2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 195Get this manual
CYLINDERPISTON
CYLINDERPISTON INSTALLATION
PISTON RING INSTALLATION
Be careful not to damage the piston and rings
Carefully install the piston rings into the piston ring grooves with the markings facing up 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 degrees apart from each otherStagger the side rail end gaps as shown120 TOP RING 120 120 SECOND RING OIL RING MARKING
20 mm or more SIDE RAILS