1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 140Get this manual
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CYLlNDEI EADCYLINDERPISTON RH Install the ollowin g:
In.s talla new cylinder head cover gasketInstall new O-ring intoth,e groove of tl1e rocker arm hOldeI'
Install the cylinder head