Quote Originally Posted by lewnor View Post
Replaced the main jet and I still hesitate taking off. I'm sure I need to dial in the air/fuel mix screw, it's starting to get frustrating. Checked the valves and gave the thing a tick, going back in to it when I have time Sunday. http://www.amazon.com/gp/product/B003CJIJ0E the 100 is what I bought, and it seems to be more responsive over 15mph.
The main jet should not affect the low speed hesitation that you are experiencing..

Make sure that your accelerator pump is still working. It's easy to not get it right when replacing the float bowl. When you crank the throttle watch the accelerator pump and make sure it is going down.