Back in my early days of riding I had a 175cc Bultaco Campera and a 125cc Kawasaki KS 125. Both were terrific bikes for the deep woods. They barely weighed 200 ;bs so were easy to pick up and manuever plus had enough power to do the job, although their suspension was primitive by today's standard.
. There are some small 4 strokes on the market these days in the 250cc and under range will work but most of them are pushing 300 lbs without any gear on them. I miss the small street legal 2 strokes.