The clutch could be slipping when it hits the power band. When you're on the wheelie, the clutch start to slip until it hits redline & drops. My racebike did that. It pulled hard until 8K rpm, then the clutch slipped after that. Also, did you loosen anything else while you made your exhaust changes. You could have loosened something; maybe the tilt sensor is loose or faulty.

 

i dont know speed, im gonna try and get to the bottom of it today hopefully. it doesnt seem like the clutch is slipping though. [>:]

 

update on my FI problem/rpm/powerloss/lack of wheelie problem, mine wasnt fuel injection at all.. well sort of but it was the power commander. my buddy and i yanked it at his shop and booya, bike back to normal. so dynojet is sending me a new one and im going to custom map it on the dyno. bling bling
so now the bike redlines and the rev limiter kicks in but it doesnt kick the tach back to half power like it was. it stays up there like it should now. my wheelie power has returned.

 

was the clutch still slippin like everyone suggested tho? and thats great for you, im thinkin about getting a car now that i dont have my daily driver for a while (2 months) gotta see what i can do about getting a car tho, 19 years old they laugh at me at any dealership haha, hopefully mines gets fixed soon to

 

nah clutch is fine. it doesnt slip. check the other post, i just asked you about your ride.