Correct . Colder ambient temps means colder running temps even with a lean mixture... of corse the cold air just cools the motor better. Never run a motor colder than 200 degrees... colder temps means less cylinder expansion which results in more engine wear. Never run these motors over 260 degrees because everytime you overheat them the sleve doesn't shrink back quite as far as it once did when cold (thats also why you have a harder time getting a sleve out of an overheated motor as compaired to a motor thats been ran correctly).