1998 Suzuki 150 2 stroke. Ran fine for a while the other day in all gears, went to back away from a dock and reverse wouldn't engage, only clicked. After one or two more attempts it wouldn't make any noise in reverse and then I had to go through neutral into reverse to take the boat out of gear. Took all the linkages off and I can now get it to lock into forward and neutral. If I lift and hold the shift rod I can hear the lower unit clicking and trying to engage but it won't and as soon as I let go of the rod it falls back into neutral. Any ideas before I take it to the shop?