I used to live in Bellingham,Wa and I remember the long winters and the engine break ins in the cold weather, well if its too cold like in the low 50's, dont even try to get out in the cold you are going to end up leaning your engine too much and that will be the end of it, there is nothing wrong on waiting till you get a warmer day at least 65f or try it in your well ventilated garage!! dont rush it,
fernando