1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 132Get this manual
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CYLINDER HIE ADCVUND'ERiPISTON VALVEVALV, GUIDE E
Measure a,nd record each valve guide I.D
SERVICE LlMliI': INEX: 5525mm jO.2i175 Inl'
Subtract each valve stem .0from t