Briggs & Stratton 130G00 Repair Manual page 55

54
Intake Valve Stem Diameter
Models
130G00, 131G00, 13R200
13U100, 13U200
6. Measure the top, center and bottom of the exhaust valve
stem. Replace the exhaust valve if any measurement
is at the reject size shown.
Exhaust Valve Stem Diameter
Models
130G00, 131G00, 13R200
13U100, 13U200
7. Hold each valve against a worn wire wheel in a bench
grinder to remove all carbon deposits from the valve
head and face, but exercise caution to avoid removing
any metal material.
8. Inspect intake valve face and seat. If only minimal wear
is found, lap the valve face and seat as follows:
A. Obtain fine Valve Lapping Compound (Part No.
94150).
B. Apply lapping compound sparingly around the entire
valve face and valve seat.
C. Lightly lubricate the valve guide and valve stem
with clean engine oil.
D. See A of Figure 55. From the bottom of the cylinder
head, insert the valve stem into the valve guide.
E. Push on bottom of valve until it contacts the valve
seat.
F. Obtain the Valve Lapping Tool (Part No. 19258).
G. See B of Figure 55. Attach suction cup at end of
tool to valve head. Holding shank of tool between
the palms of both hands, oscillate the tool
approximately 20° back and forth a few times.
H. Remove valve from the cylinder head and
thoroughly clean the valve face and valve seat of
Reject Size
0.208 in (5.28 mm) or less
0.210 in (5.32 mm) or less
Reject Size
0.210 in (5.32 mm) or less
0.208 in (5.28 mm) or less
any lapping compound. Use a clean rag dipped in
mineral spirits for good results.
I. See C of Figure 55. Carefully inspect the seating
surface on the valve face. A properly lapped valve
shows a gray, frosty seating surface located near
the center of the valve face. Verify that the lapped
surface extends evenly and completely around the
entire valve face with a contact area 0.047-0.063
inches (1.19-1.59 mm) wide.
Carefully inspect the seating surface on the valve
seat. The valve seat should also show an unbroken
lapped finish of uniform width.
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