2001-2003 Honda TRX500FA Factory Service Manual, Page 142Get this manual
CYLINDER HEA DVALVE Using 45G seat curter, cut th seat to the proper width
VALVE SEATWIDTH: 1.0-1 .1 mm (0.039-0.043 in )
Make su re hat all in ing an rregu lar itie ar removed
Exc essi ve lappmg pressure may deform ()t" damage
After cutting th seat, appl lapp ing compo und to he valve ace, and lap the va lve using ig ht pressu reChange the angle of lapping ool frequently to revent the seatuneven seat we ar
Do nor alk1wseopmg compound to After lappi ngwash any res idual compound off the