If you go by a Honda parts fich and have ALL of the shown spacers and washers in place there is no reason to have to shim the shaft. I'd go over the shaft and recheck it for all of the correct pieces. Some end play is normal.
Steve in SF
87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project