I'd consider how the bike was ridden (especially the last time it was used). If it was used mainly for short trips and/or during especially humid/damp weather, then I'd change it (or ride it for a good while on the freeway/highway). Changing the oil would also put you in good shape if the bike sits longer than you planned (and you'd be rid of the wear metal that nipplesurfer mentions)
Btw, while you're at it, top the fuel tank to 3/4 or 4/5ths full and consider using a fuel stabilizer (ask your HD dealer about this). I'm sure that you know all about this, but thought I'd mention it anyway.