New project? - Infos needed

Hi all,

I’m looking for a new project. I may be a PC12.

What I found until now: 84 models suffer from weak crankshaft. Honda modified it for 85 and later. they don’t have the pitting on the camshafts. There is an 86 model, but this is US only.

Are there any modifications that make the 86 better than the 85 model (here in EU they are very rare!)?

Are there any other weak points you really have to look after (except what you would expect from an over 30 year old bike).