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My 1981 Johnson is model J25RCIM.
Frank,in regards to your comment on the drive shaft, you mean the number of splines on the top and bottom differ with the years? I have not removed the short shaft lower on my motor yet so i will have to do that first before doing any more parts hunting.
I kinda figured this may be a challenge to adapt ANY "looks the same" LU to mine .
I have looked at the ME parts diagrams over the last couple weeks and see that there are several issues to address. A real mind numbing list of succeeding parts #’s for the different needed parts.
I’m sure i will learn something.
Jim PSB
"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson