1999-2004 Honda TRX400EX FourTrax Service Manual, Page 117Get this manual
CYLINDERPISTON
PISTONCYLINDER INSTALLATION
PISTON RING INSTALLATION
Carefully install the piston rings into the piston ring grooves with the markings facing up
D TOPRING
SECOND RING
CAUTION:
Be careful not to damage the piston and rings during installafionNOTE:
OIL RING