Thank you very much for your reply sir. I’m sorry for the lack of information. To add more specific details:

-Yes I’m wondering what would be the recommended RPM to run this 2.6 XP engine at. I know there’s a an originally published range but it seems most 2 stroke outboards with experience have been recommended to be run higher.
-My specific engine is an original low hour unmodified Evinrude 2.6 XP, 1984. These engines had no power rating but were based on the 235 hp engine, just guessing maybe 250?? It’s on a 1984 Checkmate Sportfire, very small, 16 ft, custom ordered package, boat rated for a max of 140hp. Original receipts and manuals.

Hope that helps!