2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 236Get this manual
CYLINDERPISTON
CYLINDERPISTON INSTALLATION
PISTON RING INSTALLATION
Carefully install the piston rings into the piston ring grooves with the marks facing upNOTE: Do not confuse the top and second rings To install the oil ring, install the spacer first, then install the side railsStagger the piston ring end gaps 120 apart from each otherStagger the side rail end gaps as shownMARK