So i ve been working on my x2 lately and today i pulled the carb off to see what high and low jets i had in the carb.... after talking to carb apart and putting it back together i decided to start it up... upon starting it, it went full rev with out hitting the throttle.... My first thought was no big deal just hit the stop button... when i hit the stop button several times it was still at full throttle and didnt want to shut off... luckily i freaked out and yanked the fuel line off and it shut down seconds later.... needless to say i have some trouble shooting to do now.... But id have to say i was worried the motor was going to blow...