2006-2014 Honda FourTrax ATV TRX250 EX TRX250X Service Manual, Page 215Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Coat new O-ring with engine oil and install it into the groove in the countershaft protector
Install the protector and tighten the two boltsInstall the following:reverse stopper shaft (page 10-29) gearshift linkage (page 10-26) flywheel (page 11-10) oil pump (page 5-7) camshaft (page 8-25) clutch (page 10-22) cylinder and piston (page 9-7) cylinder head (page 8-20) engine (page 7-7)