Wilky, go with oem seals and bearing in the lower end yes. I believe their specs have much tighter tolerances than any aftermarket brands. Oem crank is always going to be the desired choice by many guys. They would probably recommend sending the crank out having it rebuilt and a new oem rod put on. I have 2 oem cranks in need of that myself but I opted for a hot rod crank and rod assembly. I wanted my motor back together, and didn't have the time to wait on my crank being rebuilt. One day I will have both redone and installed but until than I'm fine with the hotrod assembly. I'm sure someone who has knowledge of the 85-86 thrust washer question may chime in here but otherwise just look through he engine section of the forum here I'm sure that question has been asked before. I have two LT250R but they are later years and I run the washers with rm wristpin bearing.