It's mechanical secondaries. Alright guys here's the scoop. I looked at the carb and everything today. The linkage is fine. I noticed that when the engine was off the throttle stuck a bit and did not go back all the way, it was just more noticeable when the engine was on. I took the carb off and it is not hitting the gaskets. It just happens right at the very beginning of opening and the end of closing, so I looked closely at the primary throttle plates of both my old 750 and my new 650. The 650, the one that is sticking, has a throttle plate that is a little more shut than the other plate. It looks like it may be hitting the body as it shuts. When I manually open the throttle and let it shut it hesitates to close all the way at the end but I do not know why this would worsen or seem like it is worse when the car is on, it could be the vacuum from the engine, I don't know.