Little advice needed.

Big DUHHHHHHHH! Simple fix. When we put the carb back on we didn't put a return spring back on the rod and it was floppy. Put a new spring on and it shifts smooth at the right speeds. I originally went to shorten up the rod as suggested and realized it was the solid style, not adjustable, so the spring missing just jumped out at me. Feel like a goof but I'm real happy it was a cheap and easy fix. Thanks for the help.