My 1988 force 125 was leaking oil and water was in it so I put a lower unit seal kit in it, things went pretty good until I got to the part where it said not to reuse the crush ring . I didn't have one since I didn't know I was going to run into that problem, so I used the old one anyway could this be my problem? It slips in and out of gear when idling ingear or very low speeds, when I give it more power it is ok.