Ok just finished up doing some cosmetic work on an GSXR put it back together and *it will start with the choke on(not without) *it will not idle above 4k rmp if u try it dies. *playin with the idle switch didnt do much. *Engine oil is only about 2 months old althou it was been sitting for those 2 months. *Fuel is brand new. *We did take to fuel tank of to tou7ch it up but i highly doubt we put it back incorrectly Sounds like a carb problem to me my guess would be we got some forign matter in the fuel line and it fcuked the needles up. But i dont have the guts to take apart a 4 cyclinder carb. Any thing else i can try. im fairly mechanicly able at least on my other bikes but the engine on the gsxr just look to big and complicated for me to fcuk with.