Honda BF40D Manual page 126

• VALVE GUIDE REAMING
For best results, be sure the cylinder head is at room
temperature before reaming valve guides.
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1) Coat the reamer and valve guide with cutting oil.
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2) Rotate the reamer clockwise through the valve guide for
the full length of the reamer.
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3) Continue to rotate the reamer clockwise while removing it
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from the valve guide.
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TOOL:
Valve guide reamer, 5.510 mm
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4) Thoroughly clean the cylinder head to remove any cutting
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residue.
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5) Check the valve guide bore; it should be straight, round and
centered in the valve guide. Insert the valve and check for
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smooth movement.
If the valve does not operate smoothly, the guide may have
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Replace the valve guide if it is bent or damaged.
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6) Check the valve stem-to-valve guide clearance (P. 9-17).
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9-20
[1]
VALVE GUIDE
REAMER, 5.510 mm
07984-2000001
07984-2000001
126