1997-2004 Honda Fourtrax Recon TRX250TE/TM Service Manual, Page 126Get this manual
CYLINDER HEADCYLINDERPISTON If the contact area is too low on the valve, the seat must be raised using 50-degree inner cutterRefinish the seat to specifications, using 45degree finish cutter
CONTACT TOO LOW
After cutting the seat, apply lapping compound to the valve face, and lap the valve using light pressureDo not allow lapping compound