1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 137Get this manual
CYLINDER HEADCVLlNDERPISTON
CYLINDE.HEAD ASSEMBL R
CYLI NDER HEAD
INNER _ SPRING
SEAL SPRING SEAT
1iiiii" O-flIING
EXHAUST VALVE ""-
INTAKE VALVE