It was the whole story of that old guy so determined to live his dream and not letting anyone or anything stop him, he was fearless, determined, loving, talented, humble, and very likeable. Every part in the movie where he ran up against an obstacle and then overcame it brought a tear, and when he beat the record, after all the trouble he went through, whoa, kleenex time.
I am also a motorcyclist and could identify. I have taken my bike up to 130mph so had some idea of the courage it took for him to take that wobbly contraption to 200.
Bert Munro is one of my heroes and I will soon have a poster of him and his bike on my wall. At 56 myself I am no starry eyed kid either, I just have THAT much respect for him.
I can understand now why the movie makes you get choked up. You sound like a pretty special guy yourself!