creakin can be a lot of things ....
First..lets clean the bike and make sure no dirt is anywhere than :

I would start with the hinge... it needs to be tight not overly tight but if you press it with your hand there should be some red left when u look at your palm ... I know this is very ..lol .. but usually works

2. look at the foldeing handlepost ... grease the contact areas ... adjust tension if necessary

3. Seatpost ... make sure NO grease is contacting the actual seatpost ... You can put a dab of grease in between the sleeve and the frame


4. Cam part of the seatpost quickrelease.. dab of grease than open and close 5 times, re adjust


5. Seatpost to seat bolt ... tighten


6 Cam on the adjustable handlepost and cam on the Handlebar clamp .. grease... than tighten


7. bring it to Olney ( Illinois) and I fix it .... we are much more Nycer than most folks in Noo Yawk ... albeit a little out of the way ..:-)

thor