Honda BF40D Manual De Instrucciones página 106

12) Remove the valve spring retainer, valve spring, valve, valve
stem seal and the valve spring seat from the cylinder head.
Check the valve for chipping and excessive carbon
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deposits. Clean the valve if necessary.
Replace the valve stem seal with a new one on reassembly.
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9-10
[1]
VALVE SPRING
[5]
VALVE STEM
SEAL
[4]
VALVE
SPRING SEAT
[3]
VALVE
106
[2]
VALVE SPRING
RETAINER