I can tell you on my B1/KB deal we run .016" hot and if it was cold enough out it would not start cause the valves were open. When I say cold I am talking in the 40's. I really could not set them cold, on first fire up we would set them to .004 and then readjust them hot. When cold it was pretty much impossible to get anything in there but you could wiggle them a bit. On my Predator/World deal we have .006 cold..My other B1/KB deal is at .004 cold.