Briggs and Stratton 49M877

The Briggs and Stratton 49M877 is a 810 cc (49.4 cu·in) V-twin air-cooled four-stroke internal combustion gasoline engine, manufactured by Briggs and Stratton.

The B&S 49M877 engine has an OHV (overhead valve) design and a vertical PTO shaft. This engine is equipped with float type carburetor and an electronic ignition system. The B&S 49M877 engine used Dual-Clean air cleaner (paper element with a foam pre-cleaner).

Cylinder bore and piston stroke are 83.81 mm (3.3 in) and 73.41 mm (2.89 in), respectively. This engine produced 30.5 PS (22.4 kW; 30.0 HP) at 3,600 rpm of horsepower.

The breakdown of the engine code is as follows:

• 49 – Displacement
• M – Basic design series
• 8 – Vertical PTO-shaft
• 7 – Plain bearing, Pressure lubrication
• 7 – Electric starter

General information

Engine Specifications
Model	B&S 49M877
Type	4-stroke, OHV, V-twin
Displacement	810 cm3 (49.4 cu-in)
Max. horsepower	30.5 PS (22.4 kW; 30.0 HP) at 3,600 rpm
Max. torque	–
Fuel system	Float typet carburetor
Cooling system	Forced-air
Ignition system	Electronic
Lubricating system	Full pressure lubrication system with spin-on oil filter
Starting system	Electric starter
Fuel used	Gasoline
Fuel tank capacity	–

Cylinder Block and Head

Cylinder block
Bore x Stroke		83.81 mm X 73.41 mm (3.30 x 2.89 in)
Number of piston rings (compression / oil):		2 / 1
Cylinder Head
Valve Arrangement:		OHV
Valves:		4 (2 per cylinder)

Service Information

Engine
Max speed	3,600 rpm
Valve clearance
Intake valve clearance	0.10-0.15 mm (0.004-0.006 in)
Exhaust valve clearance	0.10-0.15 mm (0.004-0.006 in)
Oil system
Oil type	API SF, SG, SH, SJ or higher
Recommended oil	Summer: SAE 30, 10W-30 Winter: SAE 5W-30
Oil capacity (with filter)	2.0 liters (2.11 US. qt, 1.76 Imp. qt.)
Ignition system
Spark plug	Champion RC12YC
Spark plug gap	0.7-0.8 mm (0.0276-0.0315 in)