011 fuel mix in oil tank

[promechanic]

I have an old 011 that doesn't see much use except occasional limbing or brush cutting a couple times a year. If the saw sits for more than a day or two with fuel in it, the fuel mix ends up in the oil tank. Is there anything besides the case seal that could cause this?

 

[nedsim]

I have an old 011 that doesn't see much use except occasional limbing or brush cutting a couple times a year. If the saw sits for more than a day or two with fuel in it, the fuel mix ends up in the oil tank. Is there anything besides the case seal that could cause this?

I'm looking forward to hearing the feedback here. I experienced the same thing with my 011 AVT recently. It also sees only occasional use, mostly just to give it some run time. Thought perhaps I spaced out and put a bit of fuel in the oil tank, but then I would have expected to find bar oil in the fuel -- nope.