Expert? Ha! Thanks 2bros, but I'm just filling in til the real riders show up.
As far as your fork seals and wheelies go...good luck.
OP, from the sound of your post it seems like you're doing power wheelies only(no disrespect at all, and correct me if I'm wrong).
You're hard on the throttle, wheel up, and it's up til you run out of gear/rpm, or road. Correct?
Then the front drops and you shift, then maybe repeat in 2nd or 3rd?
If so, it is what it is. Your fork seals will never last like that.
If you want to wheelie and get some fork seal life, you must learn to set the bike down easy; but to do that, you need to learn to ride a balanced wheelie. Meaning, you get the front up and keep it there as long as you want.
If you can do that, then you can set the front down easier than a regular power wheelie.
After you're done with your balanced wheelie, you ease out of the the throttle and lower the front back down slowly. As the wheel gets really close to road, get back in the throttle. At this point it'll be too late to pull the front back up, but it'll make the touchdown very soft.
Depending on tire, temp, and road, sometimes you get a tire screech and/or puff of smoke, like a plane landing.
Keep in mind too that you need some room to do this, even if you were doing a slow wheelie. Considering how fast a Busa(and most sportbikes) accelerate.
Easing back to the ground like this is much more forgiving on fork seals than just cutting or running out of power, and dropping the front with a thud. Which usually involves bottoming the suspension.
Even with the way I just stated, the seals still take some abuse, nothing is foolproof; but they will last a lot longer.
I've been riding, wrenching and wheelieing for around 25 years now(I'm 36)....and how and why do you think I learned to replace fork seals?
Gotta pay to play, nothin's free.
It aslo seems to be the consensus here that OEM Suzuki seals are the only way to go, and that's all I've ever used.
If you have stands and tools, around $100 will cover seals and oil.
5w oil is stock, and you can use 7w, 10w, or even mix it.
I'm 173 lbs and add roughly 20lbs of leathers and helmet. I switched to 7w oil in my gen2 forks(yep, had a damp seal).
The 7w was just something I tried and liked in the Busa, a preference only. To me it made the front feel a little firmer and better suited to a big heavy bike. The 5w gave it kind of a flimsy feel to me. I think more so I could've made use of an upgraded suspension, but at my weight and only being a street rider, there was no real need for it.
All this being said, make sure you've set your suspension sag for YOUR body weight, with YOU on the bike. With gear on too, and if you don't have any, it's money well spent. I'll be the first to go cruise in a t-shirt and shorts(and always a helmet), but always full gear for anything else. Yes, it doesn't make that much sense, because you can crash or get run over anywhere at any speed; but that's life.
Twobrothers has a great "how to" for fork seals, check it out.
As for the wheelies...Practice!