The right angle MC 182AMC from CC Speciality is the tool for porting 2 stroke cylinders, it can reach up into the upper transfers with ease even on 40 cc cylinders. It uses 1/8" dia shaft bits which are plentiful from many sources, CC also sells an array of porting bits, a bit spendy but you get what you pay for. They have two videos showing a 182 in use on Youutube.
Good info thanks!!
We won't tell robin.....shhhh