2004-2005 Honda TRX450R Factory Sevice Manual, Page 170Get this manual
CYLINDERPISTON Apply engi ne il to the pi st pi hol esInsta ll he piston it the -IN" mark towa rd he intake side and insert th piston pin hro ug the pis-
PISTON PIN
ton and co nnect ing rod Do not align the clip end gap WIth the ptstan cutout
Install new piston pin clipsNOT E:
Make su re th piston pin clips are seated secu rely
CYLINDER INSTALLATION