I just changed from a 05 carb to an fcr. For some reason if the hot hotstart is screwed in the hole on the carb it wont start. I can hold in the hotstart and it will start right up. I can get it to purr with it unscrewed and as soon as i put the plunger in the hole it it kills the bike instantly. I know my jetting is off but it runs great and starts on first kick every time with it out.What is causing this?