Re: Where does this part go?
Yes it should be there. It prevents the tank from coming in contact with metal, which will eventually damage the tank with all the vibrations. They just pop in/out. It happens from time to time. Could have gotten partially popped out last time the tank was up. Just remove the nut at the top of the tank right behind the top triple clamp, and the tank will pivot up. These bikes come with a little prop rod to hold the tank and with its age, it is likely missing. Find something to prop the tank open with and wiggle the plug back into place.
5 minute job. Worth the time.
2007 GSXR 750
PC III, Quick Shift, Yosh TRC-d Full System