Irish, when I first got my70, I ran about three tanks through it for break in. Then when I was ready for the first flight, I couldn't get the engine to run well at all. At one point I was seriously thinking of doing a little hammer adjustment to it. Following the suggestions from the guys at the field, only made things worse. I ran across a couple post suggesting the method I described and what a difference. That carb seems to have a differnt mind for inital adjustment than either the 52 or 91 and I have both. Let us know how it works out.

Don