2001-2003 Honda TRX500FA Factory Service Manual, Page 156Get this manual
CYLINDERPISTON PISTON INSTALLATION Place clean shop towel ov er the crankcase to revent the piston pin clip from falling int the crankcase Apply molybdenum oil solution to he piston pin
outer su rfaceApply eng ine oil to the pi ston pin hole nd co necting rod inner su rf aceInstall he piston ith thIW' mark oward he int ake sid and in sert the pist on pin through th pist on and
connec ting rod Inst all new piston pin clips into he grooves in he pis ton pin hol eNOTE: Make su re that the piston pin clips are seated