1981-1984 Official Honda ATC250R Shop Manual, Page 98Get this manual
KICKST ARTERTRANSM ISSIONCRANKSHAFT
ATe 250R
CRANKCASE ASSEMBLY
Place new gasket on the crankcase and insert the dowel pins
Assemble the right and left crankcase
NOTE Assemble the right and left crankcases while lightly tapping around them with plastic hammer