G'day guys,
I've just been out in the garage and I ran my CA18 for about 5 mins, giving it a bit of a rev and what not. Anyway afterwards I noticed a large wet sort of steamy mark on the garage floor under the dump tip of the exhaust(It points at the ground). It seems a fair bit of moisture is coming out in the exhaust. Does this sound like a headgasket? I sincerely hope not but I don't know any history of the engine what so ever.

I just thought I'd add that the engine is rough when cold but runs well when warm.