a lot of it goes to gearing too. If you are geared low, it will tend to pull the front up more. If you are tall, you could get away with a shorter swingarm and not much wheelie. Also have to think about wheel spin, traction, gearing, speed, etc. I rode a stock stroke cub that had a +4 swinger and it would pull the front up a little bit even in 3rd and 4th gear with 14x39 gearing and 22" paddles.
My bike with just the mods in my sig will wheelie a lot if I let it. Even in 4th gear 14x40 gearing if I give it a little tug and some gas, I can pull it up. It's not easy, but I can get it up. In 1st 2nd and 3rd it will come up without any tugging at all, just a slip of the clutch and some gas.... It depends on traction though. on a gravel road, it will just spin like a mofo, if I am on the hay fields just after we irrigate them and the ground is soft, it will grab like crazy.
Depends on a lot of stuff.