1995-2003 Honda Foreman TRX400FW TRX400 TRX 400 400FW Service Manual, Page 121Get this manual
CYLINDER HEAD CYLINDER PISTON Use deg.ees to .emove the of the -,.I 60 the Cune.cunerinspect the areBbonom 1(refacedold Remove and you have (I) OLD SEAT WIOTH
InStill(5 degrees finish cutter and cui Ihe seat to Ihe proper widlhMake Su.e Ihat all pining Ind irr8(jularitie& are .emovedRefinish if netII"ary
ApplV thin coating P.ussian Blue to the v,lve se81"'!WI the valve through the valve guide and ontO the seat to make cleapellernNOTE