2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 196Get this manual
CYLINDERPISTON CYLINDER INSTALLATION Clean the gasket surfaces of the cylinder and crankcase thoroughly, being careful not to damage them, and being careful not to allow gasket material into the crankcaseBlow through the oil passage (stud bolt hole) in the cylinder with compressed airInstall the cam chain guide into the crankcase so that its end rests in the groove properly as shownCAM CHAIN GUIDE
Install the dowel pins and new gasketDOWEL PINS
GASKET Apply engine oil to the cylinder wall, piston outer surface and piston ringsBe careful not to damage the piston rings and cylinder wall