The revflow was designed as an improvement to the posa. It refined some of the poor areas that the posa just could not do right, like the mixture control and positive fuel shutoff. As Steve said, for some of us, the needle still did not cover all the range of performance. I also custom carved a needle to meet my needs. Unlike the posa, at least this could be done, with a good chance of success. Joe at Revmaster will work with you and even custom cut a needle for you if necessary. I like the carb and will continue it's use.
Orma Southfield, MI N110LR Tweety, old enough to drink this year Flying and more flying, to the gathering or bust http://www.kr-2.aviation-mechanics.com/
