Suzuki RA410 Manual page 314

DISASSEMBLY
1) Using piston ring expander, remove two compression rings (Top
and 2nd) and oil ring from piston.
2) Remove piston pin from connecting rod.
Ease out piston pin circlips (1), as shown.
Force piston pin out.
CLEANING
Clean carbon from piston head and ring grooves, using a suitable
tool.
ENGINE MECHANICAL 6A4-55