Good luck. Not to burst your bubble, but a $65 okuma spinner will blow up on the first fish. In fact, I don't think it could withstand the initial run of a decent size YF. Since you already own it, might as well give it a try. I'm a gambling man, and would like to place a bet on this reel getting a tuna to the gaff. Any takers?
Don't waste your money on a Penn 9500 either. They just aren't designed to handle YF's. It might bring in one or two before it explodes on you. If you don't fish for tuna very often, see if you can borrow a reel from somebody. You might want to consider a conventional reel. If you don't want to spend 600+ on a good spinning reel, just buy a Penn senator. It won't cost much and should do the job.
Don't waste your money on a Penn 9500 either. They just aren't designed to handle YF's. It might bring in one or two before it explodes on you. If you don't fish for tuna very often, see if you can borrow a reel from somebody. You might want to consider a conventional reel. If you don't want to spend 600+ on a good spinning reel, just buy a Penn senator. It won't cost much and should do the job.