Wasting my money?

[Ganboy70]

Is it worth running some carb clean up in it...had the carbs sync'd and cleaned, made a world of difference already.

Was that a question?  If your carbs have been properly removed and cleaned, gas tank isn't rusted, fresh fuel filter, etc. etc. already then run some Seafoam through your tank every season to help maintain things, good luck, don't over-think it and enjoy the rest of our short Ontario riding season!

[Dan Filetti]

My Gixxer, which comes from the factory with advanced timing, requires at least 90 octane -says so right on the tank.

Double check that.  They may say it requires a motor octane of 90, or a research octane of 90.  Not the same as the numbers on a US gas pump. 

Seems fairly explicit: