You might be able to turn that oiler up to max flow if you take a little punch and small hammer and lightly tap on the valve stop next to the flow adjustment screw on the bottom of the saw. You will then be able to turn the adjustment screw even further. Thus opening the oil valve further. It will then burn a full tank of oil to a full tank of gas. I know it can be done on a 661, because I opened mine up all the way by doing that and it works great! There is a "You Tube" video on instructions showing how to do it. However this adjustment is irreversible, so you won't be able to turn it back down, but I've never seen a reason to turn it back down. I want my oilers pumping max flow! That's just what I prefer though. To each his own!
Cut safe, stay sharp, and be aware!