hello. 
have dt 125 that runs rich,dropped to #110 main jet 
have #7 ngk sparkplug 
jet needle at leanest clip setting #4j13  will a leaner jet needle fix it? 
use 32:1 oil/gas ratio 
air screw 2 turns out 
k&n filter clean 
is the crank seal letting transmission oil to cylinder ? ...i plugged 
off oil injector. 
 
any thought to this issue would be helpful 
 
thank you:: 
learaway