Suzuki DF 25 Service Manual page 137

7-20 POWER UNIT
5. Using valve lifter and attachment, remove valve cotters 1
while compressing valve spring.
09916-14510 : Valve lifter
09916-14910 : Attachment
09916-84511 : Tweezers
6. Remove valve spring retainer 2 , valve spring 3 and valve
4 .
7. Remove valve stem seal 5 and valve spring seat 6 .
NOTE:
Reassemble each valve and valve spring in their original
posi-tions.