Suzuki12's 2005 Suzuki Other Suzuki

I've gotta 2005 Suzuki Z400 that I race motocross with.
I'm running out of things I can do to improve it so if anyone has any ideas please share. here is a list of things I have already done to it.

-440 kit
-full Powerbomb exhaust
-FMF stage 2 silencer
-Alba racing carberator
-Sprocket change out, 1 tooth down on front 2 up on back
-flipped the front tires to output them and give a wider turning radius for better/much faster turns
-50/50 93octane and Cam 2
-Twin Air filter