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Dave-I just got done rebuilding one of these carbs also , same year and HP. I was Very Careful not to over tighten anything. I had looked at the cost of the parts, holy cow be gentle came to mind ..repeatedly.
I like Dan’s idea of the tywrap scrap to fill the stripped out threads. I would probably use the very tip of the end, which is thinner than the center section and will work just fine. There is not a lot of stress or tension on that screw that holds the cam roller on. Being a shouldered screw,It is a looses fit when tightened ,in order for the roller to move. I believe the later years had a stud that the roller fit on instead of a screw.
I have another one of these ’89’s,a 9.9 Johnson to rebuild the carb on…looking forward to that. 🙂
Jim PSB
"Some people want to know how a watch works, others just want to know what time it is"
Robbie Robertson