GB,

2 ounces added to a new gallon of fuel shouldn't hurt a thing even if the new gallon was 18% oil. I don't thing you have an "oil problem" at all. If you use a pressure tap off the exhaust and don't place an inline filter between the clunk and the needle valve you run the risk of contaminates from the running engine finding their way into the needle valve and carb. You know when you first break-in an engine they often put out a bunch of trash initially. I'd be more suspicious of that than I would the oil.

Regards,

Clay