1985-1986 Honda ATC250R Shop Manual, Page 124Get this manual
TRANSM ISSIONC RAN KSHAFT BA LANCE R ASSEMBLY COLLAR 07931-KF00100 or 07945-3710101 Drive new right crankshaft oil seal into place until it is flush with the crankcase surfaceDrive new left crankshaft oil seal into the crankcase until it is mm (0.24 in) from the left end of the case as shown
6 mm (0.24 in)
RIGHT CRANKSHAFT Install the right crankshaft collarCoat new a-ring with grease and install the collar and a-ring onto the countershaft