My daughters 300ex will not idle.i took carb off and soaked it in carb cleaner overnight and then cleaned jets and carb with carb spray cleaner. Put it all back together and still same thing.i feel that it needs to be adjusted but don't have Manuel any info as to where adjustment screw is and how many turns out screw needs will be greatly appreciated and any other suggestions.it also spits n sputters if I give it full throttle and acts like its gonna die.as soon as I let off throttle it goes dead