Suzuki DF9,9 Service Manual page 131

5. Remove the camshaft.
NOTE:
Pull out camshaft toward oil pan side.
6. Using valve lifter and attachment, remove valve cotters 1
while compressing valve spring.
 09916-14510 : Valve lifter
09916-14521 : Attachment
09916-84511 : Tweezers
7. Remove valve spring retainer 2, valve spring 3 and valve
4.
8. Remove valve stem seal 5 and valve spring seat 6.
POWER UNIT 6-11