I recently rebuilt a honda cm450e and replace the old stuck choke cable with a new pull cable that works great. Only thing is the choke pull won't stay out when cold starting. It wants to spring back into the close choke position. I did recently rebuild the carb including rejetting to a cone air filter setup. My first thought is the spring that connects the choke cable to the carb is out of adjustment some how constantly pulling the choke in. I have checked this and it seems good at first sight. Also seems like the carb wants to suck the choke in perhaps via a vacuum effect. Is it possible to adjust the carb so that the choke won't stay out on cold start? Perhaps someone with more knowledge than I do can explain what the dynamics in play are here?