What could cause this issue? I can shift up from 1st to 2nd then to 3rd ok, 3rd to 4th is hard to get into and 4th to 5th seams fine. But when down shifting, 5th to 4th to 3rd is ok, cannot not get it to go into 2nd and 1st unless I shut the machine off and rock it back and forth and play with the shifter. Even when the machine is off, I can up shift to 3rd fine and have the same issues. Any suggestions? Thx in Advance.