I recently had to tear down the carbs on our 2000 Tourer. The low speed jets were clogged on two of the carbs. I took the opportunity to replace all the low speed and main jets. This is the first time I've had to do some real serious wrenching on the bikes.
On the left bank I found after pulling the vacuum sliders there was about half an ounce of oil in the throat of the carb that was causing the slider to stick. (see the pic) Does anybody have a clue how that oil got there?
I would have expected to find oil in the air box if oil was coming up through the crank case breather. Not the case. There was a really small film of oil in the air box from the K&N filter. But K&N filter oil is red and the oil in the carbs looked like engine oil, clean and fresh.
So... Anybody got a clue as to where this oil may have come form?

Thanks!