end gap (compression ring) | 0.890 mm (0.035 in) | |
| Ring end gap (oil ring) | 1.140 mm (0.045 in) | |
| Piston pin outer diameter | 20.290 mm (0.799 in) | |
| Pin bore inner diameter | 20.350 mm (0.801 in) | |
| Connecting rod small end bearing | 20.370 mm (0.802 in) | |
| Connecting rod big end bearing | 31.800 mm (1.252 in) | |
| Crankshaft main journal diameter |
PTO side: 34.950 mm (1.376 in) Magneto side: 34.950 mm (1.376 in) |
|
| Crankpin diameter | 31.670 mm (1.2469 in) | |
| Cylinder Head | ||
| Valve Arrangement: | L-head (sidevalve) | |
| Valves: | 2 | |
| Cam gear journal diameter: | 12.650 mm (0.498 in) | |
| Cam lobe: | 30.070 mm (1.1839 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder Head | 19.0 Nm (1.9 kgf·m; 14 ft·lb) |
| Connecting Rod | 21.0 Nm (2.1 kgf·m; 15.5 ft·lb) |
| Flywheel Nut | 87.8 Nm (9 kgf·m; 64.8 ft·lb) |
| Crankcase Cover | 16.0 Nm (1.6 kgf·m; 11.8 ft·lb) |
| Fuel Shut-Off Valve | 8.0 Nm (0.8 kgf·m; 5.9 ft·lb) |
| Governor Lever Nut | 7.0 Nm (0.7 kgf·m; 5.2 ft·lb) |
| Spark Plug Torque | 18.0 Nm (1.8 kgf·m; 13.3 ft·lb) |
| Oil Drain Plug | 20.0 Nm (2 kgf·m; 14.8 ft·lb) |
Service Information
| Engine | |
| Max speed | 3,600 rpm |
| Valve clearance | |
| Intake valve clearance | 0.13-0.18 mm (0.005-0.007 in) |
| Exhaust valve clearance | 0.23-0.28 mm (0.009-0.011 in) |
| Oil system | |
| Oil type | API SF, SG, SH, SJ or higher |
| Recommended oil |
Summer: SAE 30, 10W-30 Winter: SAE 5W-20, 5W-30 |
| Oil capacity (with filter) | 1.4 liters (1.5 US.qts, 1.24 Imp. qts) |
| Ignition system | |
| Spark plug | Champion CJ-8 |
| Spark plug gap | 0.762 mm (0.030 in) |
| Ignition armature air gap | 0.254-0.356 mm (0.010-0.014 in) |
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