It maybe my age but I never could understand why so many want to transform this bike into something that it was never meant to be. In the woods and on the trail, the bike has power right where you want it with no hit, it has endless torque.
Going bigger on the carb will yield more power but will have less torque which is better for the track but not always the trail. The 220 has a large sweet spot for off road but will never be a track bike w/o major suspension/ engine mods. Remove the airbox lid, maybe experiment with your sprockets a little, Jet it, pipe it and forget it , depending on your wgt you may want stiffer fork springs. I know it is natural to want to tweak things but this is still probably one of the best bikes( even stock) for it is intended purpose of off road, woods etc. Ride it for what it is and it will keep you smiling.