2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 142Get this manual
CAMSHAFT, ROCKER ARMS AND VALVES 2.Replace: Valve guide
Replacement steps: NOTE: To ease guide removal, installation and to maintain correct fit, heat the cylinder head to 100 (212 F) in an oventhe valve guide using valve guide remover 1Install the new valve guide using valve guide remover and valve guide installer 2After installing the valve guide, bore the valve guide using valve guide reamer to obtain proper stem-to-guide clearanceValve guide remover (7 mm): PNYM-01225-A, 90890-01225 Valve guide installer: PNYM-04017, 90890-04017 Valve guide reamer (7 mm): PNYM-01227, 90890-01227 NOTE: After replacing the valve guide reface the valve seat Remove