cr125 bog again

it sounds like overheating to me because a topend bog which this has happen with a lot of snowmbiles I had they bog in the higher rpms and it feels like your hitting the killswitch,or your jetting is rich I would clean your carb check everything over good
 
jetting dude... your to rich on the mian jet.. its that time of year.. tempatures going up... main jets go down... lol ..

if you jetted your bike for the colder weather, your to rich as it gets warmer.. drop a main or two and i bet it runs great again