Have noticed the last few times I've washed my Kwaka KL250 that there is a small amount of oil leaking thru from the headgasket. It's really nothing major. Just kind of forms a light film, wipe it off with your finger and there's hardly anything there. It seems to be coming from across the front section of the head, nowhere around towards the back of the engine. BUT, should I go stuffing around trying to tighten things up to sort it? Or just wipe it clean befrore I sell it!! Thanks in advance. bell