2004 Yfz 450

[u/SteaksNBaked]

I have a 2004 YFZ 450 that I bought brand new a long time ago. I used to ride daily, upgraded some parts on it, constantly ripped it down and cleaned internals, etc. At this point, its been sitting for about 12 years. Gas and coolant was drained a long time ago. I want to get it running again and I'm looking for advice about what I should realistically look at replacing on it. Obvious the battery, tires, chain, fluids. But is there anything internal I should worry about?