by mr_luke » Tue Nov 20, 2012 1:26 am
I seem to recall that I worked out, from the fuel and oil consumption figures given in the manual, that it should deliver about 47:1. I remember being surprised that the oil consumption was actually higher than the recommended premix ratio of 50:1, but I don't think it was as high as 33:1.
Have you checked the oil pump cable adjustment? If you remove the pump cover on the engine, you should see a line scribed on the body of the pump, and one on the semicircular bit the cable attaches to. With the engine running at a fast idle, the two should be lined up.
I don't actually know how much oil my 250 is using. I'm sad enough to have a fuel consumption spreadsheet on my phone, so I ought to include oil consumption as well really!