Well, I once lived on the 3rd floor and the staircase was rather small and tight. Too tight as I found out when I drove (sic!!!) my BMW R100 up to about the 2nd floor. Then I got stuck... After annoying all the neighbours by giving more throttle (without anything happening other than filling the air with (per?)fumes) I admitted defeat and decided to call in a few mates, with whose assistance we finally succeeded to move the bike manually up into my living room where I then was able to do an engine overhaul.
Side note: my neighbours got upset when I test-started the beast, still in the living room, after reassembly some weeks later (it was about 3am, I have to admit:twisted:). Some mates were helping me to move it downstairs afterwards.
So, my advice: get some assistance to get your bike out, makes things much easier.

