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Briggs and Stratton 28R707 Specs
The Briggs and Stratton 28R707 is a 465 cc (28.4 cubic inches) single-cylinder air-cooled 4-cycle internal combustion gasoline engine, manufactured by Briggs and Stratton.
The Briggs 28R707 engine has an L-head (side valve) design and a vertical PTO shaft. This engine is equipped with float type carburetor and an electronic ignition system. The engine used a paper air filter with a foam pre-cleaner.
The cylinder bore is 87.30 mm (3.44 in) and the piston stroke is 77.7 mm (3.06 in). This engine output 13.6 PS (10.0 kW; 13.5 HP) at 3,300 rpm of maximum power.
Engine code identification:
28 - Total displacement,
R - Basic design series,
7 - Vertical PTO-shaft,
0 - Plain bearing,
7 - Electric starter.
| General Technical Data |
Engine Model ................ Briggs and Stratton 28R707 I/C
Engine Type ................ 4-cycle single cylinder OHV vertical shaft air-cooled gasoline engine
Number of Cylinders ................ 1
Displacement, cu.in (cc) ................ 28.38 (465)
Cylinder Bore, in (mm) ................ 3.44 (87.0)
Piston Stroke, in (mm) ................ 3.06 (78.0)
Rated Engine Power, hp (kW) ................ 13.5 (10.0)
Rated Engine Speed, rpm ................ 3300
Idle Speed, rpm ................ 1200
Cylinder Bore Type ................ Cast iron sleeve
Air Cleaner ................ Paper filter with a foam pre-cleaner
Cooling System ................ Forced air
Ignition System ................ Electronic
Starting System ................ Electric starter
Electrical System Rating, Volts ................ 12
| Fuel System |
Fuel System Type ................ Carburetor
Carburetor Type ................ Float
Fuel Pump ................ Pulse type
Governor Type ................ Mechanical
Fuel Type ................ Gasoline
| Cylinder Block |
Cylinder Bore I.D. (Standard), in (mm) ................ 3.437 (87.30)
Cylinder Bore I.D. (Maximum), in (mm) ................ 3.441 (87.40)
Cylinder Bore (Out-Of-Round), in (mm) ................ 0.0015 (0.04)
Main Bearing Bore Diameter (Cylinder Block), in (mm) ................ 1.3776 (34.99)
Camshaft Bearing Bore Diameter (Cylinder Block), in (mm) ................ 0.5015 (12.74)
Main Bearing Bore I.D. (Crankcase Cover), in (mm) ................ 1.3776 (34.99)
Camshaft Bearing Bore I.D. (Crankcase Cover), in (mm) ................ 0.501 (12.72)
Crank Pin Journal O.D. (Standard), in (mm) ................ 1.2489 (31.72)
Crank Pin Journal O.D. (Wear Limit), in (mm) ................ 1.2478 (31.69)
Crankshaft Journal O.D. (Magneto Side), in (mm) ................ 1.3759 (34.95)
Crankshaft Journal O.D. (PTO Side), in (mm) ................ 1.3759 (34.95)
Crankshaft End Play, mm (in) ................ 0.002-0.023 (0.05-0.58)
Camshaft Journal O.D. (Magneto Side), in (mm) ................ 0.500 (12.70)
Camshaft Journal O.D. (PTO Side), in (mm) ................ 0.500 (12.70)
Connecting Rod Big End I.D. (Standard), in (mm) ................ 1.2505 (31.76)
Connecting Rod Big End I.D. (Wear Limit), in (mm) ................ 1.2525 (31.81)
Connecting Rod Small End I.D. (Standard), in (mm) ................ 0.8006 (20.33)
Connecting Rod Small End I.D. (Wear Limit), in (mm) ................ 0.802 (20.37)
Cam Lobes (Intake), in (mm) ................ 1.2213 (21.02)
Cam Lobes (Exhaust), in (mm) ................ 1.2213 (21.02)
| Cylinder Head and Valves |
Cylinder Head (Max Out of Flatness), in (mm) ................ 0.004 (0.10)
Valve Clearance (Intake), in (mm) ................ 0.003-0.005 (0.08-0.13)
Valve Clearance (Exhaust), in (mm) ................ 0.005-0.007 (0.13-0.18)
Intake Valve Seat Angle, deg ................ 45
Exhaust Valve Seat Angle, deg ................ 45
Valve Guide I.D. (Standard), in (mm) ................ 0.238 (6.05)
Valve Guide I.D. (Wear Limit), in (mm) ................ 0.240 (6.10)
Valve Stem O.D. (Standard), in (mm) ................ 0.2354 (5.98)
Valve Stem O.D. (Wear Limit), in (mm) ................ 0.2346 (5.96)
Intake Valve Seat Width, in (mm) ................ 0.0470-0.0782 (1.190-1.987)
Exhaust Valve Seat Width, in (mm) ................ 0.0630-0.0779 (1.590-1.980)
| Piston and Piston Rings |
Piston Pin O.D. (Standard), in (mm) ................ 0.8005 (20.33)
Piston Pin O.D. (Wear Limit), in (mm) ................ 0.8001 (20.31)
Piston Pin Bearing I.D. (Standard), in (mm) ................ 0.8009 (20.34)
Piston Pin Bearing I.D. (Wear Limit), in (mm) ................ 0.8012 (20.36)
Top Ring End Gap (Standard), in (mm) ................ 0.006-0.014 (0.15-0.35)
Middle Ring End Gap (Standard), in (mm) ................ 0.006-0.014 (0.15-0.35)
Oil Ring End Gap (Standard), in (mm) ................ 0.014-0.028 (0.35-0.70)
Top/Middle Ring End Gap (Wear Limit), in (mm) ................ 0.030 (0.76)
Oil Ring End Gap (Wear Limit), in (mm) ................ 0.065 (1.65)
Top Ring Side Clearance (Standard), in (mm) ................ 0.001-0.003 (0.03-0.07)
Middle Ring Side Clearance (Standard), in (mm) ................ 0.001-0.003 (0.03-0.07)
Oil Ring Side Clearance (Standard), in (mm) ................ 0.001-0.003 (0.03-0.07)
Piston Ring Side Clearance (Wear Limit) ................ 0.006 (0.15)
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