Just have to be capable of diagnosis on a motorcycle and fix the issue. I have bikes over 60 years old that run strong. There are guys with bikes like yours that are older with way more miles that run fine. Stabbing at a problem and throwing parts at it is frustrating and often fruitless. My Speedmaster will probably still be running strong when I pass on.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!