1984 big red 200 es hi/lo

I just picked up a 1984 big red 200 es today. It runs pretty decent but the biggest issue I have is going up hills it bogs down quitell a bit. I adjusted the carb a little and it slightly helped. I put it in low and it goes a little better.
Am I hurting anything driving all the time in low range, or how should I be using the hi lo? Or am I totally missing something