1983-1985 Original Honda ATC 200X Shop Manual, Page 79Get this manual
CYLINDERPISTON
PISTON INSTALLATION
Install the piston and piston pinInstall new piston pin clipsNOTE: -P-O-si-t-io-n-t-h-e-p-iston"IN" mark on the intake valve sideInstall the piston pin clips with the end gaps in the 12 o'clock position, towards the top of the pistonDo not let the clip fall into the crankcase