I have had an evolution 35 and a 45 and both came with an automatic choke. Never used that feature. I always soldered the little hole on the choke plate closed then mounted a manual rod to run forward to the front of the cowl so that I could manually engage it. Flip it a few times to get fuel in the carb and then a bump of the throttle and it will disengage. Soldering the hole shut helps it draw fuel that much better. Both my evolutions were great running and easy starting.