Just picked up a 2000 zx600 needing some work. Heres the weird thing, it starts and revs high ONLY on choke. Turning choke off ANY time instantly kills the motor gas or no gas no way around it. Just touching the choke a HAIR same thing. I am stumped. The carbs seemed clean when I ripped them down tonight. But I have a feeling it may repea despite blowing them out. Any ideas? Usually if choke runs it it will SOMEWHAT run with it off or half on etc.