2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 114Get this manual
CYLINDERPISTONCAMSHAFT The gasket will come off eaSier If II IS soaked in
Clean the gasket surface of the crankcase thoroughly, being careful not to damage it, and careful not to allow gasket material into the crankcase
solvent
Install the dowel pins and new gasket
Apply engine oil to the cylinder bore, piston and piston ring outer surfacesBe careful nor to damage the pison rings and cylinder wall