Suzuki UF50 Service Manual page 37

3-8 ENGINE
Remove the rear fender.
Loosen the cylinder head nuts diagonally, as shown, and then
remove them.
Remove the cylinder head and gasket.
Remove the cylinder and gasket.
Place a clean rag over the cylinder base to prevent the piston
pin circlip from dropping into the crankcase. Then, remove
the piston pin circlip with long-nose pliers.
Remove the piston pin and piston.
Remove the starter motor.