Hello,

I need any photos how to install racing tail to my cbr f3. I think I need any rack because there is big gap between seat and frame. Could I use my original seat ?

I have this tail:

 

What I would do is.......................Line the front part with the petcock/tank/etc. Then compare the rear to where the stock stuff was, when mounted. Once I had it all lined up with duct tape/zip ties etc holding it firmly in place, then make some homemade brackets to hold it in place. I have a solo tail that uses the stock seat that I mounted and use, but I also have one like yours for my F2 that I have trial fitted and it looks to me it would need some support underneath where you sit/weighted most. If I lined it up with the tank/petcock etc, there was a space between the seat and frame.