Lumpy performance when pushed

[stormbate]

Hi, I've bought a 1998 SRAD 600 track bike and the performance feels restricted when pushed. It's as if enough fuel isn't getting though and it's getting though in spurts giving a lumpy performance that tends not to go past 100mph. The jets and air filter have been changed by the previous owner who took it to a large tuning performance company. Has anyone else had this or could you point me in any other direction other than the fuel filter, fuel pump and fuel lines?
Thanks

 

[stormbate]

Update

A friend told me to try it with half the air intakes covered. A bit of duct tape and the problem eased massively. The tuning company with a rolling road has failed to get the air flow right!
/CODE]

Hi, I've bought a 1998 SRAD 600 track bike and the performance feels restricted when pushed. It's as if enough fuel isn't getting though and it's getting though in spurts giving a lumpy performance that tends not to go past 100mph. The jets and air filter have been changed by the previous owner who took it to a large tuning performance company. Has anyone else had this or could you point me in any other direction other than the fuel filter, fuel pump and fuel lines?
Thanks