Hello, I have the following problem: #undzwar with my ktm 125 exc bj. 2009 always breaks the spark plug again and again. If it is turned out then it is black, wet…. In my opinion it is much too fat set. I have the air control screw as original on 2.5 revolutions. I tried with more revolutions so leaner, and the main nozzle reduced to 168, hopelessly…. I ask for your help. Many say hello.