The choke is usually needed to help it run when cold. You can see if it will start ok without it, but you will have to most likely completely take it off or it will stay closed all the time. You should also be able to slow the fast idle speed down a little bit. I would suggest you leave it on there, I'm running mine without the choke hooked up but it can be a real pain to start for the first time and it hasnt even gotten that cold yet.