2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 136Get this manual
CYLINDERPISTON
CYLINDER INSTALLATION
Install the dowel pins and new gasket
Apply frash engine oil 10 the cy linder wall, piston outer surface and piston ringsRoute the cam chain through tha cylinderInstall he cylinder over Ihe piston rings by hand while com pressing the piston rings