2006 Honda TRX680 Rincon Factory Service Manual, Page 235Get this manual
CYLINDERPISTON CYLINDER INSTALLATION Clean the gasket surface of the 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 its end rests in the groove properly
CHAIN GUIDE
Install the dowel pins and new gasketApply engine oil to the cylinder wall, piston outer surface and piston rings
Be careful not to Route the cam chain through the cylinder and install damage the piston the cylinder over the piston while compressing the rings and cylinder piston rings with your fingerswallAlign the cam chain guide bosses with the grooves