Took my expansion chamber off last week when I was going to switch everything to a different bike but ended up staying with what I know works. Came outside the next day and saw some milky oil coming out and decided to drain it all then clean it with carb cleaner. Like the post says is this normal for oil to collect in the expansion chamber or am I running too much oil. I was at 20:1 in the pic and just backed down to 25:1 this week. Thinking about backing down more to 32:1. Also I live in Michigan which is getting pretty cold around 40+- degrees F.