S4 full throttle surging - any ideas???

[Dedko]

My S4 is surging and suffocating under full throttle and bike wont accelerate...noticeable on higher gears 5,6 (maybe 4 too). But under different throttle bike seems to be ok and accelerate...i dont know what can cause this.

Have anyone some idea about this? Cheers Filip

[wolf!?]

sounds lean. when's the last time u changed the fuel filter?
have you opened the airbox and changed the pipe without adjusting the trim pots?
do you have intake or exhaust leaks?
any popping on decelleration?

[ducmon]

+1 fuel filter