2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 150Get this manual
CYLINDERPISTON Place clean shop towel over the crankcase to prevent the piston pin clip from falling into the crankcaseApply engine oil to the connecting rod small end inner surface
Apply engine oil to the piston pin holes and piston pin outer surfaceSet the piston over the connecting rod with the "IN" mark facing toward the intake side and insert the piston pin through the piston and connecting rod 00 not align the clip Install new piston pin clips into the grooves in the end gap with the piston pin holepiston cutout