Suzuki F6A Service Manual page 62

19) Loosen all valves adjusting screws fully. Leave
screws in place.
20) Remove rocker arm shaft caps.
21) Remove intake rocker arm shaft.
22) Remove camshaft caps, camshaft and exhaust
rocker arms.
23) Remove cylinder head.
60
a) Use valve lifter and attachment to compress valve
spring in order to free valve retainer pieces for removal.
In this way, remove valve spring and valves.
b) Remove valve stem oil seal from guide, and then valve
spring seat.
NOTE:
Do not reuse oil seal once disassembled. Be sure to
use new oil seal when assembling.