I have a bicycle frame that says dyno gt S7FY02885, I need to know as much information as possible my records, to verify it's not stolen & to hopefully register it

No way to tell from serial number, and if it's repainted (no model decals left) then it's worth is determined by equipment, appearance and mechanical condition.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

I don't think there is an answer to your problem because Murray didn't publish a data base of the manufacture date. The best chance is either local bike shop or an internet search under vintage bikes

Sorry, comprehensive databases for bicycle serial numbers do not exist.

The GT web site provides little or no information (gtbicyclkes.com). The best solution is to go to site and in lower left corner, use the "find a dealer" search. contact him for needed information

go to bmxmuseum .com fro assistance

try gtbicycles.com or bmxmusuem.com

Yes from gtbicycles.com

If it is when you pedal, check the bottom bracket (where the cranks are attached) The bearings might need changing which would cause the noise.

Do the handlebars rock back and forward, if so, check and tightent the headset, check the bearings inside if they are dry or broken, replace and re-grease.

start with the seatpost itself, most of them have the size stamped on them below the minimum insertion hash marks. It is almost always measured in metric, millimeters usually, like: 25.4mm (which is 1 inch).

If the size is not stamped on the seatpost (it was most likely cut off or scratched beyond recognition) then you can measure the diameter in inches, multiply by 2.54 to get the metric measurement in centimeters, multiply that by .10 to get millimeters and then call your local bike shop for a replacement.

Dyno bikes are made by GT, it was there "budget" brand of BMX bikes, so you can google GT bikes and find a local dealer or you may be able to order direct from GT. From the year of your model, most likely the bike is steel (cro-moly or hi-ten) and these bikes normally have a smaller seatpost size, like the above mentioned 25.4mm. Aluminum frames usually have larger diameter tubes with thinner wall thickness and will require a larger diameter seatpost.

Under the bottom bracket, it may be partly hidden by the cable routing