1987 Honda Fourtrax TRX 250X Service Manual, Page 133Get this manual
CRANKCASEITRANSMISSIONfCRANKSHAFT Install the dowel pin and bearing set rings on the reverse shift drumInstall the bearing holder aligning the hole with the dowel pin on the reverse shift drumTighten the bolts securely_ (11 HOLDER (2) HOLE
Install the bushings with its oil hole aligning with the hole in the shaftInstall the snap rings onto the mainshaft with their round surfaces facing against the M4, M5 gears