I have a 1996 gsxr 750 it has spark and wont start

Try some aero start, starting spray, it may help work out what may be wrong.
Try a compression test
drain the carby bowls.though the little drain screws
Did it stop for any reason or it just wont start after it has sat for a time.?
What have you tried?

If your gas is more than 30 days old I would drain it and fill up with good gas like chevron or shell. You might also try bump starting the bike in 3rd gear while sitting on bike. Dont try to bump start running next to bike... trust me!
Gasoline slowly turns into water in a sitting bike. You can try pouring a whole bottle of isopropyl alcohol in a tank over half full of old gas.
This from wiki:
"Isopropyl alcohol is a major ingredient in "gas dryer" fuel additives. In significant quantities, water is a problem in fuel tanks, as it separates from the gasoline, and can freeze in the supply lines at cold temperatures. It does not remove water from gasoline; rather, the alcohol solubilizes water in gasoline. Once soluble, water does not pose the same risk as insoluble water, as it will no longer accumulate in the supply lines and freeze.

Im having the same problem theres compression but no spark how can i find out whats wron