I have scanned through most of the posts in an attempt to find tips for solving this problem. My son recently purchased a '91 225 Ocean Runner, 25" shaft, with a pretty new Morse top mount control. When he got it, the engine had to be shifted into Reverse to engage Fwd gear. After checking the prop against my '94 200 rude (which is counter rotating) we determined he had wrong prop. Put correct prop on and seemed fine. Next trip, just after getting on plane the engine reved to max and lost propulsion. It would no longer shift into FWD but would shift into REV. He was told his LU was toast. Bought a used one and it did EXACTLY the same thing. We dropped the LU, adjusted the shift rod to 26 15/16". On the trlr we can turn prop and shift into both gears with the control. But when it is running, it will not shift into either gear.
An added note, when we tried to shift it while running, the engine rpm didn't change at all as we moved out of neutral. Can a faulty shift switch be preventing it from shifting into gear? Finally, when reattaching the shift rod, I noticed the block the shift rod fits into had a lot of play in it. It was tight on the shaft but I could rotate it 3/8" quite easily. I subsequently checked the arm where the shift cable attaches and it has a lot of play too.
I am considering the prospect of putting my known good LU on his engine as a test, but don't know whether this is a good idea. This site has helped me get my 'Rude in great shape so I am hoping to find some help for him. Any assistance or ideas you all can give me would be quite helpful. Thank you in advance.
An added note, when we tried to shift it while running, the engine rpm didn't change at all as we moved out of neutral. Can a faulty shift switch be preventing it from shifting into gear? Finally, when reattaching the shift rod, I noticed the block the shift rod fits into had a lot of play in it. It was tight on the shaft but I could rotate it 3/8" quite easily. I subsequently checked the arm where the shift cable attaches and it has a lot of play too.
I am considering the prospect of putting my known good LU on his engine as a test, but don't know whether this is a good idea. This site has helped me get my 'Rude in great shape so I am hoping to find some help for him. Any assistance or ideas you all can give me would be quite helpful. Thank you in advance.

