mix 25:1 start, throw a good tune on it, and run it like you stole it, just dont hold it wide open for more than 10 to 15 Seconds for the first 1/2 tank or so.
you need to create a fair amount of case pressure to push the ring into the cylinder wall to help Seat it. to create enough case pressure, you have to get around 3/4s throatle and up. running at slow low rpms will help create blowby around the ring, which means lost compression, which means poor performance.