I just rebuilt the engine and now it idles at 3000. I don't know how to tune these carbs. I know car carbs but dont know where the idle screw is. I if someone can give me a run down on tuneing these or point towards a good guide. Also the engine idle changes as the throtle cable moves. i pulled it off the thumb trigger and tried pushing it all the way in and it wont go below 3000. maybe i need to disconect thtm from the carbs also and re run them or something any help thanks in advanced.