Correct me if I'm wrong, but the repair manual for my 190 states that there is no need to lubricate the throttle cable because of the way it's made. On another note WD40 IS NOT A LUBRICANT! It works as a lubricant for 15 Minutes, it only displaces water to eliminate squeaks and loosen rusted parts, PLEASE DO NOT THINK THAT IT LUBRICATES! Get something decent for lubrication. So unless the throttle cables are different on your 400E there should be no need to lube it at all, and you mentioned it was fine anyway, temperature could be a part of this problem, my 190 had a problem starting in very low temperatures, but it did start on the second try every time.