Did you make sure and get the diaphram lined up and not pinched? This is a common problem with the CV carb and it's hard to get it back together. See if the needle travels
without binding. Also the membrane could have a hole in it but I bet it's just not traveling free. I'm talking about the one on the top of the carb under the cover, not the one on the accel. pump.
Can't get faster than that Glider, he's on it!