The draw bar on these engines kinks the edge of the carb neck a bit. I had a hard time getting my carb off when I took the pics in the other thread I linked to earlier. I loosen the screw and try pushing on the draw bar screw itself to push the back end of the draw bar away from the carb neck. After doing this, I was able to get the carb to wiggle a little and get it free. The two-piece draw bars dont need to be super tight to hold the carb in. If its got a lot of castor sludge around the base of the carb, try heating it up good and hot with a hair dryer or heat gun after knocking the draw bar loose.

Here's my running .65