got some issues allready checked the fuel filter now what? bike runs fine under 40 after 40 it acts like its running outta fuel, starts jerking when i twist the old throttle.what can this be?????? fuel pump??????????????

 

not enough info johnny if you are sf you might have to restrict your air box a little

 

sf?????????? it has the dual ram air and the filter is in. ill explain more, it runs good up till i hit 4 the gear i can 12000 rev it in the first 3 then it starts cutting out , it wont just cruise it starts jerking and it wont rev up and if i pull in the clutch it dies. so how would i restrict the air box????????? and what is sf mean????????????????