As I recall, one of the vendor sites has instructions on how to adjust choke. With cold engine, depressing the gas pedal 1" or so should release choke linkage so spring shuts choke plates. AS engine warms up, spring unwinds (with water or electric heat help) and plates open to full vertical. So under the hood, move throttle linkage ans see if plates snap closed. Unless someone has been messing with choke housing, hard to imagine how this would get way out of adjustment. However, to adjust, loosen three bolts on housing and turn it so plates are just closed. Make sure linkage is not binding.