This carb offers a serious performance increase over many stock carburetors: better (more direct) throttle response and more power over the entire rpm range.
Details:
Mikuni TM40-6 flatslide racing carburetor
with choke (remote choke or direct pull)
with accelerator pump
accelerator pump can be completely set (squirt start, end and duration)
with external fuel screw (for easy pilot circuit tuning)
with vacuum connection.