2007-2009 Honda TRX300EX TRX300X service manual, Page 147Get this manual
CYLINDERlPISTON Apply molybdenum oil solution to piston pin clipsInstall new piston pin clipsNOTE:
Do not align the clip end gap with the piston cutout
Make sure the piston pin clips are seated securely
CYLINDER INSTALLATION
Clean the gasket surface of the crankcase and cylinder thoroughly, being careful not to damage them
Install he two dowel pins and new gasket