This, the rear wheel power is probably high 80's. The only way my buddies 97 YZF600R would wheelie when shifting is rolling of then pin it to get a huge weight transfer. Also, 40-50lbs is a huge deal and can be made woses pending where the extra weight is. Will the bike wheelie, Yes Will you look like the guy I saw last friday and yesterday trying like hell to do a standup down the highway and it either does nothing or maybe and inch off the ground, Yes Chances are the bike is fine, you just have to run the piss out of it to get any power.