Briggs & Stratton 550e Series Service Information

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Component Standard Dimensions Reject Dimensions
SAE Metric SAE Metric
Cylinder
Mag Bearing .877 in 22.27 .879 in 22.33 mm
Mag Oil Seal Depth Flush Flush N/A N/A
Cam Bearing .501 in 12.73 mm .502 in 12.75 mm
Bore Out-of-Round N/A N/A .0015 in .04 mm
Cylinder Head
Intake
Valve Seat Angle 45° 45° N/A N/A
Valve Stem .156 in 3.96 mm .154 in 3.91 mm
Valve Guide .158 in 4.01 mm .160 in 4.07 mm
Exhaust
Valve Seat Angle 45° 45° N/A N/A
Valve Stem .156 in 3.96 mm .154 in 3.91 mm
Valve Guide .158 in 4.01 mm .160 in 4.07 mm
Crankcase Cover/Sump
PTO Bearing .877 in 22.27 mm .879 in 22.33 mm
PTO Oil Seal Depth Flush Flush N/A N/A
Cam Bearing .501 in 12.73 mm .502 in 12.75 mm
Crankshaft
Crankpin Journal .874 in 22.20 mm .872 in 22.15 mm
Mag Journal .874 in 22.20 mm .872 in 22.15 mm
PTO Journal .874 in 22.20 mm .872 in 22.15 mm
Cam Shaft
Mag-Side Journal .500 in 12.71 mm .499 in 12.67 mm
PTO Side Journal .500 in 12.71 mm .499 in 12.67 mm
Connecting Rod
Crankpin Bearing .875 in 22.24 mm .876 in 22.26 mm
Piston Pin Bore .491 in 12.46 mm .493 in 12.52 mm
Piston and Pin
Pin Diameter .490 in 12.45 mm .489 in 12.42 mm
Piston Pin Bore .491 in 12.46 mm .493 in 12.52 mm
Piston Rings
End Gap-Top .005 in .13 mm .025 in .64 mm
End Gap-Middle .028 in .71 mm .045 in 1.14 mm
End Gap-Oil .030 in .76 mm .045 in 1.14 mm
Ring Land Clearance-Top .002 in .05 mm .003 in .08 mm
Ring Land Clearance-Middle .001 in .03 mm .002 in .03 mm
Ring Land Clearance-Oil .001 in .03 mm .002 in .06 mm
Starter Rope
Rope Diameter .125 in (#4) 3.17 mm (#4) N/A N/A
Rope Length 88.62 in 2.25 m N/A N/A
Not for Reproduction

Briggs & Stratton 550e Series Specifications

General

Displacement	127 cc
Starting System	Recoil
Stroke	45 mm
Fuel Type	Unleaded gasoline
Engine Type	4-stroke, OHV
Torque	5.5 ft-lbs
Cylinder	1